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HTTP Status Code Reference

Searchable, dated snapshot of the IANA status registry with RFC references.
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- 100ContinueRFC 9110 §15.2.1

Interim ack; the client may finish sending the request body.

- 101Switching ProtocolsRFC 9110 §15.2.2

The server agreed to switch protocols (e.g. to WebSocket).

- 103Early HintsRFC 8297

Preload hints sent before the final response.

- 200OKRFC 9110 §15.3.1

The request succeeded; the meaning of the body depends on the method.

- 201CreatedRFC 9110 §15.3.2

A new resource was created; Location says where.

- 202AcceptedRFC 9110 §15.3.3

Queued for processing, but completion is not guaranteed yet.

- 204No ContentRFC 9110 §15.3.5

Success with no body (common for DELETE and PUT).

- 206Partial ContentRFC 9110 §15.3.7

A Range request was satisfied; Content-Range describes the slice.

- 300Multiple ChoicesRFC 9110 §15.4.1

More than one representation exists; the client picks.

- 301Moved PermanentlyRFC 9110 §15.4.2

Permanent new location, so caches and links should update.

- 302FoundRFC 9110 §15.4.3

Temporary redirect; the method may change in practice (see 307/308).

- 303See OtherRFC 9110 §15.4.4

Fetch the target with GET; this is the post-POST redirect.

- 304Not ModifiedRFC 9110 §15.4.5

Conditional GET hit; the cached copy is still fresh.

- 307Temporary RedirectRFC 9110 §15.4.8

Temporary redirect that preserves the request method.

- 308Permanent RedirectRFC 9110 §15.4.9

Permanent redirect that preserves the request method.

- 400Bad RequestRFC 9110 §15.5.1

Malformed syntax the server refuses to process.

- 401UnauthorizedRFC 9110 §15.5.2

Authentication missing or failed (the name means unauthenticated).

- 402Payment RequiredRFC 9110 §15.5.3

Reserved, with no standard use.

- 403ForbiddenRFC 9110 §15.5.4

Authenticated but not allowed; do not retry with the same rights.

- 404Not FoundRFC 9110 §15.5.5

No resource at this URI; the catch-all client error.

- 405Method Not AllowedRFC 9110 §15.5.6

The method is not supported; Allow lists what is.

- 406Not AcceptableRFC 9110 §15.5.7

No representation matches the Accept headers.

- 408Request TimeoutRFC 9110 §15.5.9

The client took too long to finish sending.

- 409ConflictRFC 9110 §15.5.10

State conflict: concurrent edit, name clash, stale resource.

- 410GoneRFC 9110 §15.5.11

Deliberately removed: a permanent 404 with intent.

- 411Length RequiredRFC 9110 §15.5.12

Content-Length is required and missing.

- 412Precondition FailedRFC 9110 §15.5.13

An If-Match/If-Unmodified-Since guard rejected the request.

- 413Content Too LargeRFC 9110 §15.5.14

The body exceeds what the server accepts.

- 414URI Too LongRFC 9110 §15.5.15

The request-target exceeds the server's limits.

- 415Unsupported Media TypeRFC 9110 §15.5.16

The body's format is not supported.

- 416Range Not SatisfiableRFC 9110 §15.5.17

The requested Range lies outside the representation.

- 417Expectation FailedRFC 9110 §15.5.18

The Expect header cannot be met.

- 418I'm a teapotRFC 2324 §2.3.2

The 1998 April-fools teapot; real servers should not send it.

- 422Unprocessable ContentRFC 9110 §15.5.21

Well-formed but semantically invalid (the classic API validation error).

- 425Too EarlyRFC 8470

Replay-risk window; the server refuses early retries.

- 428Precondition RequiredRFC 6585 §3

The server demands conditional requests to avoid lost updates.

- 429Too Many RequestsRFC 6585 §4

Rate limited; Retry-After says when to come back.

- 431Request Header Fields Too LargeRFC 6585 §5

Header block exceeds limits (cookie bloat's favorite error).

- 451Unavailable For Legal ReasonsRFC 7725

Blocked for legal reasons; the response explains which.

- 500Internal Server ErrorRFC 9110 §15.6.1

The server broke; this is the catch-all server error.

- 501Not ImplementedRFC 9110 §15.6.2

The server does not support the functionality at all.

- 502Bad GatewayRFC 9110 §15.6.3

An upstream dependency returned something invalid.

- 503Service UnavailableRFC 9110 §15.6.4

Temporarily down or overloaded; Retry-After may say when.

- 504Gateway TimeoutRFC 9110 §15.6.5

An upstream did not answer in time.

- 505HTTP Version Not SupportedRFC 9110 §15.6.6

The requested HTTP version is refused.

- 507Insufficient StorageRFC 4918 §11.5

The server cannot store the representation (WebDAV).

- 508Loop DetectedRFC 5842 §7.2

Infinite bind-loop detected (WebDAV).

- 511Network Authentication RequiredRFC 6585 §6

Captive portal: authenticate to the network first.

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