400 Bad Request - Virtual Host

Question

I'm receiving "400 Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit." I am trying to load a page that is configured with Virtual Host Tomcat 9. My configured Virtual Host:

 <Host name="demonstracao.itcmedb.com" appBase="demonstracao"
            unpackWARs="true" autoDeploy="true">
        <Allias>www.demonstracao.itcmedbr.com</Allias>
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log" suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
       <Context path="" docBase="/opt/tomcat/webapps/demonstracao"
          debug="0" reloadable="true"/>
      </Host>
I've too in http.conf configuration:
LimitRequestFieldSize 200000
Timeout 2400
ProxyTimeout 2400
ProxyBadHeader Ignore

ProxyPass               /demonstracao.itcmedbr.com      http://localhost:8081/demonstracao.itcmedbr.com
ProxyPassReverse        /demonstracao.itcmedbr.com      http://localhost:8081/demonstracao.itcmedbr.com

I'll appreciate any assistance, thanks.