100 Continue
101 Switching Protocols
200 OK
201 Created
202 Accepted
203 Non-Authoritative Information
204 No Content
205 Reset Content
206 Partial Content
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
303 See Other
304 Not Modified
305 Use Proxy
400 Bad Request
401 Unauthorized / Authentication failure
402 Payment Required
403 Forbidden
404 Site Not Found
405 Method Not Allowed
406 Not Acceptable
407 Proxy Authentication Required
408 Request Time-out
409 Conflict
410 Gone
411 Length Required
412 Precondition Failed
413 Request Entity Too Large
414 Request-URI Too Large
415 Unsupported Media Type
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Time-out
505 HTTP Version not supported
Winsock error messages:
10004 The operation is canceled.
10013 The requested address is a broadcast address, but flag is not set.
10014 Invalid argument.
10022 Socket not bound, invalid address or listen is not invoked prior to accept.
10024 No more file descriptors are available, accept queue is empty.
10035 Socket is non-blocking and the specified operation will block.
10036 A blocking Winsock operation is in progress.
10037 The operation is completed. No blocking operation is in progress.
10038 The descriptor is not a socket.
10039 Destination address is required.
10040 The datagram is too large to fit into the buffer and is truncated.
10041 The specified port is the wrong type for this socket.
10042 Option unknown, or unsupported.
10043 The specified port is not supported.
10044 Socket type not supported in this address family.
10045 Socket is not a type that supports connection oriented service.
10047 Address Family is not supported.
10048 Address in use.
10049 Address is not available from the local machine.
10050 Network subsystem failed.
10051 The network cannot be reached from this host at this time.
10052 Connection has timed out when SO_KEEPALIVE is set.
10053 Connection is aborted due to timeout or other failure.
10054 The connection is reset by remote side.
10055 No buffer space is available.
10056 Socket is already connected.
10057 Socket is not connected.
10058 Socket has been shut down.
10060 The attempt to connect timed out.
10061 Connection is forcefully rejected.
10201 Socket already created for this object.
10202 Socket has not been created for this object.
11001 Authoritative answer: Host not found.
11002 Non-Authoritative answer: Host not found.
11003 Non-recoverable errors.
11004 Valid name, no data record of requested type.