Gateway Timeout server error response code indicates that the server, while acting as a gateway or proxy, cannot get a response in time.
A Gateway might refer to different things in networking and a 504 error is usually not something you can fix, but requires a fix by the web server or the proxies you are trying to get access through.
504 Gateway Timeout
|RFC 7231, section 6.6.4: 504 Gateway Timeout||Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content|
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|Feature||Android||Chrome for Android||Edge Mobile||Firefox for Android||IE Mobile||Opera Mobile||Safari Mobile|