My idea is to enable access logging for the Application Web Server.
In this way access to a web service can be analyzed which is also useful in debugging timing or performance problems of your application. To facilitate easy analysis, industry standards like the "common log format" or "combined log format" (link) should be used, then analyzer tools like AWStats can be used. The Appweb Embedded Web Server, which is the core of the Application web server, does already support logging so getting this running should be easy.
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