HTTP 状态码及含义

来自 Koa.js 官方文档中关于设置请求响应的部分 response.status=，列出了从 1xx ~ 5xx HTTP 状态码及含义，现摘录如下：

100 "continue"
101 "switching protocols"
102 "processing"
200 "ok"
201 "created"
202 "accepted"
203 "non-authoritative information"
204 "no content"
205 "reset content"
206 "partial content"
207 "multi-status"
208 "already reported"
226 "im used"
300 "multiple choices"
301 "moved permanently"
302 "found" 资源临时不可用，但在其他位置找到了，返回 302 同时带上Location: 新的资源地址 响应头。客户端根据新地址再次请求。
- 假如第一次请求使用的 POST，后面这次重新请求浏览器有可能变成 GET。
- 如果想要两次请求保持一致的请求方式，使用 307
- 运用场景：某些原因资源无法访问了，此时为了不让搜索引擎更新，可使用 302 告诉引擎资源还在。
303 "see other"
304 "not modified"
305 "use proxy"
307 "temporary redirect"
- 和 302 一模一样，区别在于两次请求保持一致的 http verb
308 "permanent redirect"
400 "bad request"
- 由于请求有语法错误，服务器不能识别
401 "unauthorized"
402 "payment required"
403 "forbidden"
404 "not found"
405 "method not allowed"
406 "not acceptable" 内容协商后没有合适的类型返回
407 "proxy authentication required"
408 "request timeout"
409 "conflict"
410 "gone"
411 "length required"
412 "precondition failed"
413 "payload too large"
- 比如 post 的数据也就是request body过大
414 "uri too long"
415 "unsupported media type"
416 "range not satisfiable"
417 "expectation failed"
418 "I'm a teapot"
422 "unprocessable entity"
423 "locked"
424 "failed dependency"
426 "upgrade required"
428 "precondition required"
429 "too many requests"
431 "request header fields too large"
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"

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