Several java proxy servlet tool

HTTP-Proxy-Servlet

The tool is relatively simple, it can be configured, or code way https://github.com/mitre/HTTP-Proxy-Servlet

• servlet configuration

<servlet>

  <servlet-name>clusterProxy</servlet-name>

  <servlet-class>org.mitre.dsmiley.httpproxy.URITemplateProxyServlet</servlet-class>

  <init-param>

    <param-name>targetUri</param-name>

    <param-value>http://{_subHost}.behindfirewall.mycompany.com:{_port}/{_path}</param-value>

  </init-param>

  <init-param>

    <param-name>log</param-name>

    <param-value>true</param-value>

  </init-param>

</servlet>

​

<servlet-mapping>

  <servlet-name>clusterProxy</servlet-name>

  <url-pattern>/mywebapp/cluster/*</url-pattern>

</servlet-mapping>

• spring boot code that way

@Configuration

public class SolrProxyServletConfiguration implements EnvironmentAware {

​

  @Bean

  public ServletRegistrationBean servletRegistrationBean(){

    ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new ProxyServlet(), propertyResolver.getProperty("servlet_url"));

    servletRegistrationBean.addInitParameter(ProxyServlet.P_TARGET_URI, propertyResolver.getProperty("target_url"));

    servletRegistrationBean.addInitParameter(ProxyServlet.P_LOG, propertyResolver.getProperty("logging_enabled", "false"));

    return servletRegistrationBean;

  }

​

  private RelaxedPropertyResolver propertyResolver;

​

  @Override

  public void setEnvironment(Environment environment) {

    this.propertyResolver = new RelaxedPropertyResolver(environment, "proxy.solr.");

  }

}

  

yaml Configuration

proxy:

    solr:

        servlet_url: /solr/*

        target_url: http://solrserver:8983/solr

 

 

Jetty's ProxyServlet:

This is also the most complete realization of a more complex
https://www.eclipse.org/jetty/documentation/9.4.x/proxy-servlet.html

netflix zuul

Technical spring cloud netflix zuul gateway used https://github.com/Netflix/zuul , currently it includes two versions 1.x and 2 the difference is quite big
way different filter stages of processing zuul very good, more flexible

charon-spring-boot-starter

Function is very wide, very convenient a tool
https://github.com/mkopylec/charon-spring-boot-starter/wiki

• Simple to use

 

import static com.github.mkopylec.charon.configuration.CharonConfigurer.charonConfiguration;

import static com.github.mkopylec.charon.configuration.RequestMappingConfigurer.requestMapping;

import static com.github.mkopylec.charon.forwarding.interceptors.rewrite.RequestServerNameRewriterConfigurer.requestServerNameRewriter;

​

@Configuration

class CharonConfiguration {

​

    @Bean

    CharonConfigurer charonConfigurer () {

        return charonConfiguration()

                .set(requestServerNameRewriter().outgoingServers("host1:8080", "host2:8081"))

                .add(requestMapping("all requests mapping"));

    }

}