Make http -f display the request headers. Closes #9912 (#10022)

# Description
As described in https://github.com/nushell/nushell/issues/9912, the
`http` command could display the request headers with the `--full` flag,
which could help in debugging the requests. This PR adds such
functionality.

# User-Facing Changes
If `http get` or other `http` command which supports the `--full` flag
is invoked with the flag, it used to display the `headers` key which
contained an table of response headers. Now this key contains two nested
keys: `response` and `request`, each of them being a table of the
response and request headers accordingly.


![image](https://github.com/nushell/nushell/assets/24980/d3cfc4c3-6c27-4634-8552-2cdfbdfc7076)

crates/nu-command/src/network/http/client.rs

@@ -464,29 +464,46 @@ fn request_handle_response_content(
     requested_url: &str,
     flags: RequestFlags,
     resp: Response,
+    request: Request,
 ) -> Result<PipelineData, ShellError> {
-    let response_headers: Option<PipelineData> = if flags.full {
-        let headers_raw = request_handle_response_headers_raw(span, &resp)?;
-        Some(headers_raw)
-    } else {
-        None
+    // #response_to_buffer moves "resp" making it impossible to read headers later.
+    // Wrapping it into a closure to call when needed
+    let mut consume_response_body = |response: Response| {
+        let content_type = response.header("content-type").map(|s| s.to_owned());
+
+        match content_type {
+            Some(content_type) => transform_response_using_content_type(
+                engine_state,
+                stack,
+                span,
+                requested_url,
+                &flags,
+                response,
+                &content_type,
+            ),
+            None => Ok(response_to_buffer(response, engine_state, span)),
+        }
     };
 
-    let response_status = resp.status();
-    let content_type = resp.header("content-type").map(|s| s.to_owned());
-    let formatted_content = match content_type {
-        Some(content_type) => transform_response_using_content_type(
-            engine_state,
-            stack,
-            span,
-            requested_url,
-            &flags,
-            resp,
-            &content_type,
-        ),
-        None => Ok(response_to_buffer(resp, engine_state, span)),
-    };
     if flags.full {
+        let response_status = resp.status();
+
+        let request_headers_value = match headers_to_nu(&extract_request_headers(&request), span) {
+            Ok(headers) => headers.into_value(span),
+            Err(_) => Value::nothing(span),
+        };
+
+        let response_headers_value = match headers_to_nu(&extract_response_headers(&resp), span) {
+            Ok(headers) => headers.into_value(span),
+            Err(_) => Value::nothing(span),
+        };
+
+        let headers = Value::Record {
+            cols: vec!["request".to_string(), "response".to_string()],
+            vals: vec![request_headers_value, response_headers_value],
+            span,
+        };
+
         let full_response = Value::Record {
             cols: vec![
                 "headers".to_string(),
@@ -494,19 +511,16 @@ fn request_handle_response_content(
                 "status".to_string(),
             ],
             vals: vec![
-                match response_headers {
-                    Some(headers) => headers.into_value(span),
-                    None => Value::nothing(span),
-                },
-                formatted_content?.into_value(span),
+                headers,
+                consume_response_body(resp)?.into_value(span),
                 Value::int(response_status as i64, span),
             ],
             span,
-        }
-        .into_pipeline_data();
-        Ok(full_response)
+        };
+
+        Ok(full_response.into_pipeline_data())
     } else {
-        Ok(formatted_content?)
+        Ok(consume_response_body(resp)?)
     }
 }
 
@@ -517,11 +531,18 @@ pub fn request_handle_response(
     requested_url: &str,
     flags: RequestFlags,
     response: Result<Response, ShellErrorOrRequestError>,
+    request: Request,
 ) -> Result<PipelineData, ShellError> {
     match response {
-        Ok(resp) => {
-            request_handle_response_content(engine_state, stack, span, requested_url, flags, resp)
-        }
+        Ok(resp) => request_handle_response_content(
+            engine_state,
+            stack,
+            span,
+            requested_url,
+            flags,
+            resp,
+            request,
+        ),
         Err(e) => match e {
             ShellErrorOrRequestError::ShellError(e) => Err(e),
             ShellErrorOrRequestError::RequestError(_, e) => {
@@ -534,6 +555,7 @@ pub fn request_handle_response(
                             requested_url,
                             flags,
                             resp,
+                            request,
                         )?)
                     } else {
                         Err(handle_response_error(span, requested_url, *e))
@@ -546,16 +568,39 @@ pub fn request_handle_response(
     }
 }
 
