diff --git a/.azure/azure-pipelines.yml b/.azure/azure-pipelines.yml
index 83221ea0e..46df33d74 100644
--- a/.azure/azure-pipelines.yml
+++ b/.azure/azure-pipelines.yml
@@ -6,7 +6,7 @@ strategy:
     linux-nightly:
       image: ubuntu-16.04
     macos-nightly:
-      image: macos-10.13
+      image: macos-10.14
     windows-nightly:
       image: vs2017-win2016
 
diff --git a/Cargo.lock b/Cargo.lock
index e42b4a127..c23be283b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -186,7 +186,6 @@ version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -229,6 +228,25 @@ dependencies = [
  "chrono 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "chttp"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "chrono 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-channel 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl 0.4.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl-sys 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sluice 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "clap"
 version = "2.33.0"
@@ -332,32 +350,6 @@ dependencies = [
  "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "cookie"
-version = "0.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "cookie_store"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cookie 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "publicsuffix 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.98 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "try_from 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "core-foundation"
 version = "0.6.4"
@@ -412,15 +404,6 @@ dependencies = [
  "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "crossbeam-deque"
-version = "0.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "crossbeam-epoch 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "crossbeam-epoch"
 version = "0.6.1"
@@ -591,6 +574,36 @@ dependencies = [
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "curl"
+version = "0.4.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "curl-sys 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.49 (registry+https://github.com/rust-lang/crates.io-index)",
+ "schannel 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "socket2 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "curl-sys"
+version = "0.4.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libnghttp2-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.49 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "darling"
 version = "0.9.0"
@@ -791,14 +804,6 @@ name = "encoding_index_tests"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "encoding_rs"
-version = "0.8.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "enum-utils"
 version = "0.1.1"
@@ -883,38 +888,11 @@ name = "fnv"
 version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "foreign-types"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "foreign-types-shared"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "fuchsia-cprng"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "fuchsia-zircon"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "futures"
 version = "0.1.28"
@@ -926,7 +904,7 @@ version = "0.1.0-alpha.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures-async-stream-macro 0.1.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -942,73 +920,65 @@ dependencies = [
 
 [[package]]
 name = "futures-channel-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "futures-core-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "futures-cpupool"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "futures-executor-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-util-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "futures-io-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures-channel-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-executor-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-io-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-util-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-executor-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "futures-sink-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "futures-util-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-channel-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-io-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1021,7 +991,7 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1070,20 +1040,11 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "h2"
-version = "0.1.26"
+name = "heck"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "string 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-segmentation 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1110,7 +1071,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "heim-derive 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
  "mach 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1214,7 +1175,7 @@ version = "0.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "heim-common 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heim-derive 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heim-runtime 0.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1231,7 +1192,7 @@ version = "0.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "heim-common 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "threadpool 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1263,22 +1224,6 @@ dependencies = [
  "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "http-body"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "httparse"
-version = "1.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "humantime"
 version = "1.2.0"
@@ -1287,62 +1232,11 @@ dependencies = [
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "hyper"
-version = "0.12.33"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "h2 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "http-body 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "want 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "hyper-tls"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "ident_case"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "idna"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-normalization 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "idna"
 version = "0.2.0"
@@ -1436,6 +1330,14 @@ dependencies = [
  "rayon 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "js-sys"
+version = "0.3.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wasm-bindgen 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "kernel32-sys"
 version = "0.2.2"
@@ -1502,6 +1404,15 @@ dependencies = [
  "pkg-config 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "libnghttp2-sys"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "libz-sys"
 version = "1.0.25"
@@ -1665,51 +1576,6 @@ dependencies = [
  "miniz_oxide 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "mio"
-version = "0.6.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "miow"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "native-tls"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl 0.10.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.49 (registry+https://github.com/rust-lang/crates.io-index)",
- "schannel 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "neso"
 version = "0.5.0"
@@ -1720,17 +1586,7 @@ dependencies = [
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.98 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.98 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "net2"
-version = "0.2.33"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1808,8 +1664,8 @@ dependencies = [
  "dunce 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "enum-utils 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-async-stream 0.1.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures_codec 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "getset 0.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "git2 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1834,7 +1690,6 @@ dependencies = [
  "ptree 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rawkey 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.9.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "roxmltree 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustyline 5.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1845,6 +1700,7 @@ dependencies = [
  "serde_json 1.0.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_yaml 0.8.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "subprocess 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "surf 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "syntect 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sysinfo 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1852,6 +1708,7 @@ dependencies = [
  "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1974,19 +1831,6 @@ dependencies = [
  "pkg-config 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "openssl"
-version = "0.10.24"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.49 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "openssl-probe"
 version = "0.1.2"
@@ -2043,15 +1887,6 @@ dependencies = [
  "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "parking_lot"
-version = "0.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "parking_lot"
 version = "0.9.0"
@@ -2074,18 +1909,6 @@ dependencies = [
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "parking_lot_core"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "parking_lot_core"
 version = "0.6.2"
@@ -2100,11 +1923,6 @@ dependencies = [
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "percent-encoding"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "percent-encoding"
 version = "2.1.0"
@@ -2240,6 +2058,14 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "proc-macro2"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ptree"
 version = "0.2.1"
@@ -2256,18 +2082,6 @@ dependencies = [
  "tint 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "publicsuffix"
-version = "1.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "quick-error"
 version = "1.2.2"
@@ -2281,6 +2095,14 @@ dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "quote"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
 version = "0.5.6"
@@ -2540,39 +2362,6 @@ dependencies = [
  "termcolor 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "reqwest"
-version = "0.9.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "cookie 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cookie_store 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "encoding_rs 0.8.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper-tls 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "mime 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "mime_guess 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.98 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_urlencoded 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "result"
 version = "1.0.0"
@@ -2672,25 +2461,6 @@ name = "scopeguard"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "security-framework"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "security-framework-sys"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "semver"
 version = "0.9.0"
@@ -2807,13 +2577,13 @@ dependencies = [
 
