HTTP return status code and meaning

I do not know if we have encountered the Internet to open the page after the report303,403wait for the wrong, let HouIEwill give a lot of tips to tell you how to deal with these things, but finally can not open the Web page, some people think it is their own network problems, in fact, sometimes the server load of Web pages will appear this kind of phenomenon, so we will have a good understanding of what the code represents the meaning of,HTTPStatus Code (HTTP Status Code) is used to represent the Web serverHTTPof the response state3bit number code. It byRFC 2616defined by the specification, and getRFC 2518,RFC 2817,RFC 2295,RFC 2774,RFC 4918and other specification extensions.

1xx(temporary response)
A status code that represents a temporary response and requires the requestor to continue the operation.
Code Description
The request shall continue to be made by the requesting person (continued). The server returns this code to indicate that the first part of the request was received and is waiting for the remainder.
101 (switching protocol) The requestor has asked the server to switch protocols and the server has confirmed and is ready to switch.

2xx (success)
represents the status code that successfully processed the request.
Code Description
A successful server has successfully processed the request. Typically, this indicates that the server provided the requested Web page.
201 (created) the request was successful and the server created a new resource.
202 (accepted) the server has accepted the request but has not yet processed it.
The 203 (non-authoritative information) server has successfully processed the request, but the information returned may be from another source.
The 204 (no content) server successfully processed the request, but did not return any content.
the 205 (reset content) server successfully processed the request, but did not return any content.
the 206 (partial content) server successfully processed a partial GET request.

3xx (redirected)
indicates that further action is required to complete the request. Typically, these status codes are used for redirection.

Code Description
(multiple options) the server can perform a variety of actions for the request. The server can select an action based on the requestor (user agent) or provide a list of actions for the requestor to select.
301 (permanently moved) The requested page has been permanently moved to a new location. When the server returns this response ( a response to a GET or HEAD request), the requestor is automatically forwarded to the new location.
The 302 (temporary Move) server currently responds to requests from a Web page in a different location, but the requestor should continue to use the original location for future requests.
303 (View other locations) The server returns this code when the requester should use a separate GET request for the different locations to retrieve the response.
304 (not modified) The requested webpage has not been modified since the last request. When the server returns this response, the Web page content is not returned.
305 (using proxies) the requestor can only use the proxy to access the requested Web page. If the server returns this response, it also indicates that the requestor should use the proxy.
The 307 (Temporary redirect) server currently responds to requests from a Web page in a different location, but the requestor should continue to use the original location for future requests.

4xx(Request error)
These status codes indicate a possible error in the request and hinder the processing of the server.

Code Description
The (Error request) server does not understand the syntax of the request.
The 401 (Unauthorized) request requires authentication. The server may return this response for pages that need to log on.
403 (Forbidden) The server rejects the request.
404 (not found) The requested webpage was not found by the server.
405 (method Disabled) Disables the method specified in the request.
406 (not accepted) cannot use the requested content attribute to respond to the requested Web page.
407 (requires proxy authorization) This status code is similar to 401 (unauthorized), but specifies that the requestor should authorize the use of the proxy.
408 (Request timed out) A timeout occurred while the server was waiting for a request.
the 409 (conflict) server has a conflict when the request is completed. The server must include information about the conflict in the response.
410 (deleted) If the requested resource has been permanently deleted, the server returns this response.
411 (requires valid length) The server does not accept requests that do not contain a valid Content-Length header field.
412 (precondition not met) the server does not meet one of the prerequisites set by the requestor in the request.
413 (Request entity is too large) the server cannot process the request because the request entity is too large to exceed the processing power of the server.
414 (The requested URI is too long) The requested URI(usually the URL) is too long for the server to process.
415 (Unsupported media type) The requested format is not supported by the requested page.
416 (Request scope does not meet the requirements) if the page cannot provide the requested scope, the server returns this status code.
417 (unmet expectations) the server did 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 error of the server itself, not the request.

Code Description
(Server internal error) the server encountered an error and could not complete the request.
501 (not yet implemented) the server does not have the capability to complete the request. For example, this code may be returned when the server does not recognize the request method.
the 502 (Error Gateway) server receives an invalid response from the upstream server as a gateway or proxy.
503 (Service Unavailable) server is not currently available (due to overloading or downtime maintenance). Typically, this is only a temporary state.
The 504 (Gateway Timeout) server acts as a gateway or proxy, but does not receive requests from the upstream server in a timely manner.
505 (http version not supported) the HTTP protocol version used in the request is not supported by the server .

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HTTP return status code and meaning