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The Async Http Client (AHC) classes.

There is a newer version: 3.0.0

package org.asynchttpclient.channel;

import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpUtil;
import org.asynchttpclient.Request;

import static io.netty.handler.codec.http.HttpHeaderValues.CLOSE;

/**
 * Connection strategy implementing standard HTTP 1.0/1.1 behavior.
 */
public class DefaultKeepAliveStrategy implements KeepAliveStrategy {

  /**
   * Implemented in accordance with RFC 7230 section 6.1 https://tools.ietf.org/html/rfc7230#section-6.1
   */
  @Override
  public boolean keepAlive(Request ahcRequest, HttpRequest request, HttpResponse response) {
    return HttpUtil.isKeepAlive(response)
            && HttpUtil.isKeepAlive(request)
            // support non standard Proxy-Connection
            && !response.headers().contains("Proxy-Connection", CLOSE, true);
  }
}