HTTP 狀態碼列表
前情
詞彙
- request: 請求
- method: 方法
- header: 標頭
- body: 正文
- response: 回應
提醒
- 狀態碼後面的英文，在 HTTP 1.x 是可選的；在 HTTP/2 和 HTTP/3 是「不可」存在的。
- 下列狀態碼已被棄用、將被棄用，或其實未實作： 102, 104, 306, 418, 510
| 回應狀態碼 | 回應標頭必含 | 請求方法限定 | 請求標頭必含 |
|---|---|---|---|
| 100 Continue | n/a | POST 等包含正文的方法 |
Expect: 100-continue |
| 101 Switching Protocols | n/a | 不限 | Connection: Upgrade, Upgrade |
| 103 Early Hints | Link |
不限 | n/a |
| – | – | – | – |
| 200 OK | Content-Type |
不限 | n/a |
| 201 Created | Location |
不限 | n/a |
| 202 Accepted | n/a | 不限 | n/a |
| 203 Non-Authoritative Information | |||
| 204 No Content | |||
| 205 Reset Content | |||
| 206 Partial Content | Accept-Ranges: bytes, Content-Range, Content-Type |
不限 | Range |
| 207 Multi-Status | |||
| 208 Already Reported | |||
| 226 IM Used | |||
| – | – | – | – |
| 300 Multiple Choices | Location |
不限 | n/a |
| 301 Moved Permanently | Location |
不限 | n/a |
| 302 Found | Location |
不限 | n/a |
| 303 See Other | Location |
不限 | n/a |
| 304 Not Modified | Last-Modified 或 ETag |
不限 | If-Modified-Since 或 If-None-Match |
| 305 Use Proxy | |||
| 307 Temporary Redirect | Location |
不限 | n/a |
| 308 Permanent Redirect | Location |
不限 | n/a |
| – | – | – | – |
| 400 Bad Request | n/a | 不限 | n/a |
| 401 Unauthorized | WWW-Authenticate不限 |
n/a | |
| 402 Payment Required | n/a | 不限 | n/a |
| 403 Forbidden | n/a | 不限 | n/a |
| 404 Not Found | n/a | 不限 | n/a |
| 405 Method Not Allowed | Allow |
不限 | n/a |
| 406 Not Acceptable | |||
| 407 Proxy Authentication Required | |||
| 408 Request Timeout | n/a | 不限 | n/a |
| 409 Conflict | |||
| 410 Gone | n/a | 不限 | n/a |
| 411 Length Required | POST 等包含正文的方法 |
不限 | n/a |
| 412 Precondition Failed | ?? | POST 等包含正文的方法 |
If-Unmodified-Since 或 If-Match |
| 413 Payload Too Large | |||
| 414 URI Too Long | |||
| 415 Unsupported Media Type | |||
| 416 Range Not Satisfiable | |||
| 417 Expectation Failed | |||
| 421 Misdirected Request | |||
| 422 Unprocessable Content | |||
| 423 Locked | |||
| 424 Failed Dependency | |||
| 425 Too Early | |||
| 426 Upgrade Required | |||
| 428 Precondition Required | |||
| 429 Too Many Requests | |||
| 431 Request Header Fields Too Large | |||
| 451 Unavailable For Legal Reasons | |||
| – | – | – | – |
| 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 | |||
| 507 Insufficient Storage | |||
| 508 Loop Detected | |||
| 510 Not Extended | |||
| 511 Network Authentication Required |
Informational 1xx
100 Continue
方法限定：POST 等，可以附帶「正文」的方法。
流程：
- 請求端僅發送標頭（但尚未請求完畢），其中包含
Expect: 100-continue - 伺服器回應
100 Continue（但回應尚未完畢） - 請求端繼續發送正文，直至完畢
- 伺服器回應最終狀態碼（
20x或其他），並結束回應。
注意：
- 請求標頭的值為
100-continue，中間是減號，且字母全小寫。 - 這是在請求傳送完畢前，就先傳送的狀態碼。
即一個回應中包含二次的狀態碼，第一次是100，而後等請求正文傳送後才發送最終狀態碼。
101 Switching Protocols
流程：
- 請求端發送標頭
Connection: Upgrade和Upgrade: <protocol>。（其中<protocol>是新的協議名稱） - 伺服器回應
101 Switch Protocols。 - 請求端以新協議發送新的請求。
提醒：
- 若伺服器逾時未回應，則依請求端情形（如僅是想從 HTTP 1.1 升到 HTTP/2，且為
POST方法）可能會接續傳送正文。 Upgrade標頭僅有HTTP/1.1可用。