Just working on getting UEM working with an application at a client, and we can see that the Dynatrace agent is getting injected into the webpage, but it appears that the first instance is returning a HTTP 408 error with the message:
HTTP/1.1 408 Request body incomplete
The request body did not contain the specified number of bytes. Got 0, expected 852
As you can see from the attached screenshot, every other .../dynatracemonitor... request after this comes across fine, but that means that we miss out on the logon.jsp in the user action purepath. We need to get this working for logon.jsp, as it is looking at the logon page, and we are trying to extract the True-Client-IP out of for geolocation mapping. Is there some reason that this first dynatracemonitor request would not be sending any payload?
I have attached the visit purepaths for this visit, Fiddler text output, and screenshot of the fiddler session.
Just as a follow-up to this: the client's app opened a window that closed quickly before the main window opened up. So the Agent was trying to communicate with the Server, but the window was gone before any data could be sent.