[GSS](7.1.z) UNDERTOW-1385 - url-charset="UTF-8" didn't work in ajp-listener

• • url-charset="UTF-8" didn't work in ajp-listener on EAP 7.1 CP3

After upgrade from EAP 7.1.0 to EAP 7.1 CP3, the korean character was broken.
url-charset="UTF-8" in ajp-listeneer seemded NOT work after upgrading.

• • local test

• JBCS Apache Server - mod_jk - EAP 7.1
• undertow configuration - standalone.xml
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  <subsystem xmlns="urn:jboss:domain:undertow:4.0">
  <buffer-cache name="default"/>
  <server name="default-server">
  <ajp-listener name="ajp" socket-binding="ajp" url-charset="UTF-8" record-request-start-time="true"/>
  <http-listener name="default" socket-binding="http" redirect-socket="https" enable-http2="true" record-request-start-time="true"/>
  <https-listener name="https" socket-binding="https" security-realm="ApplicationRealm" enable-http2="true"/>
  <host name="default-host" alias="localhost">
  <location name="/" handler="welcome-content"/>
  <access-log pattern="%h %l %u %t "%r" %s %b "% {i,Referer}

  " "%

  {i,User-Agent}

  " "%

  {i,COOKIE}

  " "%

  {o,SET-COOKIE}

  " %S "%I" %T"/>
  <filter-ref name="server-header"/>
  <filter-ref name="x-powered-by-header"/>
  <http-invoker security-realm="ApplicationRealm"/>
  </host>
  </server>
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1. on EAP 7.1.0

1) http://xxx.xxx.xxx.xxx:8080/webapp/한글이름_test.gif (http-listener)
[EAP access log]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.64.168.83 - - [26/Jul/2018:08:26:19 +0900] "GET /webapp/%ED%95%9C%EA%B8%80%EC%9D%B4%EB%A6%84_test.gif HTTP/1.1" 304 - "" "Mozilla/5.0 (X11; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0" "JSESSIONID=wv7uztmdyV0ljDBqmM9LN9X1I82sPIo8KY5_RDIT.localhost" "" - "default task-13" 0.008
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2) http://xxx.xxx.xxx.xxx:8888/webapp/한글이름_test.gif (ajp-listener, port 8888 is the listen port of httpd)
[EAP access log]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.64.168.83 - - [26/Jul/2018:08:26:46 +0900] "GET /webapp/한글이름_test.gif HTTP/1.1" 304 - "" "Mozilla/5.0 (X11; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0" "JSESSIONID=wv7uztmdyV0ljDBqmM9LN9X1I82sPIo8KY5_RDIT.localhost" "" - "default task-15" 0.001
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2. on EAP 7.1.3

1) http://xxx.xxx.xxx.xxx:8080/webapp/한글이름_test.gif (http-listener)
[EAP access log]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.64.168.83 - - [26/Jul/2018:08:46:59 +0900] "GET /webapp/%ED%95%9C%EA%B8%80%EC%9D%B4%EB%A6%84_test.gif HTTP/1.1" 200 - "" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36" "" "-" - "default task-3" 0.005
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2) http://xxx.xxx.xxx.xxx:8888/webapp/한글이름_test.gif (ajp-listener, port 8888 is the listen port of httpd)
[EAP access log]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.64.168.83 - - [26/Jul/2018:08:47:08 +0900] "GET /webapp/한글이름_test.gif HTTP/1.1" 404 68 "" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36" "" "-" - "default task-7" 0.004
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

3. Tested on EAP 7.1 CP1

Same issue with EAP 7.1 CP3, url-charset="UTF-8" didn't work in ajp-listener.

On EAP 7.1.1

1) http://xxx.xxx.xxx.xxx:8080/webapp/한글이름_test.gif (http-listener)
[EAP access log]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.64.168.83 - - [26/Jul/2018:08:59:49 +0900] "GET /webapp/%ED%95%9C%EA%B8%80%EC%9D%B4%EB%A6%84_test.gif HTTP/1.1" 200 - "" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36" "" "-" - "default task-3" 0.006
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2) http://xxx.xxx.xxx.xxx:8888/webapp/한글이름_test.gif (ajp-listener, port 8888 is the listen port of httpd)
[EAP access log]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.64.168.83 - - [26/Jul/2018:08:59:58 +0900] "GET /webapp/한글이름_test.gif HTTP/1.1" 404 68 "" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36" "" "-" - "default task-7" 0.005
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~