Common HTTP status Codes

As a beginner, every time the problem is a timely summary is very good habits, so I have always insisted on doing so, as a programmer for the Internet development, the HTTP status code returned by some servers must know the meaning, so I today in my spare time to summarize these questions, On the one hand let oneself review again, on the other hand also hope can help others.

1xx: information

(A status code that represents a temporary response and requires the requestor to perform an action to continue)

News:	Describe:
Continue	The server only receives partial requests, but once the server does not reject the request, the client should continue to send the remaining requests.
101 Switching protocols	Server conversion protocol: The server translates the client's request to a different protocol.

2XX: Success

(used to indicate that the server has successfully processed the request's status code)

News:	Describe:
OK	The request succeeds (followed by the answer document for the Get and post requests.) ）
201 Created	The request is created and the new resource is created.
202 Accepted	The request for processing was accepted, but the processing was not completed.
203 non-authoritative Information	The document has returned normally, but some of the answer headers may be incorrect because a copy of the document is being used.
204 No Content	There are no new documents. The browser should continue to display the original document. If the user refreshes the page periodically, This status code is useful when the servlet can determine that the user's document is new enough.
205 Reset Content	There are no new documents. But the browser should reset what it displays. Used to force the browser to clear the form input.
206 Partial Content	The client sends a GET request with a range header, and the server finishes it.

3xx: redirect

(To complete the request, you need to proceed further.) Typically, these status codes are always redirected)

News:	Describe:
Multiple Choices	Multiple choices. A list of links. The user can select a link to reach the destination. A maximum of five addresses are allowed.
301 Moved Permanently	The requested page has been moved to a new URL.
302 Found	The requested page has been temporarily transferred to the new URL.
303 See other	The requested page can be found under a different URL.
304 Not Modified	The document was not modified as expected. The client has a buffered document and makes a conditional request (typically a if-modified-since header is provided to indicate that the customer only wants documents that are updated on a specified date) 。 The server tells the customer that the original buffered document can continue to be used.
305 Use Proxy	The document requested by the client should be extracted from the proxy server indicated by the location header.
306 Unused	This code is used in the previous version. It is no longer used, but the code is still retained.
307 Temporary Redirect	The requested page has been temporarily moved to a new URL.

4XX: Client Error

(These status codes indicate that the request may have failed and that the server has been prevented from processing the request)

News:	Describe:
Request	The server failed to understand the request.
401 Unauthorized	The requested page requires a user name and password.
402 Payment Required	This code is not yet available.
403 Forbidden	Access to the requested page is forbidden.
404 Not Found	The server was unable to find the requested page.
405 Method not allowed	The method specified in the request is not allowed.
406 Not acceptable	The server-generated response cannot be accepted by the client.
407 Proxy Authentication Required	The user must first authenticate with a proxy server so that the request is processed.
408 Request Timeout	The request exceeded the server's wait time.
409 Conflict	The request could not be completed because of a conflict.
410 Gone	The requested page is not available.
411 Length Required	"Content-length" is not defined. If there is no such content, the server will not accept the request.
412 Precondition Failed	The prerequisites in the request were evaluated by the server as failed.
413 Request Entity Too Large	The server does not accept the request because the requested entity is too large.
414 Request-url Too Long	The server will not accept the request because the URL is too long. When the POST request is converted to a long query letter This behavior occurs when a GET request is
415 Unsupported Media Type	The server will not accept the request because the media type is not supported.
416	The server does not meet the range header specified by the customer in the request.
417 Expectation Failed	The server does not meet the requirements for the expected Request header field.

5XX: Server Error

(These status codes indicate that the server has an internal error while trying to process the request.) These errors may be the fault of the server itself, not the request error.

News:	Describe:
Internal Server Error	The request was not completed. The server encountered unpredictable conditions.
501 Not implemented	The request was not completed. The requested functionality is not supported by the server.
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 overloaded or in a machine.
504 Gateway Timeout	The gateway timed out.
505 HTTP Version not supported	The server does not support the HTTP protocol version indicated in the request.

Common HTTP status Codes