Hypertext Transfer Protocol (HTTP) Status Code Registry

Hypertext Transfer Protocol (HTTP) Status Code Registry
Hypertext Transfer Protocol (HTTP) Status Code Registry
2025-09-15
Available Formats
XML
HTML
Plain text
Registry Included Below
HTTP Status Codes
HTTP Status Codes
Registration Procedure(s)
IETF Review
Reference
RFC9110, Section 16.2.1
Note
1xx: Informational - Request received, continuing process
2xx: Success - The action was successfully received, understood, and accepted
3xx: Redirection - Further action must be taken in order to complete the request
4xx: Client Error - The request contains bad syntax or cannot be fulfilled
5xx: Server Error - The server failed to fulfill an apparently valid request
Available Formats
CSV
Value
Description
Reference
100
Continue
RFC9110, Section 15.2.1
101
Switching Protocols
RFC9110, Section 15.2.2
102
Processing
RFC2518
103
Early Hints
RFC8297
104
Upload Resumption Supported (TEMPORARY - registered 2024-11-13, extension registered 2025-09-15, expires 2026-11-13)
draft-ietf-httpbis-resumable-upload-05
105-199
Unassigned
200
OK
RFC9110, Section 15.3.1
201
Created
RFC9110, Section 15.3.2
202
Accepted
RFC9110, Section 15.3.3
203
Non-Authoritative Information
RFC9110, Section 15.3.4
204
No Content
RFC9110, Section 15.3.5
205
Reset Content
RFC9110, Section 15.3.6
206
Partial Content
RFC9110, Section 15.3.7
207
Multi-Status
RFC4918
208
Already Reported
RFC5842
209-225
Unassigned
226
IM Used
RFC3229
227-299
Unassigned
300
Multiple Choices
RFC9110, Section 15.4.1
301
Moved Permanently
RFC9110, Section 15.4.2
302
Found
RFC9110, Section 15.4.3
303
See Other
RFC9110, Section 15.4.4
304
Not Modified
RFC9110, Section 15.4.5
305
Use Proxy
RFC9110, Section 15.4.6
306
(Unused)
RFC9110, Section 15.4.7
307
Temporary Redirect
RFC9110, Section 15.4.8
308
Permanent Redirect
RFC9110, Section 15.4.9
309-399
Unassigned
400
Bad Request
RFC9110, Section 15.5.1
401
Unauthorized
RFC9110, Section 15.5.2
402
Payment Required
RFC9110, Section 15.5.3
403
Forbidden
RFC9110, Section 15.5.4
404
Not Found
RFC9110, Section 15.5.5
405
Method Not Allowed
RFC9110, Section 15.5.6
406
Not Acceptable
RFC9110, Section 15.5.7
407
Proxy Authentication Required
RFC9110, Section 15.5.8
408
Request Timeout
RFC9110, Section 15.5.9
409
Conflict
RFC9110, Section 15.5.10
410
Gone
RFC9110, Section 15.5.11
411
Length Required
RFC9110, Section 15.5.12
412
Precondition Failed
RFC9110, Section 15.5.13
413
Content Too Large
RFC9110, Section 15.5.14
414
URI Too Long
RFC9110, Section 15.5.15
415
Unsupported Media Type
RFC9110, Section 15.5.16
416
Range Not Satisfiable
RFC9110, Section 15.5.17
417
Expectation Failed
RFC9110, Section 15.5.18
418
(Unused)
RFC9110, Section 15.5.19
419-420
Unassigned
421
Misdirected Request
RFC9110, Section 15.5.20
422
Unprocessable Content
RFC9110, Section 15.5.21
423
Locked
RFC4918
424
Failed Dependency
RFC4918
425
Too Early
RFC8470
426
Upgrade Required
RFC9110, Section 15.5.22
427
Unassigned
428
Precondition Required
RFC6585
429
Too Many Requests
RFC6585
430
Unassigned
431
Request Header Fields Too Large
RFC6585
432-450
Unassigned
451
Unavailable For Legal Reasons
RFC7725
452-499
Unassigned
500
Internal Server Error
RFC9110, Section 15.6.1
501
Not Implemented
RFC9110, Section 15.6.2
502
Bad Gateway
RFC9110, Section 15.6.3
503
Service Unavailable
RFC9110, Section 15.6.4
504
Gateway Timeout
RFC9110, Section 15.6.5
505
HTTP Version Not Supported
RFC9110, Section 15.6.6
506
Variant Also Negotiates
RFC2295
507
Insufficient Storage
RFC4918
508
Loop Detected
RFC5842
509
Unassigned
510
Not Extended (OBSOLETED)
RFC2774
][
Status change of HTTP experiments to Historic
511
Network Authentication Required
RFC6585
512-599
Unassigned