Shulou(Shulou.com)06/02 Report--

200-OK, the server returned the web page successfully

Standard response for successful HTTP requests.

301-Moved Permanently (permanent jump), the requested web page has been permanently redirected to a new location.

This and all future requests should be directed to the given.

304 (unmodified) the requested web page has not been modified since the last request. When the server returns this response, the web page content is not returned.

If the page has not changed since the requestor's last request, you should configure the server to return this response (called the If-Modified-Since HTTP header). The server can tell Googlebot that the web page has not changed since the last crawl, thereby saving bandwidth and overhead.

403-Forbidden (forbidden access), the server rejects the request, such problems are usually caused by improper configuration of server or service permissions.

One of the reasons is that the default home page parameter is not configured in the nginx configuration file, or the home page file does not contain the following contents in the site directory:

Index index.php index.html index.htm

The second reason: there is no home file specified in the configuration file in the site directory.

The third reason: the program files of the site directory or content do not have nginx user access.

Reason 4: allow,deny and other permission controls are set in the nginx configuration file, so that the client does not have access rights.

Forbidden request (matches a deny filter) = > HTTP 403The request was a legal request, but the server is refusing to respond to it.

404-Not Found,404-the requested web page does not exist

The server could not find the requested page. It is possible that there are no resources on the client server.

The requested resource could not be found but may be available again in the future.

500-Internal Server Error (internal server error), such as selinux is turned on, have no permission set for it.

Internal error in haproxy = > HTTP 500A generic error message, given when no more specific message is suitable.

502-Bad Gateway (bad gateway). Generally, when the gateway server requests the back-end service, the back-end service does not return the result correctly according to the http protocol.

The server returned an invalid or incomplete response = > HTTP 502The server was acting as a gateway or proxy and received an invalid response from the upstream server.

503-Service Unavailable (service is currently unavailable), possibly due to overload or downtime maintenance. 503-Server timeout

-no server was available to handle the request = > HTTP 503-The server is currently unavailable (because it is overloaded or down for maintenance).

504-Gateway Timeout (gateway timeout). Generally speaking, when the gateway server requests the backend service, the backend service does not complete the service within a specific time.

The server failed to reply in time = > HTTP 504The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.

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