XMLHttpRequest Understanding and common Web error codes 404 500

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404 indicates that the file or resource was not found
Common error codes for Java web
1.1xx-Information tip: 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.
2.2xx-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.
3.3xx-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.
301-The object has been permanently moved, that is, permanent redirection.
302-The object has been temporarily moved.
304-not modified.
307-Temporary redirection.
4.4xx-Client Error: An error occurred and the client appears to have a problem. 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-server configuration caused logon failure.
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 dedicated to IIS6.0. 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 SSL128.
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 dedicated to IIS6.0.
403.19-CGI cannot be executed for clients in this application pool. This error code is dedicated to IIS6.0.
403.20-passport Login failed. This error code is dedicated to IIS6.0.
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.
5.5xx-Server error: The server could not complete the request because it encountered an error.
500-Internal server error.
The 500.12-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 dedicated to IIS6.0.
The 500.18–url authorization store cannot be opened. This error code is dedicated to IIS6.0.
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 dedicated to IIS6.0.
The 504-gateway timed out.
505-http version is not supported.

XMLHttpRequest Understanding and common Web error codes 404 500