 [[package]]
 name = "serde_urlencoded"
-version = "0.5.5"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.98 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2846,11 +2616,37 @@ name = "slab"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "sluice"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-channel-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "smallvec"
 version = "0.6.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "socket2"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "sourcefile"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "stable_deref_trait"
 version = "1.1.1"
@@ -2870,14 +2666,6 @@ name = "static_assertions"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "string"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "strsim"
 version = "0.7.0"
@@ -2898,6 +2686,27 @@ dependencies = [
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "surf"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "chttp 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime_guess 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.98 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-futures 0.3.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "web-sys 0.3.27 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "syn"
 version = "0.15.43"
@@ -2908,6 +2717,16 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "syn"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "synstructure"
 version = "0.10.2"
@@ -3055,52 +2874,6 @@ dependencies = [
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "tokio"
-version = "0.1.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-current-thread 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -3827,20 +3513,24 @@ dependencies = [
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@@ -3879,7 +3558,6 @@ dependencies = [
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@@ -3889,12 +3567,15 @@ dependencies = [
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@@ -3904,8 +3585,6 @@ dependencies = [
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diff --git a/Cargo.toml b/Cargo.toml
index 1b714461c..51dc6622b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,8 +28,8 @@ chrono-humanize = "0.0.11"
 byte-unit = "3.0.1"
 ordered-float = {version = "1.0.2", features = ["serde"]}
 prettyprint = "0.7.0"
-futures-preview = { version = "=0.3.0-alpha.18", features = ["compat", "io-compat"] }
-futures-sink-preview = "=0.3.0-alpha.18"
+futures-preview = { version = "=0.3.0-alpha.17", features = ["compat", "io-compat"] }
+futures-sink-preview = "=0.3.0-alpha.17"
 futures-async-stream = "0.1.0-alpha.1"
 futures_codec = "0.2.5"
 term = "0.5.2"
@@ -52,7 +52,8 @@ dirs = "2.0.2"
 glob = "0.3.0"
 ctrlc = "3.1.3"
 ptree = "0.2"
-reqwest = "0.9"
+surf = "1.0"
+url = "2.1.0"
 roxmltree = "0.7.0"
 nom5_locate = "0.1.1"
 enum-utils = "0.1.1"
diff --git a/src/commands/classified.rs b/src/commands/classified.rs
index 309af2441..4582d5bee 100644
--- a/src/commands/classified.rs
+++ b/src/commands/classified.rs
@@ -166,7 +166,8 @@ impl InternalCommand {
                                     &full_path,
                                     &location,
                                     Span::unknown(),
-                                )?;
+                                )
+                                .await?;
 
