minor simplifications

mitmproxy/models/http.py

@@ -184,9 +184,6 @@ class HTTPRequest(MessageMixin, Request):
     def __hash__(self):
         return id(self)
 
-    def set_auth(self, auth):
-        self.data.headers.set_all("Proxy-Authorization", (auth,))
-
     def replace(self, pattern, repl, *args, **kwargs):
         """
             Replaces a regular expression pattern with repl in the headers, the

mitmproxy/protocol/http.py

@@ -184,7 +184,7 @@ class HttpLayer(Layer):
                 flow.request = request
                 # set upstream auth
                 if self.mode == "upstream" and self.config.upstream_auth is not None:
-                    flow.request.set_auth(self.config.upstream_auth)
+                    self.data.headers["Proxy-Authorization"] = self.config.upstream_auth
                 self.process_request_hook(flow)
 
                 if not flow.response: