Informational 1xx:

100 HTTP_CONTINUE
101 HTTP_SWITCHING_PROTOCOLS

Successful 2xx:

200 HTTP_OK
201 HTTP_CREATED
202 HTTP_ACCEPTED
203 HTTP_NON_AUTHORITATIVE
204 HTTP_NO_CONTENT
205 HTTP_RESET_CONTENT
206 HTTP_PARTIAL_CONTENT

Redirection 3xx:

300 HTTP_MULTIPLE_CHOICES
301 HTTP_MOVED_PERMANENTLY
302 HTTP_MOVED_TEMPORARILY
303 HTTP_SEE_OTHER
304 HTTP_NOT_MODIFIED
305 HTTP_USE_PROXY
306
307 HTTP_TEMPORARY_REDIRECT

Client Error 4xx:

400 HTTP_BAD_REQUEST
401 HTTP_UNAUTHORIZED
402 HTTP_PAYMENT_REQUIRED
403 HTTP_FORBIDDEN
404 HTTP_NOT_FOUND
405 HTTP_METHOD_NOT_ALLOWED
406 HTTP_NOT_ACCEPTABLE
407 HTTP_PROXY_AUTHENTICATION_REQUIRED
408 HTTP_REQUEST_TIMEOUT
409 HTTP_CONFLICT
410 HTTP_GONE
411 HTTP_LENGTH REQUIRED
412 HTTP_PRECONDITION_FAILED
413 HTTP_REQUEST_ENTITY_TOO_LARGE
414 HTTP_REQUEST_URI_TOO_LARGE
415 HTTP_UNSUPPORTED_MEDIA_TYPE
416 HTTP_RANGE_NOT_SATISFIABLE
417 HTTP_EXPECTATION_FAILED

Server Error 5xx:

500 HTTP_INTERNAL_SERVER_ERROR
501 HTTP_NOT IMPLEMENTED
502 HTTP_BAD_GATEWAY
503 HTTP_SERVICE_UNAVAILABLE
504 HTTP_GATEWAY_TIME_OUT
505 HTTP_VERSION_NOT_SUPPORTED