List of HTTP status codes :

1xx Informational- Request received, continuing process :

100: Continue
101: Switching Protocols

2xx Succes - The action was successfully received, understood, and accepted :

200: OK
201: Created
202: Accepted
203: Non-Authoritative Information
204: No Content
205: Reset Content
206: Partial Content

3xx Redirection - The client must take additional action to complete the request :

300: Multiple Choices
301: Moved Permanently
302: Moved Temporarily (HTTP/1.0)
302: Found (HTTP/1.1)
see 302 Google Jacking
303: See Other (HTTP/1.1)
304: Not Modified
305: Use Proxy
Many HTTP clients (such as Mozilla and Internet Explorer) don't correctly
handle responses with this status code.
306: (no longer used, but reserved)
307: Temporary Redirect

4xx Client Error - The request contains bad syntax or cannot be fulfilled :

400: Bad Request
401: Unauthorized
Similar to 403/Forbidden, but specifically for use when authentication is possible
but has failed or not yet been provided. See basic authentication scheme and
digest access authentication.
402: Payment Required
403: Forbidden
404: Not Found
405: Method Not Allowed
406: Not Acceptable
407: Proxy Authentication Required
408: Request Timeout
409: Conflict
410: Gone
411: Length Required
412: Precondition Failed
413: Request Entity Too Large
414: Request-URI Too Long
415: Unsupported Media Type
416: Requested Range Not Satisfiable
417: Expectation Failed

5xx Server Error - The server failed to fulfill an apparently valid request :

500: Internal Server Error
501: Not Implemented
502: Bad Gateway
503: Service Unavailable
504: Gateway Timeout
505: HTTP Version Not Supported
509: Bandwidth Limit Exceeded