BE THE CODER > Tools and Libs > Commons Http Client

Commons Http Client is a HTTP agent implementation in java supporting client-side authentication, HTTP state management and HTTP connection management. This requires the libraries httpclient-4.1.2.jar, httpcore-4.1.2.jar, httpmime-4.1.2.jar, httpclient-cache-4.1.2.jar, commons-codec.jar and commons-logging-1.1.1.jar to be in classpath. The following example shows how to create a request Interceptor.

File Name :	com/bethecoder/tutorials/commons_httpclient/RequestInterceptorTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.commons_httpclient;



import java.io.IOException;

import java.util.Date;



import org.apache.http.HttpException;

import org.apache.http.HttpRequest;

import org.apache.http.HttpRequestInterceptor;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.ResponseHandler;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.BasicResponseHandler;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.protocol.HttpContext;



public class RequestInterceptorTest {



  /**

   * @param args

   * @throws IOException 

   * @throws ClientProtocolException 

   */

  public static void main(String[] args) throws ClientProtocolException, IOException {

    DefaultHttpClient httpclient = new DefaultHttpClient();

    HttpGet httpget = new HttpGet("http://localhost:8080/HTTP_TEST_APP/print_headers.jsp");

    System.out.println("Requesting : " + httpget.getURI());



    try {

      httpclient.addRequestInterceptor(new HttpRequestInterceptor() {

        

        @Override

        public void process(HttpRequest request, HttpContext context)

            throws HttpException, IOException {

          

          request.addHeader("Author", "Sudhakar KV");

          request.addHeader("Triggered-On", new Date().toString());

          

          String agent = request.getFirstHeader("User-Agent").getValue();

          request.addHeader("User-Agent-US", agent.toUpperCase());

        }

      });

      

      ResponseHandler<String> responseHandler = new BasicResponseHandler();

            String responseBody = httpclient.execute(httpget, responseHandler);

            

      System.out.println("responseBody : " + responseBody);

    } finally {

       httpclient.getConnectionManager().shutdown();

    }



  }



}

How to add Request Interceptor