requests: update comment about the "Host" header

Update the comment to explain the reason for poping out
"Host" header from headers. Ths host in the redirect URL
may not be the same as the original URL, pop out "Host" in
headers before redirect would force using the host specified
in the redirect URL.

Signed-off-by: 黃昕暐 <meebox@gmail.com>

Author: codemee

python-ecosys/requests/requests/__init__.py

@@ -180,7 +180,7 @@ def request(
 
     if redirect:
         s.close()
-        # use the Host in the redirect URL
+        # Use the host specified in the redirect URL, as it may not be the same as the original URL.
         headers.pop("Host", None)
         if status in [301, 302, 303]:
             return request("GET", redirect, None, None, headers, stream)