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Steps to Reproduce:

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1. Deploy attached war.
2. curl -v -X POST localhost:8080/files/empty — expected response code is 444, correct
3. curl -v localhost:8080/files/empty — the expected response code is 555, but actual response code is 200 OK

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1. Deploy attached war. 2. curl -v -X POST localhost:8080/files/empty — expected response code is 444, correct 3. curl -v localhost:8080/files/empty — the expected response code is 555, but actual response code is 200 OK
Git Pull Request:
https://github.com/wildfly/wildfly/pull/11023

When this expression

equals(%m, 'POST') -> { response-code(444) } else { response-code(555) }

is put into "undertow-handlers.conf", and the predicate is false, the returned response code is 200, like the false branch was ignored.

The handler for the false branch is set to RewriteCorrectingHandlerWrapper.

This behavior is different when the same expression is configured via expression filter in undertow subsystem.

Contents of files.war:

/empty
/not-empty
/WEB-INF/undertow-handlers.conf