java - 通过 littleproxy 创建反向代理

Question

我是初学者littleproxy，如何创建反向代理服务器？

我的代理从客户端获取请求并将它们发送到服务器（服务器仅与 www.xxx.com 相同的常规站点仅包含网页（不休息），代理从服务器（网页）获取响应并返回给客户端。

例如，客户端 url 是localhost:8080/x，代理将其映射到客户端www.myserver.com/xy并显示xy页面。如何通过使用过滤器或 httpservlet 来做到这一点。

我的 http servlet 如下：

 public class ProxyFilter implements Filter {
      public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) req;

        HttpProxyServer server =
        DefaultHttpProxyServer.bootstrap()
        .withPort(8080)
        .withFiltersSource(new HttpFiltersSourceAdapter() {
            public HttpFilters filterRequest(HttpRequest originalRequest, ChannelHandlerContext ctx) {
               return new HttpFiltersAdapter(originalRequest) {
                  @Override
                  public HttpResponse clientToProxyRequest(HttpObject httpObject) {
                      // TODO: implement your filtering here ????
                      return null;
                  }

                  @Override
                  public HttpResponse proxyToServerRequest(HttpObject httpObject) {
                      // TODO: implement your filtering here ????
                      return null;
                  }

                  @Override
                  public HttpObject serverToProxyResponse(HttpObject httpObject) {
                      // TODO: implement your filtering here ????
                      return httpObject;
                  }

                  @Override
                  public HttpObject proxyToClientResponse(HttpObject httpObject) {
                      // TODO: implement your filtering here ????
                      return httpObject;
                  }   
               };
            }
        })
        .start();
    }
    public void init(FilterConfig config) throws ServletException {

    }
    public void destroy() {

    }
}

Answer 1

LittleProxy 使用Host标头进行路由。因此，您可以做的最简单的事情就是Host在方法中设置为真正的服务器clientToProxyRequest。

    公共 HttpResponse clientToProxyRequest(HttpObject httpObject) {
        if(httpObject instanceof FullHttpRequest) {
            FullHttpRequest httpRequest = (FullHttpRequest)httpObject;
            httpRequest.headers().remove("主机");
            httpRequest.headers().add("主机", "myserver.com:8080");
        }
        返回空值；
    }