http statusCode (status code)
201-206 indicate that the server successfully processed the request status code, indicating that the webpage can be accessed normally.
200 (Success) The server has successfully processed the request. Typically, this means that the server served the requested web page.
201 (created) The request was successful and the server has created a new resource.
202 (Accepted) The server has accepted the request but has not yet processed it.
203 (Unauthorized Information) The server successfully processed the request, but returned information that may have come from another source.
204 (No Content) The server successfully processed the request but returned no content.
205 (Reset Content) The server successfully processed the request but returned no content. Unlike the 204 response, this response requires the requester to reset the document view (eg, clear the form content to enter new content).
206 (Partial Content) The server successfully processed a partial GET request.
300-3007 means: To complete the request, you need to take further action. Usually, these status codes are redirected forever.
300 (multiple choices) The server can perform various actions upon request. Depending on the requestor, the server can choose an action, or provide a list of actions to choose from.
301 (Moved Permanently) The requested webpage has been permanently moved to a new location. When the server returns this response, it automatically redirects the requester to the new location. You should use this code to notify search engine spiders that a page or site has been permanently moved to a new location.
302 (Moved Temporarily) The server is currently responding to the request from a web page in a different location, but the requester should continue to use the original location for future requests. The requester is automatically redirected to a different location. However, since search engines will continue to crawl and index the old location, you should not use this code to tell search engines that a page or site has been moved.
303 (See other locations) The server returns this code when the requester should make separate GET requests for different locations to retrieve the response. For all requests except HEAD requests, the server automatically goes elsewhere.
304 (Not Modified) The requested page has not been modified since the last request. When the server returns this response, no web page content is returned. You should configure your server to return this response if the page has not changed since the requester's last request. This saves bandwidth and overhead because the server can tell search engines that the page has not changed since it was last crawled.
305 (Use Proxy) The requester can only use a proxy to access the requested web page. If the server returns this response, the server also indicates which proxy the requester should use.
307 (Temporary Redirect) The server is currently responding to the request from a web page in a different location, but the requester should continue to use the original location for future requests. The requester is automatically redirected to a different location. However, since search engines will continue to crawl and index the old location, you should not use this code to tell search engines that a page or site has been moved.
A 4XXHTTP status code indicates that the request may have gone wrong, preventing the server from processing it.
400 (Bad Request) The server does not understand the syntax of the request.
401 (Authentication Error) This page requires authorization. You may not want this page to be indexed.
403 (Forbidden) The server rejected the request.
404 (Not Found) The server cannot find the requested web page. For example, this code is often returned for pages that do not exist on the server
For example: http://www.0631abc.com/20100aaaa, it will enter the 404 error page
405 (Method Disabled) Disables the method specified in the request.
406 (Not Accepted) The requested web page could not be responded to with the requested content attributes.
407 (Proxy Authorization Required) This status code is similar to 401, but specifies that the requester must be authorized to use the proxy. If the server returns this response, it also indicates that the requester should use a proxy.
408 (Request Timeout) The server timed out while waiting for the request.
409 (Conflict) The server encountered a conflict in completing the request. The server MUST include information about the conflict in the response. The server may return this code in response to a PUT request that conflicts with the previous request, along with a list of the differences between the two requests.
410 (Deleted) The server returns this response when the requested resource has been permanently deleted. This code is similar to the 404 (Not Found) code, but is sometimes used in place of the 404 code in cases where the resource used to exist but does not exist now. If the resource has been permanently deleted, you should use 301 to specify the new location of the resource.
411 (Valid Length Required) The server did not accept requests without a payload-length header field.
412 (Precondition not met) The server did not satisfy one of the preconditions set by the requester in the request.
413 (Request Entity Too Large) The server cannot process the request because the request entity is too large for the server to handle.
414 (Requested URI too long) The requested URI (usually a URL) is too long for the server to process.
415 (Unsupported media type) The requested format is not supported by the requested page.
416 (The requested range does not meet the requirements) The server returns this status code if the page cannot provide the requested range.
417 (Expected value not met) The server did not meet the requirements for the "Expected" request header field.
500 to 505 means: The server encountered an internal error while trying to process the request. These errors may be errors of the server itself, not the request.
500 (Internal Server 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, the server may return this code when the request method is not recognized by the server.
502 (Bad Gateway) The server, acting as a gateway or proxy, received an invalid response from an upstream server.
503 (Service Unavailable) The server is currently unavailable (due to overloading or downtime for maintenance). Usually, this is just a temporary state.
504 (Gateway Timeout) The server, acting as a gateway or proxy, did not receive a request from the upstream server in a timely manner.
505 (HTTP version not supported) The server does not support the HTTP protocol version used in the request.