200 normal; request has been completed.
201 normal; immediately POST command.
202 normal; has been accepted for processing, but the deal has not been completed.
203 normal; some information - information that is only part of the return.
204 normal; No response - has received the request, but there is no information to be sent back.
301 has been moved - the requested data with a new location and the change is permanent.
302 have been found - the data and request a different URI.
303 Please refer to the other - can be found under another URI response to the request, and should use the GET method to retrieve the response.
304 Not modified - is expected to modify the document fails.
305 Use proxy - must provide the agent the location field to access the requested resource.
306 not used - no longer used; keep this code for future use.
4xx client error
400 Bad request - syntax problem with the request, or can not meet the request.
401 Unauthorized - unauthorized client access to data.
402 need to pay - that billing system has been effective.
403 Forbidden - do not even need to authorize access.
404 - the server can not find the given resources; document does not exist.
407 proxy authentication requests - the client must first use the proxy authentication itself.
415 Media type not supported - the server refused to service the request because the request entity does not support the format.
5xx Server Error
500 internal error - because unforeseen circumstances, the server can not fulfill the request.
501 not implemented - server does not support the requested tool.
502 Bad gateway - The server received an invalid response from the upstream server.
503 can not access to services - due to temporary overloading or maintenance, the server can not handle the request.
HTTP 400 - Invalid request
HTTP 401.1 - Unauthorized: Logon failure
HTTP 401.2 - Unauthorized: Logon failed due to server configuration issues
HTTP 401.3 - ACL prohibit access to resources
HTTP 401.4 - Unauthorized: Authorization has been refused Filter
HTTP 401.5 - Unauthorized: ISAPI or CGI Authorization failed
HTTP 403 - Forbidden
HTTP 403 - on the Internet Services Manager (HTML) access is limited to Localhost
HTTP 403.1 Forbidden: executable access to prohibit
HTTP 403.2 - Forbidden: Read access prohibited
HTTP 403.3 - Forbidden: Write Access prohibited
HTTP 403.4 - Forbidden: SSL required
HTTP 403.5 - Forbidden: SSL 128 required
HTTP 403.6 - Forbidden: IP address rejected
HTTP 403.7 - Forbidden: Client certificate required
HTTP 403.8 - Forbidden: Site access to prohibit
HTTP 403.9 - Forbidden: too many connected users
HTTP 403.10 - Forbidden: Invalid Configuration
HTTP 403.11 - Forbidden: Password Change
HTTP 403.12 - Forbidden: Mapper denied access
HTTP 403.13 - Forbidden: Client certificate has been revoked
HTTP 403.15 - Forbidden: Client access license too
HTTP 403.16 - Forbidden: Client certificate untrusted or invalid
HTTP 403.17 - Forbidden: Client certificate has expired or not yet in force
HTTP 404.1 - Web site can not be found
HTTP 404 - File not found
HTTP 405 - Resource prohibited
HTTP 406 - not acceptable
HTTP 407 - proxy authentication required
HTTP 410 - never be used
HTTP 412 - precondition failed
HTTP 414 - Request - URI too long
HTTP 500 - Internal Server Error
HTTP 500.100 - Internal Server Error - ASP error
HTTP 500-11 server is down
HTTP 500-12 Application restart
HTTP 500-13 - Server too busy
HTTP 500-14 - the application is invalid
HTTP 500-15 - global.asa not allowed to request
Error 501 - Not Implemented
HTTP 502 - Gateway error