HTTP 1.1 Status codes and their corresponding status information and meaning

Source: Internet
Author: User
The following table lists common HTTP 1.1 statuses. Code And their corresponding status information and meaning.

Exercise caution when using status code that only supports HTTP 1.1, because many browsers only Support HTTP 1.0. If you use the status code unique to HTTP 1.1, you 'd better check the HTTP version number of the request.

Status Code Status information Description
100 Continue The initial request has been accepted, and the customer should continue to send the rest of the request. (New HTTP 1.1)
101 Switching protocols ServerConvert client-compliant requests to another protocol (New HTTP 1.1)
200 OK Everything works normally. The response documents for get and post requests follow.
201 Created The server has created a document and the location header provides its URL.
202 Accepted The request has been accepted, but the processing has not been completed.
203 Non-authoritative information The document has been returned normally, but some response headers may be incorrect because the document is copied (New in HTTP 1.1 ).
204 NO content If no new document exists, the browser should continue to display the original document. If the user regularly refreshes the pageServletIt can be determined that the user documentation is new enough, and this status code is very useful.
205 Reset content There is no new content, but the browser should reset the content it shows. Used to force the browser to clear the input content of the form (New in HTTP 1.1 ).
206 Partial content The client sends a GET request with a range header, and the server completes the request (New in HTTP 1.1 ).
300 Multiple Choices Documents requested by the customer can be found in multiple locations, which are listed in the returned documents. If the server needs to give priority, it should be specified in the location response header.
301 Moved permanently The document requested by the customer is elsewhere. The new URL is provided in the location header, and the browser should automatically access the new URL.
302 Found Similar to 301, but the new URL should be treated as a temporary alternative, rather than permanent. Note that the corresponding status information in http1.0 is "Moved temporatily ".

When this status code appears, the browser can automatically access the new URL, so it is a very useful status code.

Note that this status code can be replaced with 301 sometimes. For example, if the browser mistakenly requests http: // host /~ If the user (with a slash missing), some servers return 301, and some return 302.

Strictly speaking, we can only assume that the browser will automatically redirect only when the original request is get. See 307.

303 See other Similar to 301/302, the difference is that if the original request is post, the redirection target document specified by the location header should be extracted through get (New in HTTP 1.1 ).
304 Not modified The client has a buffered document and sends a conditional request (generally, the IF-modified-since header is provided to indicate that the customer only wants to update the document on a specified date ). The server tells the customer that the original buffer documentation can still be used.
305 Use proxy The document requested by the customer should be extracted by the proxy server specified by the location header (New in HTTP 1.1 ).
307 Temporary redirect It is the same as 302 (found. Many browsers mistakenly respond to the 302 response for redirection. Even if the original request is post, it can only be redirected when the POST request actually responds to 303. For this reason, HTTP 1.1 adds 307 to clear the region code in several states: When a 303 response occurs, the browser can follow the redirected get and post requests; if a 307 response occurs, the browser can only follow the redirection to get requests. (New HTTP 1.1)
400 Bad request The request has a syntax error.
401 Unauthorized The customer attempted to access the password-protected page without authorization. The response contains a WWW-Authenticate header. the browser displays the username/password dialog box accordingly, and then sends a request again after entering the appropriate authorization header.
403 Forbidden Resource unavailable. The server understands the customer's request, but rejects the request. This is usually caused by permission settings for files or directories on the server.
404 Not found The resource at the specified location cannot be found. This is also a common response.
405 Method not allowed Request methods (get, post, Head, delete, put, Trace, etc.) are not applicable to specified resources. (New HTTP 1.1)
406 Not acceptable The specified resource has been found, but its MIME type is incompatible with the one specified by the customer in the accpet header (New in HTTP 1.1 ).
407 Proxy authentication required Similar to 401, the customer must first be authorized by the proxy server. (New HTTP 1.1)
408 Request timeout The customer has not issued any request within the waiting time of the server license. The customer can repeat the same request later. (New HTTP 1.1)
409 Conflict It is usually related to put requests. The request cannot be successful because the request conflicts with the current status of the resource. (New HTTP 1.1)
410 Gone The requested document is no longer available and the server does not know which address to redirect. It differs from 404 in that if 407 is returned, the document permanently leaves the specified position, and 404 indicates that the document is unavailable for unknown reasons. (New HTTP 1.1)
411 Length required The server cannot process the request unless the client sends a Content-Length header. (New HTTP 1.1)
412 Precondition failed Some preconditions specified in the request header fail (HTTP 1.1 is new ).
413 Request Entity too large The size of the target document exceeds the size that the server is willing to process. If the server thinks it can process the request later, it should provide a retry-after header (New in HTTP 1.1 ).
414 Request URI Too Long The URI is too long (New in HTTP 1.1 ).
416 Requested range not satisfiable The server cannot meet the range header specified by the customer in the request. (New HTTP 1.1)
500 Internal Server Error The server encounters unexpected circumstances and cannot complete the customer's request.
501 Not Implemented The server does not support the functions required to implement the request. For example, the customer sends a put request not supported by the server.
502 Bad Gateway When the server acts as a gateway or proxy, in order to complete the request to access the next server, but the server returns an invalid response.
503 Service unavailable The server fails to respond due to maintenance or heavy load. For example, the servlet mayDatabaseIf the connection pool is full, 503 is returned. When the server returns 503, A retry-after header can be provided.
504 Gateway timeout Used by a proxy or gateway server, it indicates that the remote server cannot receive a response in a timely manner. (New HTTP 1.1)
505 HTTP Version Not Supported the server does not support the HTTP Version specified in the request. (New HTTP 1.1)

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