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Steps to Reproduce:
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We setup a reproduce case using

set(attribute='%{o,test-header}', value='foo\'bar')

and this was the result

test-header: foo\'bar

when the expected output must be

test-header: foo'bar

in the response headers the backslash escapes the quote but Undertow fails to remove the backslash character from the final string.
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We setup a reproduce case using set(attribute= '%{o,test-header}' , value= 'foo\' bar') and this was the result test-header: foo\'bar when the expected output must be test-header: foo'bar in the response headers the backslash escapes the quote but Undertow fails to remove the backslash character from the final string.
Release Note Text:
Undefined
Git Pull Request:
https://github.com/undertow-io/undertow/pull/1164, https://github.com/undertow-io/undertow/pull/1440

This was found using CommandBox CLI's integration with Undertow.

duplicates

UNDERTOW-2163 Predicate Language cannot set attribute to empty string

is incorporated by

UNDERTOW-2163 Predicate Language cannot set attribute to empty string