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Help for HTTP error 504: “Gateway Timeout”This HTTP error occurs when there is a gateway or proxy1 between your web browser and a web server that you want to access (e.g. in your ISP) and the gateway experienced a time-out while waiting for a response from either the server that you are trying to access, or from an auxiliary server (e.g. a name server). error code 0x80244023 (hexadecimal 80244023).
Apache servers report this as:
official description of what causes the HTTP 504 status code is:
“The server, while acting as a gateway or proxy, did not receive a timely response from the upstream2 server specified by the URI (e.g. HTTP, FTP, LDAP) or some other auxiliary server (e.g. DNS) it needed to access in attempting to complete the request.”In that description,
An alternative symptom of a proxy DNS timeout is a HTTP 400 error.
HTTP error 408 occurs in the complementary situation of a downstream server timing out while waiting for information from an upstream device (e.g. a web browser).
HTTP 502 errors also arise from gateway/proxy problems, but arise when an invalid response was received from a downstream server. Microsoft IIS may report a 502.1 error when the gateway times out waiting for a response from a CGI application.1 Although “Gateway Timeout” is usually reported as the reason for HTTP 504 errors, they can also arise from problems with proxies, which are slightly different from gateways in that they do not act like origin servers.
2 Note that “upstream” here is in the context of the response, so the invalid response came from a server that was “downstream” of the proxy when the request was being sent.
3 Provided the earlier gateway/proxy isn't on part of the network that you can't bypass, e.g. mediating all traffic from your ISP or all traffic to the web server that you are trying to access.
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