List of common HTTP status codes

Source: Internet
Author: User
Tags switches

HTTP status Code

When a viewer accesses a webpage, the browser of the viewer makes a request to the server where the page is located. When a Web page is received and displayed by the browser, the server on which the page resides returns a message header (server header) that contains the HTTP status code to respond to the browser's request.

The HTTP status code is in EnglishHTTP Status Code

The following are the common HTTP status codes:

    • 200-Successful request
    • 301-Resources (Web pages, etc.) are permanently transferred to other URLs
    • 404-The requested resource (Web page, etc.) does not exist
    • 500-Internal Server error
HTTP status Code classification

The HTTP status code consists of three decimal digits, the first decimal number defines the type of the status code, and the latter two numbers do not have a function of classification. There are 5 types of HTTP status codes:

category Category Description
1** information , the server receives the request and requires the requestor to continue the operation
2** successful , the operation is successfully received and processed
3** Redirect, requires further action to complete the request
4** Client Error , request contains syntax error or cannot complete request
5** Server error , the server has an error while processing the request
HTTP Status Code list
Status Code Status Code English name Chinese Description
100 Continue Go on. The client should continue its request
101 Switching protocols Switch protocols. The server switches the protocol based on the client's request. You can only switch to a more advanced protocol, for example, a new version of the protocol that switches to HTTP
200 Ok The request was successful. Typically used for Get and post requests
201 Created has been created. A new resource was successfully requested and created
202 Accepted has been accepted. The request has been accepted, but the completion is not processed
203 Non-authoritative Information Non-authorized information. The request was successful. But the meta information returned is not on the original server, but a copy
204 No Content No content. The server processed successfully, but the content was not returned. Make sure the browser continues to display the current document without updating the page
205 Reset Content Resets the content. The server processing succeeds, and the user terminal (for example: browser) should reset the document view. The browser's form fields can be cleared by this return code
206 Partial Content Part of the content. The server successfully processed a partial GET request
300 Multiple Choices Multiple options. The requested resource can include multiple locations, which can return a list of resource characteristics and addresses for use in the user terminal (for example: browser) selection
301 Moved Permanently Move permanently. The requested resource has been permanently moved to the new URI, the return information will include the new URI, and the browser will automatically redirect to the new URI. Any future new requests should be replaced with a new URI
302 Found Temporary move. Similar to 301. But resources are only temporarily moved. The client should continue to use the original URI
303 See other See other addresses. Similar to 301. Viewing with Get and post requests
304 Not Modified Not modified. The requested resource is not modified and no resources are returned when the server returns this status code. Clients typically cache accessed resources by providing a header indicating that the client wants to return only the resources modified after the specified date
305 Use Proxy Use a proxy. The requested resource must be accessed through the proxy
60S Unused HTTP status codes that have been discarded
307 Temporary Redirect Temporary redirection. Similar to 302. REDIRECT with GET request
400 Bad Request Client request syntax error, server does not understand
401 Unauthorized Request for user authentication
402 Payment Required Reserved for future use
403 Forbidden The server understands the request from the requesting client, but refuses to execute the request
404 Not Found The server could not find the resource (Web page) based on the client's request. With this code, the Web designer can set up a personalized page that "the resource you requested could not be found"
405 Method not allowed The method in the client request is forbidden
50W Not acceptable The server cannot complete the request based on the content attributes requested by the client
407 Proxy Authentication Required The request requires the authentication of the agent, similar to 401, but the requestor should use the proxy for authorization
408 Request time-out The server waits for a client to send a request that is too long and times out
409 Conflict It is possible for the server to complete a put request from the client to return this code when the server handles the request and a conflict occurs
410 Gone The resource requested by the client no longer exists. 410 is different from 404, if the resource is now permanently deleted and can use 410 code, the site designer can specify a new location for the resource through 301 code
411 Length Required The server cannot process request information sent by the client without content-length
412 Precondition Failed Prerequisite error for client request information
413 Request Entity Too Large The request was rejected because the requested entity was too large to be processed by the server. To prevent successive requests from the client, the server may close the connection. If only the server is temporarily unable to process, it will contain a retry-after response message
414 Request-uri Too Large The requested URI is too long (the URI is usually the URL) and the server cannot process
415 Unsupported Media Type The server cannot process the media format that was included with the request
416 Requested range not satisfiable Invalid scope for client request
417 Expectation Failed Server failed to satisfy expect request header information
500 Internal Server Error Server internal error, unable to complete request
501 Not implemented The server does not support the requested feature and cannot complete the request
40S Bad Gateway A server acting as a gateway or proxy that received an invalid request from the remote server
503 Service unavailable Due to overloading or system maintenance, the server is temporarily unable to process client requests. The length of the delay can be included in the server's Retry-after header information
504 Gateway time-out A server that acts as a gateway or proxy and does not get requests from the remote server in time
505 HTTP Version not supported The server does not support the version of the requested HTTP protocol and cannot complete processing

Reference

    • Hypertext Transfer Protocol--http/1.1
    • HTTP status message "W3school"

List of common HTTP status codes

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