Fix cleaned URL path in proxy

middleware/proxy/proxy.go

@@ -165,6 +165,11 @@ func createUpstreamRequest(r *http.Request) *http.Request {
 	outreq := new(http.Request)
 	*outreq = *r // includes shallow copies of maps, but okay
 
+	// Restore URL Path if it has been modified
+	if outreq.URL.RawPath != "" {
+		outreq.URL.Opaque = outreq.URL.RawPath
+	}
+
 	// Remove hop-by-hop headers to the backend.  Especially
 	// important is "Connection" because we want a persistent
 	// connection, regardless of what the client sent to us.  This

middleware/proxy/proxy_test.go

@@ -309,6 +309,8 @@ func TestUnixSocketProxyPaths(t *testing.T) {
 		{"/proxy/hello", "/proxy", fmt.Sprintf(greeting, "/hello")},
 		{"/proxy/foo/bar", "/proxy", fmt.Sprintf(greeting, "/foo/bar")},
 		{"/proxy/?foo=bar", "/proxy", fmt.Sprintf(greeting, "/?foo=bar")},
+		{"/queues/%2F/fetchtasks", "", fmt.Sprintf(greeting, "/queues/%2F/fetchtasks")},
+		{"/queues/%2F/fetchtasks?foo=bar", "", fmt.Sprintf(greeting, "/queues/%2F/fetchtasks?foo=bar")},
 	}
 
 	for _, test := range tests {