如何设置自定义用户代理与Apache HTTP客户端库4.1？

如何使HTTPClient使用自定义User-Agent头？如何设置自定义用户代理与Apache HTTP客户端库4.1？

以下代码提交空的用户代理。我错过了什么？

import java.io.IOException; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.params.CoreProtocolPNames; 
import org.apache.http.protocol.BasicHttpContext; 
import org.apache.http.protocol.HttpContext; 
import org.apache.http.util.EntityUtils; 

public class TestHTTP { 

     public static void main(String[] args) throws ClientProtocolException, IOException { 
     HttpGet request = new HttpGet("http://tool.keepmeapi.com/echo"); 

     HttpContext HTTP_CONTEXT = new BasicHttpContext(); 
     HTTP_CONTEXT.setAttribute(CoreProtocolPNames.USER_AGENT, "Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101206 Ubuntu/10.10 (maverick) Firefox/3.6.13"); 
     request.setHeader("Referer", "http://www.google.com"); 

     HttpClient httpClient = new DefaultHttpClient(); 
     HttpResponse response = httpClient.execute(request, HTTP_CONTEXT); 

     if (response.getStatusLine().getStatusCode() < 200 || response.getStatusLine().getStatusCode() >= 400) { 
      throw new IOException("Got bad response, error code = " + response.getStatusLine().getStatusCode()); 
     } 

     HttpEntity entity = response.getEntity(); 
     if (entity != null) { 
      System.out.println(EntityUtils.toString(entity)); 
      EntityUtils.consume(entity); 
     } 
    } 

}

来源

2011-02-17 Maxim Veksler

线

request.setHeader("User-Agent", "MySuperUserAgent");

丢失。添加并享受。

来源

2011-02-17 10:15:49 AlexR

这么简单.. 。:)我不知道CoreProtocolPNames.USER_AGENT是什么？ – 2011-02-17 10:26:18

我不知道。我没有这个班，但可能它只是一个不断的“用户代理”？ – AlexR 2011-02-17 10:29:02

您还可以设置一个全球性的用户代理值，而不是每个请求：

String userAgent = "NewUseAgent/1.0"; 
HttpClient httpClient = new DefaultHttpClient(); 
httpclient.getParams().setParameter(CoreProtocolPNames.USER_AGENT, userAgent);

来源

2012-01-29 00:59:12

随着httpcomponents 4.3，你应该使用客户端生成器来设置用户代理：

HttpClient httpClient = HttpClients.custom() 
          .setUserAgent("my UserAgent 5.0") 
          .build(); 

httpClient.execute(new HttpGet("http://www.google.de"));

来源

2013-12-16 16:18:47 MrSpock

如何设置自定义用户代理与Apache HTTP客户端库4.1？

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