Http 简明教程
HTTP - Status Codes
服务器响应中的状态代码元素是一个 3 位整数，其中状态代码的第一个数字定义了响应的类型，而最后的两个数字没有分类作用。第一个数字有 5 个值：
The Status-Code element in a server response, is a 3-digit integer where the first digit of the Status-Code defines the class of response and the last two digits do not have any categorization role. There are 5 values for the first digit:
S.N. |
Code and Description |
1 |
*1xx: Informational*It means the request has been received and the process is continuing. |
2 |
*2xx: Success*It means the action was successfully received, understood, and accepted. |
3 |
*3xx: Redirection*It means further action must be taken in order to complete the request. |
4 |
*4xx: Client Error*It means the request contains incorrect syntax or cannot be fulfilled. |
5 |
*5xx: Server Error*It means the server failed to fulfill an apparently valid request. |
HTTP 状态代码是可扩展的，并且 HTTP 应用程序不需要理解所有已注册状态代码的含义。下面给出所有状态代码的列表。
HTTP status codes are extensible and HTTP applications are not required to understand the meaning of all the registered status codes. Given below is a list of all the status codes.
1xx: Information
Message |
Description |
100 Continue |
Only a part of the request has been received by the server, but as long as it has not been rejected, the client should continue with the request. |
101 Switching Protocols |
The server switches protocol. |
2xx: Successful
Message |
Description |
200 OK |
The request is OK. |
201 Created |
The request is complete, and a new resource is created . |
202 Accepted |
The request is accepted for processing, but the processing is not complete. |
203 Non-authoritative Information |
The information in the entity header is from a local or third-party copy, not from the original server. |
204 No Content |
A status code and a header are given in the response, but there is no entity-body in the reply. |
205 Reset Content |
The browser should clear the form used for this transaction for additional input. |
206 Partial Content |
The server is returning partial data of the size requested. Used in response to a request specifying a Range header. The server must specify the range included in the response with the Content-Range header. |
3xx: Redirection
Message |
Description |
300 Multiple Choices |
A link list. The user can select a link and go to that location. Maximum five addresses . |
301 Moved Permanently |
The requested page has moved to a new url . |
302 Found |
The requested page has moved temporarily to a new url . |
303 See Other |
The requested page can be found under a different url . |
304 Not Modified |
This is the response code to an If-Modified-Since or If-None-Match header, where the URL has not been modified since the specified date. |
305 Use Proxy |
The requested URL must be accessed through the proxy mentioned in the Location header. |
306 Unused |
This code was used in a previous version. It is no longer used, but the code is reserved. |
307 Temporary Redirect |
The requested page has moved temporarily to a new url. |
4xx: Client Error
Message |
Description |
400 Bad Request |
The server did not understand the request. |
401 Unauthorized |
The requested page needs a username and a password. |
402 Payment Required |
You can not use this code yet. |
403 Forbidden |
Access is forbidden to the requested page. |
404 Not Found |
The server can not find the requested page. |
405 Method Not Allowed |
The method specified in the request is not allowed. |
406 Not Acceptable |
The server can only generate a response that is not accepted by the client. |
407 Proxy Authentication Required |
You must authenticate with a proxy server before this request can be served. |
408 Request Timeout |
The request took longer than the server was prepared to wait. |
409 Conflict |
The request could not be completed because of a conflict. |
410 Gone |
The requested page is no longer available . |
411 Length Required |
The "Content-Length" is not defined. The server will not accept the request without it . |
412 Precondition Failed |
The pre condition given in the request evaluated to false by the server. |
413 Request Entity Too Large |
The server will not accept the request, because the request entity is too large. |
414 Request-url Too Long |
The server will not accept the request, because the url is too long. Occurs when you convert a "post" request to a "get" request with a long query information . |
415 Unsupported Media Type |
The server will not accept the request, because the mediatype is not supported . |
416 Requested Range Not Satisfiable |
The requested byte range is not available and is out of bounds. |
417 Expectation Failed |
The expectation given in an Expect request-header field could not be met by this server. |
5xx: Server Error
Message |
Description |
500 Internal Server Error |
The request was not completed. The server met an unexpected condition. |
501 Not Implemented |
The request was not completed. The server did not support the functionality required. |
502 Bad Gateway |
The request was not completed. The server received an invalid response from the upstream server. |
503 Service Unavailable |
The request was not completed. The server is temporarily overloading or down. |
504 Gateway Timeout |
The gateway has timed out. |
505 HTTP Version Not Supported |
The server does not support the "http protocol" version. |