Tclhttpd decodes URLs into references to functional modules called domains, each of which is free to interpret the browser's [httpd] protocol interaction (including URLs) in any way it likes.

Access control and Basic authentication is performed before dispatching to a domain.

The following domains are standard with Tclhttpd:

• Tclhttpd Document Domain: file access and templating.
• [Tclhttpd Cgi Domain]: CGI processing.
• Tclhttpd Direct Domain: direct calls of tcl procs yielding html and other data.
• [Tclhttpd Redirect Domain]: support for redirecting URLs
• [Tclhttpd Upload Domain]: file uploading of multipart/form-data. See File Upload example

Other domains can be created per-site, by including the domain handling code in the custom directory.

• examples here

A new domain can be registered by means of the Url_PrefixInstall command, which maps a URL prefix to a tcl proc which handles all URLs with the given prefix.

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Tclhttpd can roughly be functionally decomposed into

1. http protocol interaction to get the request - http.tcl
2. decoding a url - url.tcl
3. Domain handling to generate content
4. http protocol interaction to deliver the content - http.tcl

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