From the URL you can execute a .4ae program without problem unless 
it connects to database an requires environment variables set.

So the usual method is to call a shell launcher.

html_report

    Generate a simple list of table sof the test1 database, read from
    systables columns tabid and tabname.

List of files:

    html_report.4gl  The main program of the aplication

    ahtmllib.4gl     The library of reusable functions

    html_report.mk   amake specification file

    html_report      The shell called in the URL. This simple set the
                     environment and executes htl_report.4ae

How to test

$ lf
CVS/  README  ahtmllib.4gl  html_report*  html_report.4gl  html_report.mk
$ amake
Amake: aMaking html_report.mk in /opt/aubit/aubit4glsrc/tools/test/html
/bin/sh aubit 4glc ahtmllib.4gl -c -o ahtmllib.ao
/bin/sh aubit 4glc html_report.4gl -c -o html_report.ao
/bin/sh aubit 4glc ahtmllib.ao html_report.ao -o html_report.4ae
$ cp html_report.4ae html_report /var/www/cgi-bin/
cp: overwrite `/var/www/cgi-bin/html_report.4ae'? y
cp: overwrite `/var/www/cgi-bin/html_report'? y

In a web browser go to http://localhost/cgi-bin/html_report

Chose the output format you want and click on 'report'