                             if let Some(uuid) = contents_tag.origin {
                                 // If we have loaded something, track its source
diff --git a/src/commands/command.rs b/src/commands/command.rs
index 904a1f03b..b498b5e66 100644
--- a/src/commands/command.rs
+++ b/src/commands/command.rs
@@ -81,7 +81,7 @@ impl CallInfo {
     pub fn process<'de, T: Deserialize<'de>>(
         &self,
         shell_manager: &ShellManager,
-        callback: fn(T, &RunnablePerItemContext) -> Result<VecDeque<ReturnValue>, ShellError>,
+        callback: fn(T, &RunnablePerItemContext) -> Result<OutputStream, ShellError>,
     ) -> Result<RunnablePerItemArgs<T>, ShellError> {
         let mut deserializer = ConfigDeserializer::from_call_info(self.clone());
 
@@ -250,11 +250,11 @@ impl RunnableContext {
 pub struct RunnablePerItemArgs<T> {
     args: T,
     context: RunnablePerItemContext,
-    callback: fn(T, &RunnablePerItemContext) -> Result<VecDeque<ReturnValue>, ShellError>,
+    callback: fn(T, &RunnablePerItemContext) -> Result<OutputStream, ShellError>,
 }
 
 impl<T> RunnablePerItemArgs<T> {
-    pub fn run(self) -> Result<VecDeque<ReturnValue>, ShellError> {
+    pub fn run(self) -> Result<OutputStream, ShellError> {
         (self.callback)(self.args, &self.context)
     }
 }
@@ -485,7 +485,7 @@ pub trait PerItemCommand: Send + Sync {
         registry: &CommandRegistry,
         shell_manager: &ShellManager,
         input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError>;
+    ) -> Result<OutputStream, ShellError>;
 
     fn signature(&self) -> Signature {
         Signature {
@@ -552,7 +552,7 @@ impl Command {
                         .unwrap();
                     match command.run(&call_info, &registry, &raw_args.shell_manager, x) {
                         Ok(o) => o,
-                        Err(e) => VecDeque::from(vec![ReturnValue::Err(e)]),
+                        Err(e) => VecDeque::from(vec![ReturnValue::Err(e)]).to_output_stream(),
                     }
                 })
                 .flatten();
diff --git a/src/commands/cp.rs b/src/commands/cp.rs
index 29e14357a..9ddbc8e4a 100644
--- a/src/commands/cp.rs
+++ b/src/commands/cp.rs
@@ -21,7 +21,7 @@ impl PerItemCommand for Cpy {
         _registry: &CommandRegistry,
         shell_manager: &ShellManager,
         _input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         call_info.process(shell_manager, cp)?.run()
     }
 
@@ -38,10 +38,7 @@ impl PerItemCommand for Cpy {
     }
 }
 
-fn cp(
-    args: CopyArgs,
-    context: &RunnablePerItemContext,
-) -> Result<VecDeque<ReturnValue>, ShellError> {
+fn cp(args: CopyArgs, context: &RunnablePerItemContext) -> Result<OutputStream, ShellError> {
     let shell_manager = context.shell_manager.clone();
     shell_manager.cp(args, context)
 }
diff --git a/src/commands/enter.rs b/src/commands/enter.rs
index 8f92820dd..2e9d0fd01 100644
--- a/src/commands/enter.rs
+++ b/src/commands/enter.rs
@@ -21,7 +21,7 @@ impl PerItemCommand for Enter {
         _registry: &registry::CommandRegistry,
         _shell_manager: &ShellManager,
         _input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         match call_info.args.expect_nth(0)? {
             Tagged {
                 item: Value::Primitive(Primitive::String(location)),
diff --git a/src/commands/mkdir.rs b/src/commands/mkdir.rs
index 56fec8777..895b46b32 100644
--- a/src/commands/mkdir.rs
+++ b/src/commands/mkdir.rs
@@ -18,7 +18,7 @@ impl PerItemCommand for Mkdir {
         _registry: &CommandRegistry,
         shell_manager: &ShellManager,
         _input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         call_info.process(shell_manager, mkdir)?.run()
     }
 
