IllegalCharsetNameException when forwarding request

Issue

• We see the following exception when forwarding the request on EAP 7:

Caused by: java.nio.charset.IllegalCharsetNameException:
        at java.nio.charset.Charset.checkName(Charset.java:303)
        at java.nio.charset.Charset.lookup2(Charset.java:484)
        at java.nio.charset.Charset.lookup(Charset.java:464)
        at java.nio.charset.Charset.forName(Charset.java:528)
        at io.undertow.servlet.spec.ServletPrintWriter.createEncoder(ServletPrintWriter.java:64)
        at io.undertow.servlet.spec.ServletPrintWriter.<init>(ServletPrintWriter.java:59)
        at io.undertow.servlet.spec.HttpServletResponseImpl.getWriter(HttpServletResponseImpl.java:359)
        at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:152)
        at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImpl(RequestDispatcherImpl.java:211)
        ... 53 more