diff --git a/httpie/cli/constants.py b/httpie/cli/constants.py
index 2b22fbe0..ba34dcc9 100644
--- a/httpie/cli/constants.py
+++ b/httpie/cli/constants.py
@@ -6,7 +6,7 @@ import ssl
 
 
 # TODO: Use MultiDict for headers once added to `requests`.
-# https://github.com/jakubroztocil/httpie/issues/130
+# <https://github.com/jakubroztocil/httpie/issues/130>
 
 
 # ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
diff --git a/httpie/client.py b/httpie/client.py
index 34aa2f10..431bee4f 100644
--- a/httpie/client.py
+++ b/httpie/client.py
@@ -183,13 +183,13 @@ def finalize_headers(headers: RequestHeadersDict) -> RequestHeadersDict:
     final_headers = RequestHeadersDict()
     for name, value in headers.items():
         if value is not None:
-            # >leading or trailing LWS MAY be removed without
-            # >changing the semantics of the field value"
-            # -https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html
+            # “leading or trailing LWS MAY be removed without
+            # changing the semantics of the field value”
+            # <https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html>
             # Also, requests raises `InvalidHeader` for leading spaces.
             value = value.strip()
             if isinstance(value, str):
-                # See: https://github.com/jakubroztocil/httpie/issues/212
+                # See <https://github.com/jakubroztocil/httpie/issues/212>
                 value = value.encode('utf8')
         final_headers[name] = value
     return final_headers
diff --git a/httpie/sessions.py b/httpie/sessions.py
index 7d75583e..7ed7331e 100644
--- a/httpie/sessions.py
+++ b/httpie/sessions.py
@@ -21,7 +21,7 @@ DEFAULT_SESSIONS_DIR = DEFAULT_CONFIG_DIR / SESSIONS_DIR_NAME
 VALID_SESSION_NAME_PATTERN = re.compile('^[a-zA-Z0-9_.-]+$')
 # Request headers starting with these prefixes won't be stored in sessions.
 # They are specific to each request.
-# https://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Requests
+# <https://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Requests>
 SESSION_IGNORED_HEADER_PREFIXES = ['Content-', 'If-']
 
 
@@ -102,7 +102,7 @@ class Session(BaseConfigDict):
 
     @cookies.setter
     def cookies(self, jar: RequestsCookieJar):
-        # https://docs.python.org/2/library/cookielib.html#cookie-objects
+        # <https://docs.python.org/2/library/cookielib.html#cookie-objects>
         stored_attrs = ['value', 'path', 'secure', 'expires']
         self['cookies'] = {}
         for cookie in jar: