Fix some issues, improve documentation

client/response_handler.py

@@ -46,20 +46,6 @@ class ResponseHandler(ABC):
     def handle(self):
         pass
 
-    @staticmethod
-    def parse_uri(uri: str):
-        parsed = urlsplit(uri)
-
-        # If there is no netloc, the url is invalid, so prepend `//` and try again
-        if parsed.netloc == "":
-            parsed = urlsplit("//" + uri)
-
-        host = parsed.netloc
-        path = parsed.path
-        if len(path) == 0 or path[0] != '/':
-            path = "/" + path
-        return host, path
-
 
 class BasicResponseHandler(ResponseHandler):
     """
@@ -98,11 +84,14 @@ class BasicResponseHandler(ResponseHandler):
         if 300 <= self.msg.status < 400:
             # Redirect
             return self._do_handle_redirect()
-        if 400 <= self.msg.status < 500:
+        if 400 <= self.msg.status < 600:
             # Dump headers and exit with error
-            print("".join(self.msg.raw), end="")
+            if not self.cmd.sub_request:
+                print("".join(self.msg.raw), end="")
             return None
 
+        return None
+
     def _do_handle_redirect(self):
         self._skip_body()