For a trivial example of using a function to generate dynamic content, let’s write a function that generates a page with a different random number each time it’s requested.

As this function shows, you can just use **FORMAT** to print HTML to the stream returned by request-reply-stream. In the next section, I’ll show you more convenient ways to programmatically generate HTML.9

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As it does in the publish-file function, the :path argument specifies the path part of the URL that will result in this function being invoked. The :function argument specifies either the name or an actual function object. Using the name of a function, as shown here, allows you to redefine the function later without republishing and have AllegroServe use the new function definition. After evaluating the call to publish, you can point your browser at to get a page with a random number on it, as shown in Figure 26-3.

Figure 26-3. http://localhost:2001/random-number