引用：
https://github.com/adamfisk/LittleProxy
拦截和操纵HTTPS流量，LittleProxy使用中间人（MITM）管理器。 LittleProxy的默认实现（SelfSignedMitmManager）具有相当有限的功能集。 为了更好地控制证书模拟，浏览器信任，TLS握手等，请使用LittleProxy兼容的MITM扩展：
一个LittleProxy MITM扩展，旨在支持包括Android在内的所有Java平台
支持椭圆曲线加密和自定义信任存储的LittleProxy MITM扩展
要过滤HTTP流量，可以使用HttpFiltersSource（适配器）添加请求和响应过滤器，例如：
请参阅org.littleshoot.proxy.HttpFilters的Javadoc来查看您可以使用的方法。
要启用aggregator和inflater，必须在HttpFiltersSource＃get（Request / Response）BufferSizeInBytes（）方法中返回一个大于0的值。 这为您提供了一个“FullHttp（请求/响应）”，未压缩过滤器中的完整内容。 否则，你必须自己处理大块。
这个大小限制适用于每个连接。 例如，要禁止在* .iso或* dmg文件中通过URL进行聚合，您可以在过滤器源代码中返回如下所示的过滤器：
这可以在应用程序中进行大量的下载，这些应用程序定期处理大小有限的FullHttpResponses来修改其内容，例如HTML。
像LittleProxy这样的代理服务器总是包含一个Web服务器。 如果您在原始请求中获得没有方案，主机和端口的URI，那么这是对您的代理的直接请求。 您可以返回一个HttpFilters实现，它可以回答HTML内容的响应，或者像这样在clientToProxyRequest中重定向：
在回答重定向时，您应该添加一个Connection：close标头，以避免阻止行为：
<dependency><groupId>org.littleshoot</groupId><artifactId>littleproxy</artifactId><version>1.1.2</version><exclusions><exclusion><artifactId>netty-all</artifactId><groupId>io.netty</groupId></exclusion></exclusions></dependency><dependency><groupId>io.netty</groupId><artifactId>netty-all</artifactId><version>4.1.19.Final</version></dependency><dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId><version>23.6-jre</version></dependency>
package com.pc.proxy;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelPipeline;import io.netty.handler.codec.http.HttpObject;import io.netty.handler.codec.http.HttpRequest;import io.netty.handler.codec.http.HttpResponse;import org.littleshoot.proxy.HttpFilters;import org.littleshoot.proxy.HttpFiltersAdapter;import org.littleshoot.proxy.HttpFiltersSourceAdapter;import org.littleshoot.proxy.HttpProxyServerBootstrap;import org.littleshoot.proxy.impl.DefaultHttpProxyServer;public class ProxyServer { ???public static void main(String[] args) { ???????HttpProxyServerBootstrap bootstrap = DefaultHttpProxyServer.bootstrap(); ???????bootstrap.withPort(8080) ???????????????.withFiltersSource(new HttpFiltersSourceAdapter() { ???????????????????@Override ???????????????????public HttpFilters filterRequest(HttpRequest originalRequest, ChannelHandlerContext ctx) { ???????????????????????return new HttpFiltersAdapter(originalRequest) { ???????????????????????????@Override ???????????????????????????public HttpResponse clientToProxyRequest(HttpObject httpObject) { ???????????????????????????????// TODO: implement your filtering here ???????????????????????????????return new AnswerRequestFilter(originalRequest,"test").clientToProxyRequest(httpObject); ???????????????????????????} ???????????????????????????@Override ???????????????????????????public HttpObject serverToProxyResponse(HttpObject httpObject) { ???????????????????????????????// TODO: implement your filtering here ???????????????????????????????return httpObject; ???????????????????????????} ???????????????????????????@Override ???????????????????????????public void proxyToServerConnectionSucceeded(ChannelHandlerContext serverCtx) { ???????????????????????????????ChannelPipeline pipeline = serverCtx.pipeline(); ???????????????????????????????if (pipeline.get("inflater") != null) { ???????????????????????????????????pipeline.remove("inflater"); ???????????????????????????????} ???????????????????????????????if (pipeline.get("aggregator") != null) { ???????????????????????????????????pipeline.remove("aggregator"); ???????????????????????????????} ???????????????????????????????super.proxyToServerConnectionSucceeded(serverCtx); ???????????????????????????} ???????????????????????}; ???????????????????} ???????????????????@Override ???????????????????public int getMaximumResponseBufferSizeInBytes() { ???????????????????????return 10 * 1024 * 1024; ???????????????????} ???????????????}); ???????bootstrap.start(); ???}}
package com.pc.proxy;import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerContext;import io.netty.handler.codec.http.*;import org.littleshoot.proxy.HttpFiltersAdapter;import java.io.UnsupportedEncodingException;public class AnswerRequestFilter extends HttpFiltersAdapter { ???private String answer; ???public AnswerRequestFilter(HttpRequest originalRequest, String answer) { ???????super(originalRequest, null); ???????this.answer = answer; ???} ???public AnswerRequestFilter(HttpRequest originalRequest, ChannelHandlerContext ctx) { ???????super(originalRequest, ctx); ???} ???@Override ???public HttpResponse clientToProxyRequest(HttpObject httpObject){ ???????ByteBuf buffer = null; ???????try { ???????????buffer = Unpooled.wrappedBuffer(answer.getBytes("UTF-8")); ???????} catch (UnsupportedEncodingException e) { ???????????e.printStackTrace(); ???????} ???????HttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buffer); ???????HttpUtil.setContentLength(response, buffer.readableBytes());// ???????HttpHeaders.setHeader(response, HttpHeaders.Names.CONTENT_TYPE, "text/html"); ???????response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/html"); ???????return response; ???}}
高性能的HTTP代理 LittleProxy
原文地址：https://www.cnblogs.com/fofawubian/p/8386016.html