[plt-scheme] pretty URLs

> (serve/servlet start #:launch-browser #f #:port 80 #:servlet-path  
> (string->path "/code.ss"))
>
> --->
>
> Servlet (@ /servlets/code.ss) didn't load:
> build-path: absolute path "/code.ss" cannot be added to a path

The #:servlet-path argument refers to the local URL of the servlet. It  
should be a string rather than a path object. This is different to the  
#:extra-files-paths and #:mime-types-path arguments, which refer to  
paths on your local filesystem.

Say you have a servlet function that you want on the URL "http://localhost:8000/foo 
". You also have a directory called "htdocs/stylesheets" containing a  
bunch of CSS files. You might write your call to serve/servlet as  
follows:

     (serve/servlet
      start
      #:port              8000
      #:servlet-path      "/foo"
      #:extra-files-paths (list (build-path "htdocs")))

The web server sends all requests to "/foo" to your servlet and serves  
all other URLs out of your static content directory:

     http://localhost:8000/foo                    ==>    servlet
     http://localhost:8000/stylesheets/bar.css    ==>    htdocs/ 
stylesheets/bar.css
     etc...

Hope this helps,

-- Dave
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