JAVA HTTP反向代理实现过程详解

<dependency>
  <groupId>org.mitre.dsmiley.httpproxy</groupId>
  <artifactId>smiley-http-proxy-servlet</artifactId>
  <version>1.11</version>
</dependency>

# 设置代理
proxy:
 servlet_url: /webappB/*
 target_url: https://webappB_HOST_IP:8001/webappB其他demo
 # servlet_url: /proxybaidu/*
 # target_url: https://www.baidu.com

@Configuration
public class ProxyServletConfiguration {
  /**
   * 读取配置文件中路由设置
   */
  @Value("${proxy.servlet_url}")
  private String servlet_url;
  /**
   * 读取配置中代理目标地址
   */
  @Value("${proxy.target_url}")
  private String target_url;

  @Bean
  public Servlet createProxyServlet() {
    /** 创建新的ProxyServlet */
    return new ProxyServlet();
  }

  @Bean
  public ServletRegistrationBean proxyServletRegistration() {
    ServletRegistrationBean registrationBean = new ServletRegistrationBean(createProxyServlet(), servlet_url);
    //设置网址以及参数
    Map<String, String> params = ImmutableMap.of("targetUri", target_url, "log", "true");
    registrationBean.setInitParameters(params);
    return registrationBean;
  }
}

@Override
  protected HttpResponse (HttpServletRequest servletRequest, HttpServletResponse servletResponse,
                   HttpRequest proxyRequest) throws IOException {　　　　　　　　　　//设置header里的授权信息
    proxyRequest.setHeader("Authorization", "Basic " + getWebappBLoginAuth());
    HttpResponse response = super.doExecute(servletRequest, servletResponse, proxyRequest);

//    设置跨域，暂时不用。
//    String origin = servletRequest.getHeader("origin");
//    response.setHeader("Access-Control-Allow-Origin", origin);
//     response.setHeader("Access-Control-Allow-Credentials", "true");
//    response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
//    response.setHeader("Access-Control-Allow-Headers",
//        "Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin" +
//            ",User-Agent,X-Mx-ReqToken,X-Requested-With");
    return response;
  }