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HTTP Basics 

When writing an ISAPI application, you often examine and add to the information in HTTP header. Return codes indicate the success or failure of the requested event. Several common return codes are listed in the following table.

Return Code Meaning

200

URL located, transmission follows

400

Unintelligible request

404

Requested URL not found

405

Server does not support requested method

500

Unknown server error

503

Service unavailable

Additional return codes can be found in the AFXISAPI.H file. The HTTP responses are grouped as shown in the following table.

Group Meaning

200–299

Success

300–399

Information

400–499

Request error

500–599

Server error

The Hypertext Transfer Protocol (HTTP) is an application-level protocol for hypermedia information systems. For more information about HTTP, and how Web browsers and servers communicate, see the Hypertext Transfer Protocol (HTTP) specification:

http://www.w3.org/pub/WWW/Protocols/

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