HTTP/1.1 Error 501 - Not Implemented

When you attempt to use an unknown method from an Internet client, the following error message occurs:

This behavior is by design. Internet Information Services (IIS) only supports the methods defined in "RFC 2616 - Hypertext Transfer Protocol -- HTTP/1.1" and "RFC 2518 - HTTP Extensions for Distributed Authoring -- WEBDAV." The methods are listed in the following table:

For more information on these topics, please see the information at the following:

• RFC 2616 - Hypertext Transfer Protocol -- HTTP/1.1 (ftp://ftp.isi.edu/in-notes/rfc2616.txt)
• RFC 2518 - HTTP Extensions for Distributed Authoring -- WEBDAV (ftp://ftp.isi.edu/in-notes/rfc2518.txt)