BE THE CODER > Tools and Libs > Commons Http Client > How to set Global Custom User-Agent Header

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 set a Global custom user agent HTTP request header instead of per request. This method is useful if you are making multiple calls through the same user agent.

File Name :	com/bethecoder/tutorials/commons_httpclient/CustomUserAgentTest2.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.commons_httpclient;



import java.io.IOException;



import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

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.params.HttpProtocolParams;



public class CustomUserAgentTest2 {



  /**

   * @param args

   * @throws IOException 

   * @throws ClientProtocolException 

   */

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

    HttpClient httpclient = new DefaultHttpClient();

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

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



    try {

      /**

       * Set 'User-Agent' header with customized string.

       */

      HttpProtocolParams.setUserAgent(httpclient.getParams(), "My Test Browser Agent");

      

      ResponseHandler<String> responseHandler = new BasicResponseHandler();

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

            

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

    } finally {

       httpclient.getConnectionManager().shutdown();

    }



  }



}