在通过浏览器访问某个网站时，网站的响应头数据中，都会包含一个响应的状态码，如下图所示：

这种表示请求处理的状态码，一般包含两个部分：

HTTP 状态码(status code)和描述(reason-phrase)。

用于表示客户端HTTP请求的响应结果，标识服务器的处理是否处理正常状态，以及当前对应状态的简要描述。例如我们最常见的200表示响应成功，404代表找不到资源，500则是服务器异常等。

状态码的大类归纳信息总体如下：

• 1xx: 信息类状态(Informational)

• • 请求到达，继续处理 (Request received, continuing process)

• 2xx: 成功(Success) -

• • 请达正常处理完毕 (The action was successfully received, understood, and accepted)

• 3xx: 重定向(Redirection)

• • 需要更多操作完成请求 (Further action must be taken in order to complete the request)

• 4xx: 客户端错误(Client Error)

• • 请求包含语法错误或不能执行(The request contains bad syntax or cannot be fulfilled)

• 5xx: 服务器异常(Server Error)

• • 服务器执行请求失败 (The server failed to fulfill an apparently valid request)

在Tomcat内部，也有一个文件用于罗列描述这些HTTP状态码，此文件位于

org.apache.catalina.valves.LocalStrings.properties，大概是下图的样子：

Tomcat内部在处理请求发送响应的时候，根据不同的情况获取对应的property，内部的实现方式一般是这个样子：

response.getWriter().write(sm.getString("http.403"))

华丽的分隔线下，则是全部HTTP状态码及简要描述，各位朋友请慢用！

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---

status code Description

100 Continue

101 Switching Protocols

102 Processing

103-199 Unassigned

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

209-225 Unassigned

226 IM Used

227-299 Unassigned

300 Multiple Choices

301 Moved Permanently

302 Found

303 See Other

304 Not Modified

305 Use Proxy

306 (Unused)

307 Temporary Redirect

308 Permanent Redirect

309-399 Unassigned

400 Bad Request

401 Unauthorized

402 Payment Required

403 Forbidden

404 Not Found

405 Method Not Allowed

406 Not Acceptable

407 Proxy Authentication Required

408 Request Timeout

409 Conflict

410 Gone

411 Length Required

412 Precondition Failed

413 Payload Too Large

414 URI Too Long

415 Unsupported Media Type

416 Range Not Satisfiable

417 Expectation Failed

418-420 Unassigned

421 Misdirected Request

422 Unprocessable Entity

423 Locked

424 Failed Dependency

425 Unassigned

426 Upgrade Required

427 Unassigned

428 Precondition Required

429 Too Many Requests

430 Unassigned

431 Request Header Fields Too Large

432-450 Unassigned

451 Unavailable for Legal Reasons

452-499 Unassigned

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

509 Unassigned

510 Not Extended

511 Network Authentication Required

512-599 Unassigned

各status code详细描述如下，源自tomcat内的配置文件：

http.100=The client may continue.

http.101=The server is switching protocols according to the "Upgrade" header.

http.102=The server has accepted the complete request, but has not yet completed it.

http.201=The request succeeded and a new resource has been created on the server.

http.202=This request was accepted for processing, but has not been completed.

http.203=The meta information presented by the client did not originate from the server.

http.204=The request succeeded but there is no information to return.

http.205=The client should reset the document view which caused this request to be sent.

http.206=The server has fulfilled a partial GET request for this resource.

http.207=Multiple status values have been returned.

http.208=This collection binding was already reported.

http.226=The response is a representation of the result of one or more instance-manipulations applied to the current instance.

http.300=The requested resource corresponds to any one of a set of representations, each with its own specific location.

http.301=The requested resource has moved permanently to a new location.

http.302=The requested resource has moved temporarily to a new location.

http.303=The response to this request can be found under a different URI.

http.304=The requested resource is available and has not been modified.

http.305=The requested resource must be accessed through the proxy given by the "Location" header.

http.307=The requested resource resides temporarily under a different URI.

http.308=The target resource has been assigned a new permanent URI and any future references to this resource SHOULD use one of the returned URIs.

http.400=The request sent by the client was syntactically incorrect.

http.401=This request requires HTTP authentication.

http.402=Payment is required for access to this resource.

http.403=Access to the specified resource has been forbidden.

http.404=The requested resource is not available.

http.405=The specified HTTP method is not allowed for the requested resource.

http.406=The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers.

http.407=The client must first authenticate itself with the proxy.

http.408=The client did not produce a request within the time that the server was prepared to wait.

http.409=The request could not be completed due to a conflict with the current state of the resource.

http.410=The requested resource is no longer available, and no forwarding address is known.

http.411=This request cannot be handled without a defined content length.

http.412=A specified precondition has failed for this request.

http.413=The request entity is larger than the server is willing or able to process.

http.414=The server refused this request because the request URI was too long.

http.415=The server refused this request because the request entity is in a format not supported by the requested resource for the requested method.

http.416=The requested byte range cannot be satisfied.

http.417=The expectation given in the "Expect" request header could not be fulfilled.

http.422=The server understood the content type and syntax of the request but was unable to process the contained instructions.

http.423=The source or destination resource of a method is locked.

http.424=The method could not be performed on the resource because the requested action depended on another action and that action failed.

http.426=The request can only be completed after a protocol upgrade.

http.428=The request is required to be conditional.

http.429=The user has sent too many requests in a given amount of time.

http.431=The server refused this request because the request header fields are too large.

http.500=The server encountered an internal error that prevented it from fulfilling this request.

http.501=The server does not support the functionality needed to fulfill this request.

http.502=This server received an invalid response from a server it consulted when acting as a proxy or gateway.

http.503=The requested service is not currently available.

http.504=The server received a timeout from an upstream server while acting as a gateway or proxy.

http.505=The server does not support the requested HTTP protocol version.

http.506=The chosen variant resource is configured to engage in transparent content negotiation itself, and is therefore not a proper end point in the negotiation process.

http.507=The resource does not have sufficient space to record the state of the resource after execution of this method.

http.508=The server terminated an operation because it encountered an infinite loop.

http.510=The policy for accessing the resource has not been met in the request.

http.511=The client needs to authenticate to gain network access.

status code来自：

http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml