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This article mainly explains "what is the meaning of the status code that does not appear on the HTTP server connection". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. please follow the editor's train of thought to study and learn "what does the status code that appears on the HTTP server connection mean?"

500 server internal error (Internal Server Error)

The server encountered an unexpected condition that prevented it from responding to requests.

501Unimplemented (Not Implemented)

The server cannot provide support for the functionality requested in the request. If the server does not recognize the request method, it responds to this status code, which means that it cannot respond to any resources requested by the request.

502 illegal Gateway (Bad Gateway)

The server acting as a gateway or proxy receives an illegal response from the upstream (upstream) server to send the request.

503 Service unavailable (Service Unavailable)

The server is currently unable to process the request. This is generally caused by temporary overloading or maintenance of the server. The status code implies that the situation is temporary and will cause some delay.

Note: the 503 status code does not imply that the server must return this status code if it is overloaded. Some servers may want to simply disconnect when they are overloaded.

Large summary of IIS error codes

400 cannot resolve this request.

401.1 unauthorized: access denied due to invalid credentials.

401.2 unauthorized: access is denied because the server configuration tends to use alternative authentication methods.

401.3 unauthorized: access is denied due to ACL's settings for the requested resource.

401.4 unauthorized: the filter installed on the Web server failed to authorize.

401.5 unauthorized: ISAPI/CGI application authorization failed.

401.7 unauthorized: access denied due to URL authorization policy on the Web server.

403 access prohibited: access denied.

403.1 access prohibited: executive access denied.

403.2 No access: read access denied.

403.3 No access: write access denied.

403.4 No access: you need to use SSL to view this resource.

403.5 No access: you need to use SSL 128to view this resource.

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