After upgrading Jenkins from 2.249.2 to 2.277.3, webhooks being fired from github enterprise by way of the ghrpb started randomly failing with errors indicating that the payload was missing from the request. Messages were similar to below:

SEVERE: Request doesn't contain payload. You are sending url encoded request, so you should pass github payload through 'payload' request parameter

We saw similarly worded errors coming from the Github plugin as well.

I believe I've traced the failure to this issue in Jetty which looks like it's been corrected with this PR

The underlying error was exposed after enabling Jenkins logging on jetty:

May 12, 2021 11:34:33 AM FINE org.eclipse.jetty.server.HttpConnection fillRequestBuffer
javax.net.ssl.SSLHandshakeException: Encrypted buffer max length exceeded

Which further down in the stack indicated it was bubbling up from ghprb:

org.jenkinsci.plugins.ghprb.GhprbRootAction.extractRequestBody(GhprbRootAction.java:286)