"Kun-Ming Yang" <[EMAIL PROTECTED]> writes:
> Where to find the document for the error message, I got 502 and 503.
Those look like server error message numbers. Those are described in
the HTTP rfc and ultimately by the application that sends them. Here
is the description one can find in rfc2616:
10.5.3 502 Bad Gateway
The server, while acting as a gateway or proxy, received an invalid
response from the upstream server it accessed in attempting to
fulfill the request.
10.5.4 503 Service Unavailable
The server is currently unable to handle the request due to a
temporary overloading or maintenance of the server. The implication
is that this is a temporary condition which will be alleviated after
some delay. If known, the length of the delay MAY be indicated in a
Retry-After header. If no Retry-After is given, the client SHOULD
handle the response as it would for a 500 response.
Note: The existence of the 503 status code does not imply that a
server must use it when becoming overloaded. Some servers may wish
to simply refuse the connection.
