I have added both a new WMS and a new WFS server into a QGIS project, by specifying a generic GetCapabilities
URL in the appropriate sections in the browser panel:
After that, I am able to add some of the available layers from these WMS and WFS servers.
Now, how can I find the full corresponding underlying HTTP request (that was probably build under the hood by QGIS), so that I can copy and paste it in a web browser to get the same map?