HTTP return status codes and errors

HTTP Return Status Code
One, 1xx-Information tips
These status codes represent a temporary response. The client should be prepared to receive one or more 1xx responses before receiving a regular response. 100-Continue.

? 101-Switch protocol.

Second, 2xx-success
This type of status code indicates that the server successfully accepted the client request. 200-OK. The client request was successful.
? 201-created.
? 202-accepted.
? 203-Non-authoritative information.
? 204-no content.
? 205-Reset the content.
? 206-Partial content.

Third, 3xx-redirect
The client browser must take more action to implement the request. For example, the browser might have to request a different page on the server, or repeat the request through a proxy server. 302-The object has been moved.
? 304-not modified.
? 307-Temporary redirection.

Quad, 4xx-Client Error
An error occurred and the client appears to be having problems. For example, a client requests a page that does not exist, and the client does not provide valid authentication information. 400-Bad request.
? 401-access is denied. IIS defines a number of different 401 errors, which indicate a more specific cause of the error. These specific error codes are displayed in the browser, but are not displayed in the IIS log:? 401.1-Login failed.
? 401.2-The server configuration caused the login to fail.
? 401.3-not authorized due to ACL restrictions on resources.
? 401.4-Filter Authorization failed.
? 401.5-ISAPI/CGI application authorization failed.
? 401.7– access is denied by the URL authorization policy on the WEB server. This error code is specific to IIS 6.0.
? 403-Forbidden: IIS defines a number of different 403 errors that indicate a more specific cause of the error:? 403.1-execution access is forbidden.
? 403.2-Read access is forbidden.
? 403.3-Write access is forbidden.
? 403.4-Requires SSL.
? 403.5-Requires SSL 128.
? The 403.6-IP address is rejected.
? 403.7-Requires a client certificate.
? 403.8-site access is denied.
? 403.9-Excessive number of users.
? 403.10-Invalid configuration.
? 403.11-Password change.
? 403.12-Deny access to the mapping table.
? 403.13-The client certificate is revoked.
? 403.14-Reject directory list.
? 403.15-Client access permission exceeded.
? 403.16-Client certificate is not trusted or invalid.
? 403.17-The client certificate has expired or is not yet valid.
? 403.18-The requested URL cannot be executed in the current application pool. This error code is specific to IIS 6.0.
? 403.19-CGI cannot be executed for clients in this application pool. This error code is specific to IIS 6.0.
? 403.20-passport Login failed. This error code is specific to IIS 6.0.
? 404-not found.? 404.0-(None) – No files or directories found.
? 404.1-Unable to access the WEB site on the requested port.
? The 404.2-web service extension lockout policy blocks this request.
? The 404.3-mime mapping policy blocks this request.
? 405-The HTTP verb used to access this page is not allowed (method not allowed)
? 406-The client browser does not accept the MIME type of the requested page.
? 407-proxy authentication is required.
? 412-Precondition failed.
? 413– request entity is too large.
? 414-The request URI is too long.
? 415– media types not supported.
? The range requested by 416– is not sufficient.
? 417– execution failed.
? 423– a locked error.

Five, 5xx-server error
The server could not complete the request because it encountered an error. 500-Internal server error.? 500.12-The application is busy restarting on the WEB server.
? The 500.13-web server is too busy.
? 500.15-Direct Request Global.asa is not allowed.
? 500.16–unc authorization credentials are incorrect. This error code is specific to IIS 6.0.
? The 500.18–url authorization store cannot be opened. This error code is specific to IIS 6.0.
? 500.100-Internal ASP error.
? 501-The header value specifies the configuration that is not implemented.
? An invalid response was received when the 502-web server was used as a gateway or proxy server. The 502.1-cgi application timed out.
? 502.2-CGI Application error. Application.
? 503-The service is not available. This error code is specific to IIS 6.0.
? 504-The gateway timed out.
? 505-http version is not supported.

HTTP return status codes and errors