Fix HttpWebServerPacFilePlugin broken routes logic (#915)

* Fix `HttpWebServerPacFilePlugin` broken routes logic

* lint

Author: abhinavsingh

proxy/http/server/pac_plugin.py

@@ -52,8 +52,16 @@ def __init__(self, *args: Any, **kwargs: Any) -> None:
     def routes(self) -> List[Tuple[int, str]]:
         if self.flags.pac_file_url_path:
             return [
-                (httpProtocolTypes.HTTP, text_(self.flags.pac_file_url_path)),
-                (httpProtocolTypes.HTTPS, text_(self.flags.pac_file_url_path)),
+                (
+                    httpProtocolTypes.HTTP, r'{0}$'.format(
+                        text_(self.flags.pac_file_url_path),
+                    ),
+                ),
+                (
+                    httpProtocolTypes.HTTPS, r'{0}$'.format(
+                        text_(self.flags.pac_file_url_path),
+                    ),
+                ),
             ]
         return []   # pragma: no cover