@@ -31,10 +31,7 @@ impl PerItemCommand for Mkdir {
     }
 }
 
-fn mkdir(
-    args: MkdirArgs,
-    context: &RunnablePerItemContext,
-) -> Result<VecDeque<ReturnValue>, ShellError> {
+fn mkdir(args: MkdirArgs, context: &RunnablePerItemContext) -> Result<OutputStream, ShellError> {
     let shell_manager = context.shell_manager.clone();
     shell_manager.mkdir(args, context)
 }
diff --git a/src/commands/mv.rs b/src/commands/mv.rs
index 65616079c..37384e6b3 100644
--- a/src/commands/mv.rs
+++ b/src/commands/mv.rs
@@ -31,15 +31,12 @@ impl PerItemCommand for Move {
         _registry: &CommandRegistry,
         shell_manager: &ShellManager,
         _input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         call_info.process(shell_manager, mv)?.run()
     }
 }
 
-fn mv(
-    args: MoveArgs,
-    context: &RunnablePerItemContext,
-) -> Result<VecDeque<ReturnValue>, ShellError> {
+fn mv(args: MoveArgs, context: &RunnablePerItemContext) -> Result<OutputStream, ShellError> {
     let shell_manager = context.shell_manager.clone();
     shell_manager.mv(args, context)
 }
diff --git a/src/commands/open.rs b/src/commands/open.rs
index a93cdc437..f3df99865 100644
--- a/src/commands/open.rs
+++ b/src/commands/open.rs
@@ -7,6 +7,7 @@ use crate::prelude::*;
 use mime::Mime;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
+use surf::mime;
 use uuid::Uuid;
 pub struct Open;
 
@@ -27,15 +28,12 @@ impl PerItemCommand for Open {
         _registry: &CommandRegistry,
         shell_manager: &ShellManager,
         _input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         run(call_info, shell_manager)
     }
 }
 
-fn run(
-    call_info: &CallInfo,
-    shell_manager: &ShellManager,
-) -> Result<VecDeque<ReturnValue>, ShellError> {
+fn run(call_info: &CallInfo, shell_manager: &ShellManager) -> Result<OutputStream, ShellError> {
     let cwd = PathBuf::from(shell_manager.path());
     let full_path = PathBuf::from(cwd);
 
@@ -46,85 +44,101 @@ fn run(
     {
         file => file,
     };
-
     let path_str = path.as_string()?;
+    let path_span = path.span();
+    let name_span = call_info.name_span;
+    let has_raw = call_info.args.has("raw");
 
-    let (file_extension, contents, contents_tag, span_source) =
-        fetch(&full_path, &path_str, path.span())?;
+    let stream = async_stream_block! {
 
-    let file_extension = if call_info.args.has("raw") {
-        None
-    } else {
-        file_extension
-    };
+        //FIXME: unwraps
 
-    let mut stream = VecDeque::new();
+        let (file_extension, contents, contents_tag, span_source) =
+            fetch(&full_path, &path_str, path_span).await.unwrap();
 
-    if let Some(uuid) = contents_tag.origin {
-        // If we have loaded something, track its source
-        stream.push_back(ReturnSuccess::action(CommandAction::AddSpanSource(
-            uuid,
-            span_source,
-        )))
-    }
+        let file_extension = if has_raw {
+            None
+        } else {
+            file_extension
+        };
 
-    match contents {
-        Value::Primitive(Primitive::String(string)) => {
-            let value = parse_as_value(file_extension, string, contents_tag, call_info.name_span)?;
-
-            match value {
-                Tagged {
-                    item: Value::List(list),
-                    ..
-                } => {
-                    for elem in list {
-                        stream.push_back(ReturnSuccess::value(elem));
-                    }
-                }
-                x => stream.push_back(ReturnSuccess::value(x)),
-            }
+        if let Some(uuid) = contents_tag.origin {
+            // If we have loaded something, track its source
+            yield ReturnSuccess::action(CommandAction::AddSpanSource(
+                uuid,
+                span_source,
+            ));
         }
 
