HttpClient doesn't send HOST header when tunelling HTTP/1.1 through http proxy

Issue

• We confirmed Client HTTP request header but there is not include host header in the request header.

# cat JI9060201.java
import java.net.http.*;
import java.net.*;
import java.io.*;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;

public class JI9060201 {
    private final static Logger log = Logger.getLogger(JI9060201.class.getName());
    static {
         try {
             LogManager.getLogManager().readConfiguration(new FileInputStream("/etc/tomcat/logging.properties"));
         } catch (SecurityException | IOException e1) {
             e1.printStackTrace();
         }
    }

    public static void main(String[] args) throws Exception {
         var httpResponse = HttpClient.newBuilder()
                    .proxy(ProxySelector.of(new InetSocketAddress("localhost", 3128)))
                    .build()
                    .send(HttpRequest.newBuilder(URI.create("https://www.google.com/"))
                            .build(), HttpResponse.BodyHandlers.ofString());
            assert httpResponse.statusCode() == HttpURLConnection.HTTP_OK;

    }

}

#/usr/lib/jvm/java-11-openjdk-11.0.7.10-4.el7_8.x86_64/bin/java JI9060201

#/var/squid/cache.log
..snip..
2020/08/17 04:23:25.235 kid1| 11,2| client_side.cc(2348) parseHttpRequest: HTTP Client REQUEST:
---------
CONNECT www.google.com:443 HTTP/1.1^M
^M

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..snip..