HttpServletRequest#getServerName always returns 0.0.0.0 when using new performant HTTP connector

[ryantgraham]

We've found what we believe to be an issue where calls to HttpServletRequest#getServerName when the new performant HTTP connector has been enabled is returning a different value when it is not enabled.

With the connector not enabled the value would be along the lines of:
{version}.appspot.com

With the connector enabled it always returns:
0.0.0.0

This can be reproduced using the Google App Engine Standard Environment Samples for Java 17 Bundled Services sample application and logging the output of the call to HttpServletRequest#getServerName in one of the servlets.

[ludoch]

Thanks for the report.

Maybe a regression in

appengine-java-standard/runtime/runtime_impl_jetty9/src/main/java/com/google/apphosting/runtime/jetty9/JettyRequestAPIData.java

Line 339 in 63b450d

public String getServerName() {

via a9e0ea5 ?

[maigovannon]

@ludoch I think the issue might be the right one a54e790 since the a9e0ea5 was a field change.

[lachlan-roberts]

Yes looks like its from #311.

I will open a PR to fix the issue and increase the coverage from the test cases.