-        other => stream.push_back(ReturnSuccess::value(other.tagged(contents_tag))),
+        match contents {
+            Value::Primitive(Primitive::String(string)) => {
+                let value = parse_as_value(file_extension, string, contents_tag, name_span).unwrap();
+
+                match value {
+                    Tagged {
+                        item: Value::List(list),
+                        ..
+                    } => {
+                        for elem in list {
+                            yield ReturnSuccess::value(elem);
+                        }
+                    }
+                    x => yield ReturnSuccess::value(x),
+                }
+            }
+
+            other => yield ReturnSuccess::value(other.tagged(contents_tag)),
+        };
     };
 
-    Ok(stream)
+    Ok(stream.to_output_stream())
 }
 
-pub fn fetch(
+pub async fn fetch(
     cwd: &PathBuf,
     location: &str,
     span: Span,
 ) -> Result<(Option<String>, Value, Tag, SpanSource), ShellError> {
     let mut cwd = cwd.clone();
     if location.starts_with("http:") || location.starts_with("https:") {
-        let response = reqwest::get(location);
+        let response = surf::get(location).await;
         match response {
             Ok(mut r) => match r.headers().get("content-type") {
                 Some(content_type) => {
-                    let content_type = Mime::from_str(content_type.to_str().unwrap()).unwrap();
+                    let content_type = Mime::from_str(content_type).unwrap();
                     match (content_type.type_(), content_type.subtype()) {
                         (mime::APPLICATION, mime::XML) => Ok((
                             Some("xml".to_string()),
-                            Value::string(r.text().unwrap()),
+                            Value::string(r.body_string().await.map_err(|_| {
+                                ShellError::labeled_error(
+                                    "Could not load text from remote url",
+                                    "could not load",
+                                    span,
+                                )
+                            })?),
                             Tag {
                                 span,
                                 origin: Some(Uuid::new_v4()),
                             },
-                            SpanSource::Url(r.url().to_string()),
+                            SpanSource::Url(location.to_string()),
                         )),
                         (mime::APPLICATION, mime::JSON) => Ok((
                             Some("json".to_string()),
-                            Value::string(r.text().unwrap()),
+                            Value::string(r.body_string().await.map_err(|_| {
+                                ShellError::labeled_error(
+                                    "Could not load text from remote url",
+                                    "could not load",
+                                    span,
+                                )
+                            })?),
                             Tag {
                                 span,
                                 origin: Some(Uuid::new_v4()),
                             },
-                            SpanSource::Url(r.url().to_string()),
+                            SpanSource::Url(location.to_string()),
                         )),
                         (mime::APPLICATION, mime::OCTET_STREAM) => {
-                            let mut buf: Vec<u8> = vec![];
-                            r.copy_to(&mut buf).map_err(|_| {
+                            let buf: Vec<u8> = r.body_bytes().await.map_err(|_| {
                                 ShellError::labeled_error(
                                     "Could not load binary file",
                                     "could not load",
@@ -138,12 +152,11 @@ pub fn fetch(
                                     span,
                                     origin: Some(Uuid::new_v4()),
                                 },
-                                SpanSource::Url(r.url().to_string()),
+                                SpanSource::Url(location.to_string()),
                             ))
                         }
                         (mime::IMAGE, image_ty) => {
-                            let mut buf: Vec<u8> = vec![];
-                            r.copy_to(&mut buf).map_err(|_| {
+                            let buf: Vec<u8> = r.body_bytes().await.map_err(|_| {
                                 ShellError::labeled_error(
                                     "Could not load image file",
                                     "could not load",
@@ -157,21 +170,27 @@ pub fn fetch(
                                     span,
                                     origin: Some(Uuid::new_v4()),
                                 },
-                                SpanSource::Url(r.url().to_string()),
+                                SpanSource::Url(location.to_string()),
                             ))
                         }
                         (mime::TEXT, mime::HTML) => Ok((
                             Some("html".to_string()),
-                            Value::string(r.text().unwrap()),
+                            Value::string(r.body_string().await.map_err(|_| {
+                                ShellError::labeled_error(
+                                    "Could not load text from remote url",
+                                    "could not load",
+                                    span,
+                                )
+                            })?),
                             Tag {
                                 span,
                                 origin: Some(Uuid::new_v4()),
                             },
-                            SpanSource::Url(r.url().to_string()),
+                            SpanSource::Url(location.to_string()),
                         )),
                         (mime::TEXT, mime::PLAIN) => {
-                            let path_extension = r
-                                .url()
+                            let path_extension = url::Url::parse(location)
+                                .unwrap()
                                 .path_segments()
                                 .and_then(|segments| segments.last())
                                 .and_then(|name| if name.is_empty() { None } else { Some(name) })
@@ -183,12 +202,18 @@ pub fn fetch(
 
