Common Error Message in Web Programming

There's so many common error in web programming, well, here's some of them :

HTTP Error 400 - Bad Request
Due to malformed syntax, the request could not be understood by the server. The client should not repeat the request without modifications.Please contact the server's administrator if this problem persists.

HTTP Error 401.1 - Unauthorized: Logon Failed
This error indicates that the credentials passed to the server do not match the credentials required to log on to the server.Please contact the Web server's administrator to verify that you have permission to access the requested resource.

HTTP Error 401.2 - Unauthorized: Logon Failed due to server configuration
This error indicates that the credentials passed to the server do not match the credentials required to log on to the server. This is usually caused by not sending the proper WWW-Authenticate header field.Please contact the Web server's administrator to verify that you have permission to access to requested resource.

HTTP Error 401.3 - Unauthorized: Unauthorized due to ACL on resource
This error indicates that the credentials passed by the client do not have access to the particular resource on the server. This resource could be either the page or file listed in the address line of the client, or it could be another file on the server that is needed to process the file listed on the address line of the client.Please make a note of the entire address you were trying to access and then contact the Web server's administrator to verify that you have permission to access the requested resource.

HTTP Error 401.4 - Unauthorized: Authorization failed by filter
This error indicates that the Web server has a filter program installed to verify users connecting to the server. The authentication used to connect to the server was denied access by this filter program.Please make a note of the entire address you were trying to access and then contact the Web server's administrator to verify that you have permission to access the requested resource.

HTTP Error 401.5 - Unauthorized: Authorization failed by ISAPI/CGI app.
This error indicates that the address on the Web server you attempted to use has an ISAPI or CGI program installed that verifies user credentials before proceeding. The authentication used to connect to the server was denied access by this program.Please make a note of the entire address you were trying to access and then contact the Web server's administrator to verify that you have permission to access the requested resource.

HTTP Error 403.1 - Forbidden: Execute Access Forbidden
This error can be caused if you try to execute a CGI, ISAPI, or other executable program from a directory that does not allow programs to be executed.Please contact the Web server's administrator if the problem persists.

HTTP Error 403.2 - Forbidden: Read Access Forbidden
This error can be caused if there is no default page available and directory browsing has not been enabled for the directory, or if you are trying to display an HTML page that resides in a directory marked for Execute or Script permissions only.Please contact the Web server's administrator if the problem persists.

HTTP Error 403.3 - Forbidden: Write Access Forbidden
This error can be caused if you attempt to upload to, or modify a file in, a directory that does not allow Write access.Please contact the Web server's administrator if the problem persists.

HTTP Error 403.4 - Forbidden: SSL required
This error indicates that the page you are trying to access is secured with Secure Sockets Layer (SSL). In order to view it, you need to enable SSL by typing "https://" at the beginning of the address you are attempting to reach.Please contact the Web server's administrator if the problem persists.

HTTP Error 403.5 - Forbidden: SSL 128 required
This error message indicates that the resource you are trying to access is secured with a 128-bit version of Secure Sockets Layer (SSL). In order to view this resource, you need a browser that supports this level of SSL.Please confirm that your browser supports 128-bit SSL security. If it does, then contact the Web server's administrator and report the problem.