Be it for troubleshooting purposes or more simply to keep track of all the web request routed to your 4D Web server, 4D/4D Server/4D Client can create a document that stores all the web requests it received.
To enable the creation of the logweb.txt file:
1- In the Design environment, open the Preferences.
2- Open the Web/Advanced page.
3- Select the option Save request in file.
From then on, every requests that 'hits' the 4D Web Server will be logged in the logweb.txt file.