Improve GraphQL timeout error message #518
Description
Currently if the GraphQL query takes longer than a certain period of time to return (or GH expects it to) we get a 502 error that isn't very clear; something like non-200 OK status code: 502 Bad Gateway body: "<html>\r\n<head><title>502 Bad Gateway</title></head>\r\n<body>\r\n<center><h1>502 Bad Gateway</h1></center>\r\n<hr><center>nginx</center>\r\n</body>\r\n</html>\r\n" it would be helpful to indicate the actual reason for the error.