                             Ok((
                                 path_extension,
-                                Value::string(r.text().unwrap()),
+                                Value::string(r.body_string().await.map_err(|_| {
+                                    ShellError::labeled_error(
+                                        "Could not load text from remote url",
+                                        "could not load",
+                                        span,
+                                    )
+                                })?),
                                 Tag {
                                     span,
                                     origin: Some(Uuid::new_v4()),
                                 },
-                                SpanSource::Url(r.url().to_string()),
+                                SpanSource::Url(location.to_string()),
                             ))
                         }
                         (ty, sub_ty) => Ok((
@@ -201,7 +226,7 @@ pub fn fetch(
                                 span,
                                 origin: Some(Uuid::new_v4()),
                             },
-                            SpanSource::Url(r.url().to_string()),
+                            SpanSource::Url(location.to_string()),
                         )),
                     }
                 }
@@ -212,7 +237,7 @@ pub fn fetch(
                         span,
                         origin: Some(Uuid::new_v4()),
                     },
-                    SpanSource::Url(r.url().to_string()),
+                    SpanSource::Url(location.to_string()),
                 )),
             },
             Err(_) => {
diff --git a/src/commands/rm.rs b/src/commands/rm.rs
index 05c248897..9bbc35287 100644
--- a/src/commands/rm.rs
+++ b/src/commands/rm.rs
@@ -30,15 +30,12 @@ impl PerItemCommand for Remove {
         _registry: &CommandRegistry,
         shell_manager: &ShellManager,
         _input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         call_info.process(shell_manager, rm)?.run()
     }
 }
 
-fn rm(
-    args: RemoveArgs,
-    context: &RunnablePerItemContext,
-) -> Result<VecDeque<ReturnValue>, ShellError> {
+fn rm(args: RemoveArgs, context: &RunnablePerItemContext) -> Result<OutputStream, ShellError> {
     let shell_manager = context.shell_manager.clone();
     shell_manager.rm(args, context)
 }
diff --git a/src/commands/where_.rs b/src/commands/where_.rs
index 442f7ecd3..4be427a4f 100644
--- a/src/commands/where_.rs
+++ b/src/commands/where_.rs
@@ -21,10 +21,10 @@ impl PerItemCommand for Where {
         _registry: &registry::CommandRegistry,
         _shell_manager: &ShellManager,
         input: Tagged<Value>,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let input_clone = input.clone();
         let condition = call_info.args.expect_nth(0)?;
-        match condition {
+        let stream = match condition {
             Tagged {
                 item: Value::Block(block),
                 tag,
@@ -33,23 +33,29 @@ impl PerItemCommand for Where {
                 match result {
                     Ok(v) => {
                         if v.is_true() {
-                            Ok(VecDeque::from(vec![Ok(ReturnSuccess::Value(input_clone))]))
+                            VecDeque::from(vec![Ok(ReturnSuccess::Value(input_clone))])
                         } else {
-                            Ok(VecDeque::new())
+                            VecDeque::new()
                         }
                     }
-                    Err(e) => Err(ShellError::labeled_error(
-                        format!("Could not evaluate ({})", e.to_string()),
-                        "could not evaluate",
-                        tag.span,
-                    )),
+                    Err(e) => {
+                        return Err(ShellError::labeled_error(
+                            format!("Could not evaluate ({})", e.to_string()),
+                            "could not evaluate",
+                            tag.span,
+                        ))
+                    }
                 }
             }
-            Tagged { tag, .. } => Err(ShellError::labeled_error(
-                "Expected a condition",
-                "where needs a condition",
-                tag.span,
-            )),
-        }
+            Tagged { tag, .. } => {
+                return Err(ShellError::labeled_error(
+                    "Expected a condition",
+                    "where needs a condition",
+                    tag.span,
+                ))
+            }
+        };
+
+        Ok(stream.to_output_stream())
     }
 }
diff --git a/src/errors.rs b/src/errors.rs
index 15d2e4500..cd1120dad 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -451,7 +451,6 @@ impl std::convert::From<serde_yaml::Error> for ShellError {
     }
 }
 
