Wapp

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    https://wapp.tcl.tk/demo/env.tcl/abc/def/ghi?a=5&b=22.425#point42
    \___/   \_________/ \______________________/ \__________/ \_____/
      |          |              |                     |          |
    scheme   authority        path                  query      fragment


Assuming that /demo/env.tcl is the script that implements the application,
tradition CGI and SCGI, and Wapp, break a URL down like this:
traditional CGI and SCGI provide the following breakdown:

>
    https://wapp.tcl.tk/demo/env.tcl/abc/def/ghi?a=5&b=22.425#point42
            \_________/ \__________/\__________/
                 |           |          |
             HTTP_HOST  SCRIPT_NAME  PATH_INFO
            \_________/ \__________/\__________/ \__________/
                 |           |          |             |
             HTTP_HOST  SCRIPT_NAME  PATH_INFO   QUERY_STRING

Wapp provides additional variables not found in traditional CGI:
>

>
                SELF_URL
     ______________|___________________
    /                                  \
    https://wapp.tcl.tk/demo/env.tcl/abc/def/ghi?a=5&b=22.425#point42
    \______________________________/ \_/ \_____/
                   |                  |     |
                BASE_URL         PATH_HEAD  '-- PATH_TAIL     

>
    https://wapp.tcl.tk/demo/env.tcl/abc/def/ghi?a=5&b=22.425#point42
    \__________________________________/         \__________/
                   |                                  |
                SELF_URL                         QUERY_STRING


2.0 URL Mapping
---------------

The URL Mapper is the function that determines which routine in the
application should handle an HTTP request based on the URL.  In Wapp,
the default URL Mapper simply looks at PATH\_HEAD and invokes the
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