Hello, there is a problem with charset resolution from ContentType header for SOAP 1.2 using io.netty.handler.codec.http.HttpUtils class. SOAP 1.2 could have action parameter in ContentType header and method getCharsetAsSequence(CharSequence contentTypeValue) from io.netty.handler.codec.http.HttpUtils class just finds charset word and take whole string from this word end to the end.

Expected behavior

Resolve charset from ContentType header with value text/xml; charset=utf-8; action="someaction" as UTF-8

Actual behavior

Resolve charset substring from ContentType header with value text/xml; charset=utf-8; action="someaction" as utf-8; action="someaction". And then you will get an exception java.nio.charset.IllegalCharsetNameException

Steps to reproduce

Resolve charset from any request which contains action parameter in ContentType header value

Netty version

4.1.19

JVM version (e.g. java -version)

java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)

OS version (e.g. uname -a)

Linux 4.15.0-33-generic Ubuntu 18