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LittleProxy is a high performance HTTP proxy written in Java and using the Netty networking framework.

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package org.littleshoot.proxy;

import io.netty.handler.codec.http.HttpRequest;
import org.littleshoot.proxy.impl.ClientDetails;

import java.util.Queue;

/**
 * 
 * Interface for classes that manage chained proxies.
 * 
 */
public interface ChainedProxyManager {

    /**
     * 
     * Based on the given httpRequest, add any {@link ChainedProxy}s to the list
     * that should be used to process the request. The downstream proxy will
     * attempt to connect to each of these in the order that they appear until
     * it successfully connects to one.
     * 
     * 
     * 
     * To allow the proxy to fall back to a direct connection, you can add
     * {@link ChainedProxyAdapter#FALLBACK_TO_DIRECT_CONNECTION} to the end of
     * the list.
     * 
     * 
     * 
     * To keep the proxy from attempting any connection, leave the list blank.
     * This will cause the proxy to return a 502 response.
     * 
     */
    void lookupChainedProxies(HttpRequest httpRequest,
                              Queue chainedProxies,
                              ClientDetails clientDetails);
}