-
 impl std::convert::From<toml::ser::Error> for ShellError {
     fn from(input: toml::ser::Error) -> ShellError {
         ProximateShellError::String(StringError {
@@ -482,6 +481,16 @@ impl std::convert::From<regex::Error> for ShellError {
     }
 }
 
+impl std::convert::From<Box<dyn std::error::Error + Send + Sync>> for ShellError {
+    fn from(input: Box<dyn std::error::Error + Send + Sync>) -> ShellError {
+        ProximateShellError::String(StringError {
+            title: format!("{:?}", input),
+            error: Value::nothing(),
+        })
+        .start()
+    }
+}
+
 pub trait ShellErrorUtils<T> {
     fn unwrap_error(self, desc: impl Into<String>) -> Result<T, ShellError>;
 }
diff --git a/src/plugins/textview.rs b/src/plugins/textview.rs
index 99f7cf0b2..7a80c8be3 100644
--- a/src/plugins/textview.rs
+++ b/src/plugins/textview.rs
@@ -308,7 +308,7 @@ fn view_text_value(value: &Tagged<Value>, source_map: &SourceMap) {
                         path.extension().map(|x| x.to_string_lossy().to_string())
                     }
                     SpanSource::Url(url) => {
-                        let url = reqwest::Url::parse(url);
+                        let url = url::Url::parse(url);
                         if let Ok(url) = url {
                             let url = url.clone();
                             if let Some(mut segments) = url.path_segments() {
diff --git a/src/shell/filesystem_shell.rs b/src/shell/filesystem_shell.rs
index 2cbf4d0f4..adeb551fa 100644
--- a/src/shell/filesystem_shell.rs
+++ b/src/shell/filesystem_shell.rs
@@ -221,7 +221,7 @@ impl Shell for FilesystemShell {
         }: CopyArgs,
         name: Span,
         path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let name_span = name;
 
         let mut source = PathBuf::from(path);
@@ -491,7 +491,7 @@ impl Shell for FilesystemShell {
             }
         }
 
-        Ok(VecDeque::new())
+        Ok(OutputStream::empty())
     }
 
     fn mkdir(
@@ -504,7 +504,7 @@ impl Shell for FilesystemShell {
         // }: &RunnablePerItemContext,
         name: Span,
         path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let full_path = PathBuf::from(path);
 
         if directories.len() == 0 {
@@ -534,7 +534,7 @@ impl Shell for FilesystemShell {
             }
         }
 
-        Ok(VecDeque::new())
+        Ok(OutputStream::empty())
     }
 
     fn mv(
@@ -542,7 +542,7 @@ impl Shell for FilesystemShell {
         MoveArgs { src, dst }: MoveArgs,
         name: Span,
         path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let name_span = name;
 
         let mut source = PathBuf::from(path);
@@ -837,7 +837,7 @@ impl Shell for FilesystemShell {
             }
         }
 
-        Ok(VecDeque::new())
+        Ok(OutputStream::empty())
     }
 
     fn rm(
@@ -845,7 +845,7 @@ impl Shell for FilesystemShell {
         RemoveArgs { target, recursive }: RemoveArgs,
         name: Span,
         path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let name_span = name;
 
         if target.item.to_str() == Some(".") || target.item.to_str() == Some("..") {
@@ -941,7 +941,7 @@ impl Shell for FilesystemShell {
             }
         }
 
