| HTTP Code | Name | Category Name |
|---|---|---|
| 100 | Continue | Informational response |
| 101 | Switching Protocols | Informational response |
| 102 | Processing | Informational response |
| 103 | Early Hints *or* Checkpoint |
Informational response |
| 200 | OK | Success |
| 201 | Created | Success |
| 202 | Accepted | Success |
| 203 | Non-Authoritative Information | Success |
| 204 | No Content | Success |
| 205 | Reset Content | Success |
| 206 | Partial Content | Success |
| 207 | Multi-Status | Success |
| 208 | Already Reported | Success |
| 226 | IM Used | Success |
| 300 | Multiple Choices | Redirection |
| 301 | Moved Permanently | Redirection |
| 302 | Found, Moved temporarily | Redirection |
| 303 | See Other | Redirection |
| 304 | Not Modified | Redirection |
| 305 | Use Proxy | Redirection |
| 306 | Switch Proxy | Redirection |
| 307 | Temporary Redirect | Redirection |
| 308 | Permanent Redirect | Redirection |
| 400 | Bad Request | Client errors |
| 401 | Unauthorized | Client errors |
| 402 | Payment Required | Client errors |
| 403 | Forbidden | Client errors |
| 404 | Not Found | Client errors |
| 405 | Method Not Allowed | Client errors |
| 406 | Not Acceptable | Client errors |
| 407 | Proxy Authentication Required | Client errors |
| 408 | Request Timeout | Client errors |
| 409 | Conflict | Client errors |
| 410 | Gone | Client errors |
| 411 | Length Required | Client errors |
| 412 | Precondition Failed | Client errors |
| 413 | Payload Too Large | Client errors |
| 414 | URI Too Long | Client errors |
| 415 | Unsupported Media Type | Client errors |
| 416 | Range Not Satisfiable | Client errors |
| 417 | Expectation Failed | Client errors |
| 418 | I'm a teapot | Client errors |
| 421 | Misdirected Request | Client errors |
| 422 | Unprocessable Entity | Client errors |
| 423 | Locked | Client errors |
| 424 | Failed Dependency | Client errors |
| 425 | Too Early | Client errors |
| 426 | Upgrade Required | Client errors |
| 428 | Precondition Required | Client errors |
| 429 | Too Many Requests | Client errors |
| 431 | Request Header Fields Too Large | Client errors |
| 451 | Unavailable For Legal Reasons *or* Redirect |
Client errors |
| 500 | Internal Server Error | Server errors |
| 501 | Not Implemented | Server errors |
| 502 | Bad Gateway | Server errors |
| 503 | Service Unavailable | Server errors |
| 504 | Gateway Timeout | Server errors |
| 505 | HTTP Version Not Supported | Server errors |
| 506 | Variant Also Negotiates | Server errors |
| 507 | Insufficient Storage | Server errors |
| 508 | Loop Detected | Server errors |
| 510 | Not Extended | Server errors |
| 511 | Network Authentication Required | Server errors |
| 103 | Early Hints *or* Checkpoint |
Informational response |
| 218 | This is fine (Apache Web Server) | Unofficial codes |
| 419 | Page Expired (Laravel Framework) | Unofficial codes |
| 420 | Method Failure (Spring Framework) *or* Enhance Your Calm (Twitter) |
Unofficial codes |
| 420 | Method Failure (Spring Framework) *or* Enhance Your Calm (Twitter) |
Unofficial codes |
| 450 | Blocked by Windows Parental Controls (Microsoft) | Unofficial codes |
| 498 | Invalid Token (Esri) | Unofficial codes |
| 499 | Token Required (Esri) *or* Client Closed Request |
Unofficial codes |
| 509 | Bandwidth Limit Exceeded (Apache Web Server/cPanel) | Unofficial codes |
| 526 | Invalid SSL Certificate *or* Invalid SSL Certificate |
Unofficial codes |
| 530 | Site is frozen *or* Origin DNS Error |
Unofficial codes |
| 598 | (Informal convention) Network read timeout error | Unofficial codes |
| 440 | Login Time-out | Microsoft Internet Information Services |
| 449 | Retry With | Microsoft Internet Information Services |
| 451 | Unavailable For Legal Reasons *or* Redirect |
Client errors |
| 444 | No Response | nginx |
| 494 | Request header too large | nginx |
| 495 | SSL Certificate Error | nginx |
| 496 | SSL Certificate Required | nginx |
| 497 | HTTP Request Sent to HTTPS Port | nginx |
| 499 | Token Required (Esri) *or* Client Closed Request |
Unofficial codes |
| 520 | Unknown Error | Cloudflare |
| 521 | Web Server Is Down | Cloudflare |
| 522 | Connection Timed Out | Cloudflare |
| 523 | Origin Is Unreachable | Cloudflare |
| 524 | A Timeout Occurred | Cloudflare |
| 525 | SSL Handshake Failed | Cloudflare |
| 526 | Invalid SSL Certificate *or* Invalid SSL Certificate |
Unofficial codes |
| 527 | Railgun Error | Cloudflare |
| 530 | Site is frozen *or* Origin DNS Error |
Unofficial codes |