Adding support for RFC 4918 status codes (#4291)

* Added HTTP status codes from RFC 4918

* Updated documentation about status codes

* Added reference to RFC 4918

docs/api-guide/status-codes.md

@@ -50,6 +50,7 @@ This class of status code indicates that the client's request was successfully r
     HTTP_204_NO_CONTENT
     HTTP_205_RESET_CONTENT
     HTTP_206_PARTIAL_CONTENT
+    HTTP_207_MULTI_STATUS
 
 ## Redirection - 3xx
 
@@ -86,6 +87,9 @@ The 4xx class of status code is intended for cases in which the client seems to
     HTTP_415_UNSUPPORTED_MEDIA_TYPE
     HTTP_416_REQUESTED_RANGE_NOT_SATISFIABLE
     HTTP_417_EXPECTATION_FAILED
+    HTTP_422_UNPROCESSABLE_ENTITY
+    HTTP_423_LOCKED
+    HTTP_424_FAILED_DEPENDENCY
     HTTP_428_PRECONDITION_REQUIRED
     HTTP_429_TOO_MANY_REQUESTS
     HTTP_431_REQUEST_HEADER_FIELDS_TOO_LARGE
@@ -101,6 +105,7 @@ Response status codes beginning with the digit "5" indicate cases in which the s
     HTTP_503_SERVICE_UNAVAILABLE
     HTTP_504_GATEWAY_TIMEOUT
     HTTP_505_HTTP_VERSION_NOT_SUPPORTED
+    HTTP_507_INSUFFICIENT_STORAGE
     HTTP_511_NETWORK_AUTHENTICATION_REQUIRED
 
 ## Helper functions

rest_framework/status.py

@@ -3,6 +3,7 @@ Descriptive HTTP status codes, for code readability.
 
 See RFC 2616 - http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 And RFC 6585 - http://tools.ietf.org/html/rfc6585
+And RFC 4918 - https://tools.ietf.org/html/rfc4918
 """
 from __future__ import unicode_literals
 
@@ -36,6 +37,7 @@ HTTP_203_NON_AUTHORITATIVE_INFORMATION = 203
 HTTP_204_NO_CONTENT = 204
 HTTP_205_RESET_CONTENT = 205
 HTTP_206_PARTIAL_CONTENT = 206
+HTTP_207_MULTI_STATUS = 207
 HTTP_300_MULTIPLE_CHOICES = 300
 HTTP_301_MOVED_PERMANENTLY = 301
 HTTP_302_FOUND = 302
@@ -62,6 +64,9 @@ HTTP_414_REQUEST_URI_TOO_LONG = 414
 HTTP_415_UNSUPPORTED_MEDIA_TYPE = 415
 HTTP_416_REQUESTED_RANGE_NOT_SATISFIABLE = 416
 HTTP_417_EXPECTATION_FAILED = 417
+HTTP_422_UNPROCESSABLE_ENTITY = 422
+HTTP_423_LOCKED = 423
+HTTP_424_FAILED_DEPENDENCY = 424
 HTTP_428_PRECONDITION_REQUIRED = 428
 HTTP_429_TOO_MANY_REQUESTS = 429
 HTTP_431_REQUEST_HEADER_FIELDS_TOO_LARGE = 431
@@ -72,4 +77,5 @@ HTTP_502_BAD_GATEWAY = 502
 HTTP_503_SERVICE_UNAVAILABLE = 503
 HTTP_504_GATEWAY_TIMEOUT = 504
 HTTP_505_HTTP_VERSION_NOT_SUPPORTED = 505
+HTTP_507_INSUFFICIENT_STORAGE = 507
 HTTP_511_NETWORK_AUTHENTICATION_REQUIRED = 511