-pub fn request_handle_response_headers_raw(
-    span: Span,
-    response: &Response,
-) -> Result<PipelineData, ShellError> {
-    let header_names = response.headers_names();
+type Headers = HashMap<String, Vec<String>>;
 
+fn extract_request_headers(request: &Request) -> Headers {
+    request
+        .header_names()
+        .iter()
+        .map(|name| {
+            (
+                name.clone(),
+                request.all(name).iter().map(|e| e.to_string()).collect(),
+            )
+        })
+        .collect()
+}
+
+fn extract_response_headers(response: &Response) -> Headers {
+    response
+        .headers_names()
+        .iter()
+        .map(|name| {
+            (
+                name.clone(),
+                response.all(name).iter().map(|e| e.to_string()).collect(),
+            )
+        })
+        .collect()
+}
+
+fn headers_to_nu(headers: &Headers, span: Span) -> Result<PipelineData, ShellError> {
     let cols = vec!["name".to_string(), "value".to_string()];
-    let mut vals = Vec::with_capacity(header_names.len());
+    let mut vals = Vec::with_capacity(headers.len());
 
-    for name in &header_names {
+    for (name, values) in headers {
         let is_duplicate = vals.iter().any(|val| {
             if let Value::Record { vals, .. } = val {
                 if let Some(Value::String {
@@ -568,10 +613,13 @@ pub fn request_handle_response_headers_raw(
             false
         });
         if !is_duplicate {
-            // Use the ureq `Response.all` api to get all of the header values with a given name.
+            // A single header can hold multiple values
             // This interface is why we needed to check if we've already parsed this header name.
-            for str_value in response.all(name) {
-                let header = vec![Value::string(name, span), Value::string(str_value, span)];
+            for str_value in values {
+                let header = vec![
+                    Value::string(name, span),
+                    Value::string(str_value.to_string(), span),
+                ];
                 vals.push(Value::record(cols.clone(), header, span));
             }
         }
@@ -585,7 +633,7 @@ pub fn request_handle_response_headers(
     response: Result<Response, ShellErrorOrRequestError>,
 ) -> Result<PipelineData, ShellError> {
     match response {
-        Ok(resp) => request_handle_response_headers_raw(span, &resp),
+        Ok(resp) => headers_to_nu(&extract_response_headers(&resp), span),
         Err(e) => match e {
             ShellErrorOrRequestError::ShellError(e) => Err(e),
             ShellErrorOrRequestError::RequestError(requested_url, e) => {

crates/nu-command/src/network/http/delete.rs

@@ -194,7 +194,7 @@ fn helper(
     request = request_add_authorization_header(args.user, args.password, request);
     request = request_add_custom_headers(args.headers, request)?;
 
-    let response = send_request(request, args.data, args.content_type, ctrl_c);
+    let response = send_request(request.clone(), args.data, args.content_type, ctrl_c);
 
     let request_flags = RequestFlags {
         raw: args.raw,
@@ -209,6 +209,7 @@ fn helper(
         &requested_url,
         request_flags,
         response,
+        request,
     )
 }
 

crates/nu-command/src/network/http/get.rs

@@ -178,7 +178,7 @@ fn helper(
     request = request_add_authorization_header(args.user, args.password, request);
     request = request_add_custom_headers(args.headers, request)?;
 
