Without more information, my guess is you're using the script/myapp_server.pl and you're running it in single threaded mode.

Use the -fork option to script/myapp_server.pl so that the server can serve more than one request at a time, or more preferentially use a forking web server like mod_perl or something similar.

and/or

Create a job queue for the functionality that happens in check_result and then somehow poll the server for job completion (perhaps using AJAX).