use host header to fill undertow http tags #4439
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What Does This Do
Fix the way undertow instrumentation is filling http related tag. Host and port are today taken from the socket that has been bound. This differs the way we do on other instrumentations (like tomcat).
The correct thing should be to take what has been put in the host header of the request (like tomcat is doing).
Tested with spring boot and undertow (calling a host alias my.local.address):
Today:
With this fix:
Motivation
Additional Notes