ability to add 'host_name' extension for SNI in netty

[gollapa]

When making oubound rest calls we have a requirement to use the NAT IP address instead of the actual host name. When making such calls for SNI enabled servers currently we would need a provision to set server_name in the request for the TLS /SSL handshake to pass.

Currently if the request is made using IP address server_name is not passed in the extension.

An ability to use the HOST name header to inject host_name in the SNI extension can be evaluated as follows . Currently the SNI is derived from the request uri as requestUri.getHost() in NettyConnector.

Following code resolved setting Sni using host name header set in the request:

if((nettyRequest.headers().contains("Host"))) {
hdr = nettyRequest.headers().get(HttpHeaderNames.HOST);
}
SslHandler sslHandler = jdkSslContext.newHandler(ch.alloc(),hdr==null? requestUri.getHost():hdr,
(port <= 0) ? 443 : port, NettyConnector.this.executorService);

[gollapa]

any update?we are using jersey with netty connector version 2.37