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    <p>MercerTraieste and Tarnschaf kindly offered partial solutions to the problem. It took me a few more days, and untold hours of brain-splitting nightmare, before I gave up trying to figure out how to add a referer to the http post, and sent a new question to stackoverflow.</p> <p>Jon Skeet answered instantly that I only needed...</p> <pre><code>httppost.addHeader("Referer", referer); </code></pre> <p>...which makes me look pretty dumb. How did I overlook that one?</p> <p>Here is the resulting code, based almost entirely on MercerTraieste's suggestion. In my case, I needed to download, and place in my classpath:</p> <p><a href="http://hc.apache.org/downloads.cgi" rel="nofollow noreferrer">HttpComponents</a></p> <ul> <li>httpclient-4.0-beta2.jar</li> <li>httpcore-4.0.1.jar</li> </ul> <p><a href="http://commons.apache.org/downloads/download_logging.cgi" rel="nofollow noreferrer">Apache Commons</a></p> <ul> <li>commons-logging-1.1.1.jar</li> </ul> <hr> <pre><code>import org.apache.http.Header; import org.apache.http.HeaderElement; import org.apache.http.HttpRequestInterceptor; import org.apache.http.HttpRequest; import org.apache.http.HttpException; import org.apache.http.NameValuePair; import org.apache.http.HttpResponse; import org.apache.http.HttpEntity; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.HttpClient; import org.apache.http.protocol.HttpContext; import org.apache.http.message.BasicNameValuePair; import org.apache.http.impl.client.DefaultHttpClient; import java.util.ArrayList; import java.util.List; import java.io.OutputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; public class HttpClientTest { public static void main(String[] args) throws Exception { // initialize some variables String referer = "URL of referring web page goes here"; String submitUrl = "https URL of form action goes here"; List&lt;NameValuePair&gt; formparams = new ArrayList&lt;NameValuePair&gt;(); formparams.add(new BasicNameValuePair("firstName", "John")); formparams.add(new BasicNameValuePair("lastName", "Doe")); // set up httppost UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8"); HttpPost httppost = new HttpPost(submitUrl); httppost.setEntity(entity); // add referer httppost.addHeader("Referer", referer); // create httpclient DefaultHttpClient httpclient = new DefaultHttpClient(); // execute the request HttpResponse response = httpclient.execute(httppost); // display the response body HttpEntity responseEntity = response.getEntity(); OutputStream out = new ByteArrayOutputStream(); responseEntity.writeTo(out); System.out.println(out); } } </code></pre>
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