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500
The server encountered an error. This is most often caused by a scripting problem, a failed database access attempt, or other similar reasons.
501
The method you are using to access the document can not be performed by the server. Possible methods include:
CONNECT
DELETE
GET
HEAD
OPTIONS
POST
PUT
TRACE
502
The document requested resides on a 3rd party server and the original server received an error from the 3rd party server.
503
The server is overloaded or down for maintenance and due to this was unable to process the client request.
504
Most likely the client has lost connectivity (disconnected from the internet) or the cleint's host is having technical difficulties. This could also mean that a server that allows access to the requested server is down, having bandwidth/load issues, or otherwise unavailable.
505
The server does not support the HTTP version used by the client. (This usually occurs if the server is using an OLDER version of HTTP than the client.)
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