Remove Rx timeout constraint in the request response stage, fix premature connection termination (#121)

src/WebRequest.cpp

@@ -663,8 +663,10 @@ void AsyncWebServerRequest::send(AsyncWebServerResponse *response){
     _response = NULL;
     send(500);
   }
-  else
+  else {
+    _client->setRxTimeout(0);
     _response->_respond(this);
+  }
 }
 
 AsyncWebServerResponse * AsyncWebServerRequest::beginResponse(int code, const String& contentType, const String& content){