-    let response = send_request(request, None, None, ctrl_c);
+    let response = send_request(request.clone(), None, None, ctrl_c);
 
     let request_flags = RequestFlags {
         raw: args.raw,
@@ -193,6 +193,7 @@ fn helper(
         &requested_url,
         request_flags,
         response,
+        request,
     )
 }
 

crates/nu-command/src/network/http/options.rs

@@ -167,7 +167,7 @@ fn helper(
     request = request_add_authorization_header(args.user, args.password, request);
     request = request_add_custom_headers(args.headers, request)?;
 
-    let response = send_request(request, None, None, ctrl_c);
+    let response = send_request(request.clone(), None, None, ctrl_c);
 
     // http options' response always showed in header, so we set full to true.
     // And `raw` is useless too because options method doesn't return body, here we set to true
@@ -185,6 +185,7 @@ fn helper(
         &requested_url,
         request_flags,
         response,
+        request,
     )
 }
 

crates/nu-command/src/network/http/patch.rs

@@ -184,7 +184,7 @@ fn helper(
     request = request_add_authorization_header(args.user, args.password, request);
     request = request_add_custom_headers(args.headers, request)?;
 
-    let response = send_request(request, Some(args.data), args.content_type, ctrl_c);
+    let response = send_request(request.clone(), Some(args.data), args.content_type, ctrl_c);
 
     let request_flags = RequestFlags {
         raw: args.raw,
@@ -199,6 +199,7 @@ fn helper(
         &requested_url,
         request_flags,
         response,
+        request,
     )
 }
 

crates/nu-command/src/network/http/post.rs

@@ -184,7 +184,7 @@ fn helper(
     request = request_add_authorization_header(args.user, args.password, request);
     request = request_add_custom_headers(args.headers, request)?;
 
-    let response = send_request(request, Some(args.data), args.content_type, ctrl_c);
+    let response = send_request(request.clone(), Some(args.data), args.content_type, ctrl_c);
 
     let request_flags = RequestFlags {
         raw: args.raw,
@@ -199,6 +199,7 @@ fn helper(
         &requested_url,
         request_flags,
         response,
+        request,
     )
 }
 

crates/nu-command/src/network/http/put.rs

@@ -184,7 +184,7 @@ fn helper(
     request = request_add_authorization_header(args.user, args.password, request);
     request = request_add_custom_headers(args.headers, request)?;
 
-    let response = send_request(request, Some(args.data), args.content_type, ctrl_c);
+    let response = send_request(request.clone(), Some(args.data), args.content_type, ctrl_c);
 
     let request_flags = RequestFlags {
         raw: args.raw,
@@ -199,6 +199,7 @@ fn helper(
         &requested_url,
         request_flags,
         response,
+        request,
     )
 }
 

crates/nu-command/tests/commands/network/http/get.rs

@@ -138,9 +138,44 @@ fn http_get_with_custom_headers_as_records() {
         "http get -H {{content-type: text/plain}} {url}",
         url = server.url()
     ));
+
     mock1.assert();
     mock2.assert();
 }
+
+#[test]
+fn http_get_full_response() {
+    let mut server = Server::new();
+
+    let _mock = server.mock("GET", "/").with_body("foo").create();
+
+    let actual = nu!(pipeline(
+        format!(
+            "http get --full {url} --headers [foo bar] | to json",
+            url = server.url()
+        )
+        .as_str()
+    ));
+
+    let output: serde_json::Value = serde_json::from_str(&actual.out).unwrap();
+
+    assert_eq!(output["status"], 200);
+    assert_eq!(output["body"], "foo");
+
+    // There's only one request header, we can get it by index
+    assert_eq!(output["headers"]["request"][0]["name"], "foo");
+    assert_eq!(output["headers"]["request"][0]["value"], "bar");
+
+    // ... and multiple response headers, so have to search by name
+    let header = output["headers"]["response"]
+        .as_array()
+        .unwrap()
+        .iter()
+        .find(|e| e["name"] == "connection")
+        .unwrap();
+    assert_eq!(header["value"], "close");
+}
+
 // These tests require network access; they use badssl.com which is a Google-affiliated site for testing various SSL errors.
 // Revisit this if these tests prove to be flaky or unstable.