Add fetch debug endpoint for requesting an url as a user

web/debug/server.go

@@ -35,6 +35,7 @@ func New(addr string) *Server {
 	handler.HandleFunc("GET /request-follow", kickoffFollow)
 	handler.HandleFunc("POST /send-as", proxyMessageToTarget)
 	handler.HandleFunc("GET /replies-to/{id}", inReplyTo)
+	handler.HandleFunc("POST /fetch", requestAs)
 	web := http.Server{
 		Addr: addr,
 		Handler: webutils.ChainMiddlewares(