-        Ok(VecDeque::new())
+        Ok(OutputStream::empty())
     }
 
     fn path(&self) -> String {
diff --git a/src/shell/shell.rs b/src/shell/shell.rs
index 442bb351f..1db76d699 100644
--- a/src/shell/shell.rs
+++ b/src/shell/shell.rs
@@ -12,30 +12,10 @@ pub trait Shell: std::fmt::Debug {
     fn name(&self, source_map: &SourceMap) -> String;
     fn ls(&self, args: EvaluatedWholeStreamCommandArgs) -> Result<OutputStream, ShellError>;
     fn cd(&self, args: EvaluatedWholeStreamCommandArgs) -> Result<OutputStream, ShellError>;
-    fn cp(
-        &self,
-        args: CopyArgs,
-        name: Span,
-        path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError>;
-    fn mkdir(
-        &self,
-        args: MkdirArgs,
-        name: Span,
-        path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError>;
-    fn mv(
-        &self,
-        args: MoveArgs,
-        name: Span,
-        path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError>;
-    fn rm(
-        &self,
-        args: RemoveArgs,
-        name: Span,
-        path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError>;
+    fn cp(&self, args: CopyArgs, name: Span, path: &str) -> Result<OutputStream, ShellError>;
+    fn mkdir(&self, args: MkdirArgs, name: Span, path: &str) -> Result<OutputStream, ShellError>;
+    fn mv(&self, args: MoveArgs, name: Span, path: &str) -> Result<OutputStream, ShellError>;
+    fn rm(&self, args: RemoveArgs, name: Span, path: &str) -> Result<OutputStream, ShellError>;
     fn path(&self) -> String;
     fn set_path(&mut self, path: String);
 
diff --git a/src/shell/shell_manager.rs b/src/shell/shell_manager.rs
index cc10351db..49e8484ee 100644
--- a/src/shell/shell_manager.rs
+++ b/src/shell/shell_manager.rs
@@ -116,7 +116,7 @@ impl ShellManager {
         &self,
         args: CopyArgs,
         context: &RunnablePerItemContext,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let env = self.shells.lock();
 
         match env {
@@ -136,7 +136,7 @@ impl ShellManager {
         &self,
         args: RemoveArgs,
         context: &RunnablePerItemContext,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let env = self.shells.lock();
 
         match env {
@@ -156,7 +156,7 @@ impl ShellManager {
         &self,
         args: MkdirArgs,
         context: &RunnablePerItemContext,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let env = self.shells.lock();
 
         match env {
@@ -176,7 +176,7 @@ impl ShellManager {
         &self,
         args: MoveArgs,
         context: &RunnablePerItemContext,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    ) -> Result<OutputStream, ShellError> {
         let env = self.shells.lock();
 
         match env {
diff --git a/src/shell/value_shell.rs b/src/shell/value_shell.rs
index 62b7de9a1..c65a8833c 100644
--- a/src/shell/value_shell.rs
+++ b/src/shell/value_shell.rs
@@ -103,12 +103,7 @@ impl Shell for ValueShell {
         Ok(stream.into())
     }
 
-    fn cp(
-        &self,
-        _args: CopyArgs,
-        name: Span,
-        _path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    fn cp(&self, _args: CopyArgs, name: Span, _path: &str) -> Result<OutputStream, ShellError> {
         Err(ShellError::labeled_error(
             "cp not currently supported on values",
             "not currently supported",
@@ -116,12 +111,7 @@ impl Shell for ValueShell {
         ))
     }
 
-    fn mv(
-        &self,
-        _args: MoveArgs,
-        name: Span,
-        _path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    fn mv(&self, _args: MoveArgs, name: Span, _path: &str) -> Result<OutputStream, ShellError> {
         Err(ShellError::labeled_error(
             "mv not currently supported on values",
             "not currently supported",
@@ -129,12 +119,7 @@ impl Shell for ValueShell {
         ))
     }
 
-    fn mkdir(
-        &self,
-        _args: MkdirArgs,
-        name: Span,
-        _path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    fn mkdir(&self, _args: MkdirArgs, name: Span, _path: &str) -> Result<OutputStream, ShellError> {
         Err(ShellError::labeled_error(
             "mkdir not currently supported on values",
             "not currently supported",
@@ -142,12 +127,7 @@ impl Shell for ValueShell {
         ))
     }
 
-    fn rm(
-        &self,
-        _args: RemoveArgs,
-        name: Span,
-        _path: &str,
-    ) -> Result<VecDeque<ReturnValue>, ShellError> {
+    fn rm(&self, _args: RemoveArgs, name: Span, _path: &str) -> Result<OutputStream, ShellError> {
         Err(ShellError::labeled_error(
             "rm not currently supported on values",
             "not currently supported",