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Rapidoid HTTP Server
There is a newer version: 5.5.5
package org.rapidoid.reverseproxy;

import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.concurrent.Callback;
import org.rapidoid.http.*;
import org.rapidoid.http.impl.lowlevel.HttpIO;
import org.rapidoid.job.Jobs;
import org.rapidoid.log.LogLevel;
import org.rapidoid.u.U;
import org.rapidoid.util.Msc;

import java.io.IOException;
import java.net.ConnectException;
import java.util.Map;

/*
 * #%L
 * rapidoid-http-server
 * %%
 * Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

@Authors("Nikolche Mihajlovski")
@Since("5.2.0")
public class ReverseProxy extends AbstractReverseProxyBean implements ReqRespHandler {

	private final ProxyMapping mapping;

	public ReverseProxy(ProxyMapping mapping) {
		this.mapping = mapping;
	}

	@Override
	public Object execute(final Req req, final Resp resp) throws Exception {

		ProxyMapping mapping = findMapping(req);
		if (mapping == null) return null; // not found!

		req.async();

		process(req, resp, mapping, 1, U.time());

		return req;
	}

	protected ProxyMapping findMapping(Req req) {
		return mapping; // customizable for more complex logic
	}

	private void process(final Req req, final Resp resp, final ProxyMapping mapping, final int attempts, final long since) {
		final String targetUrl = mapping.getTargetUrl(req);

		Map headers = U.map(req.headers());

		headers.remove("transfer-encoding");
		headers.remove("content-length");

		addExtraRequestHeaders(req, headers);

		HttpClient client = getOrCreateClient();

		client.req()
			.verb(req.verb())
			.url(targetUrl)
			.headers(headers)
			.cookies(req.cookies())
			.body(req.body())
			.raw(true)
			.execute(new Callback() {

				@Override
				public void onDone(HttpResp result, Throwable error) {
					if (error == null) {

						resp.code(result.code());
						resp.body(result.bodyBytes());

						// process the response headers
						SimpleHttpResp proxyResp = new SimpleHttpResp();
						HttpUtils.proxyResponseHeaders(result.headers(), proxyResp);

						if (proxyResp.contentType != null) resp.contentType(proxyResp.contentType);
						if (proxyResp.headers != null) resp.headers().putAll(proxyResp.headers);
						if (proxyResp.cookies != null) resp.cookies().putAll(proxyResp.cookies);

						resp.done();

					} else {
						handleError(error, req, resp, mapping, attempts, since);
					}
				}

			});
	}

	private void addExtraRequestHeaders(Req req, Map headers) {
		String clientIpAddress = req.clientIpAddress();

		if (setXUsernameHeader()) headers.put("X-Username", U.safe(Current.username()));

		if (setXRolesHeader()) headers.put("X-Roles", U.join(", ", Current.roles()));

		if (setXClientIPHeader()) headers.put("X-Client-IP", clientIpAddress);

		if (setXRealIPHeader()) headers.put("X-Real-IP", req.realIpAddress());

		if (setXForwardedForHeader()) {
			String forwardedFor = headers.get("X-Forwarded-For");

			if (U.notEmpty(forwardedFor)) {
				forwardedFor += ", " + clientIpAddress;
			} else {
				forwardedFor = clientIpAddress;
			}

			headers.put("X-Forwarded-For", forwardedFor);
		}
	}

	private void handleError(Throwable error, final Req req, final Resp resp, final ProxyMapping mapping, final int attempts, final long since) {
		if (error instanceof ConnectException || error instanceof IOException) {

			if (HttpUtils.isGetReq(req) && !Msc.timedOut(since, timeout())) {

				Jobs.after(retryDelay()).milliseconds(new Runnable() {
					@Override
					public void run() {
						process(req, resp, mapping, attempts + 1, since);
					}
				});

			} else {
				HttpIO.INSTANCE.errorAndDone(req, U.rte("Couldn't connect to the upstream!", error), LogLevel.DEBUG);
			}

		} else {

			HttpIO.INSTANCE.errorAndDone(req, error, LogLevel.ERROR);
		}
	}

	@Override
	protected HttpClient createClient() {
		return HTTP.client()
			.reuseConnections(reuseConnections())
			.keepCookies(false)
			.maxConnTotal(maxConnections())
			.maxConnPerRoute(maxConnectionsPerRoute());
	}

}