500
Is a browser code that means there was an error in displaying a webpage.
501 - Not implemented
Your Web server does not understand or does not support the HTTP method it finds in the HTTP data stream sent to it by the client (e.g. a Web browser or our CheckUpDown robot).
502 - Bad Gateway
A server (not necessarily a Web server) is acting as a gateway or proxy to fulfill the request by the client (e.g. your Web browser or our CheckUpDown robot) to access the requested URL. This server received an invalid response from an upstream server it accessed to fulfill the request.This usually does not mean that the upstream server is down (no response to the gateway/proxy), but rather that the upstream server and the gateway/proxy do not agree on the protocol for exchanging data. Given that Internet protocols are quite clear, it often means that one or both machines have been incorrectly or incompletely programmed.
504- Gateway Timeout
A server (not necessarily a Web server) is acting as a gateway or proxy to fulfil the request by the client (e.g. your Web browser or our CheckUpDown robot) to access the requested URL. This server did not receive a timely response from an upstream server it accessed to deal with your HTTP request.This usually means that the upstream server is down (no response to the gateway/proxy rather than that the upstream server and the gateway/proxy do not agree on the protocol for exchanging data.
505 - HTTP Version Not Supported
Your Web server does not support, or refuses to support, the HTTP protocol version specified by the client
(e.g. your Web browser or our CheckUpDown robot) in the HTTP request data stream sent to the server.The HTTP protocol has various versions identified as major.minor e.g. version 0.9, 1.0 or 1.1. Your server is indicating that it is unable or unwilling to complete the request using the major version provided by the client - other than with this error message.Assuming that your request identifies a valid major.minor version number (the request is not fundamentally corrupt), then this error should mostly only occur if you are trying to use version 1.0 or 1.1, but your
Web server only supports the older 0.9 version.
506
Is a browser code that signals ASP is not enabled for the domain name.
507
Is a browser code that means there is likely an error with the coding of a ASP page.
