HTTP Response Code

100  = Continue
101  = Switching Protocols
102  = Processing (WebDAV)

200  = OK
201  = Created
202  = Accepted
203  = Non-Authoritative Information
204  = No Content
205  = Reset Content
206  = Partial Content
207  = Multi-Status (WebDAV)
208  = Already Reported (WebDAV)
226  = IM Used

300  = Multiple Choices
301  = Moved Permanently
302  = Found
303  = See Other
304  = Not Modified
305  = Use Proxy
306  = (Unused)
307  = Temporary Redirect
308  = Permanent Redirect (experimental)

400  = Bad Request
401  = Unauthorized
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
418  = I'm a teapot (RFC 2324)
420  = Enhance Your Calm (Twitter)
422  = Unprocessable Entity (WebDAV)
423  = Locked (WebDAV)
424  = Failed Dependency (WebDAV)
425  = Reserved for WebDAV
426  = Upgrade Required
428  = Precondition Required
429  = Too Many Requests
431  = Request Header Fields Too Large
444  = No Response (Nginx)
449  = Retry With (Microsoft)
450  = Blocked by Windows Parental Controls (Microsoft)
451  = Unavailable For Legal Reasons
499  = Client Closed Request (Nginx)

500  = Internal Server Error
501  = Not Implemented
502  = Bad Gateway
503  = Service Unavailable
504  = Gateway Timeout
505  = HTTP Version Not Supported
506  = Variant Also Negotiates (Experimental)
507  = Insufficient Storage (WebDAV)
508  = Loop Detected (WebDAV)
509  = Bandwidth Limit Exceeded (Apache)
510  = Not Extended
511  = Network Authentication Required
598  = Network read timeout error
599  = Network connect timeout error




Reference :

http://www.restapitutorial.com/httpstatuscodes.html#