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From "Michael Andersen (JIRA)" <j...@apache.org>
Subject [jira] Created: (HTTPCLIENT-795) If there is more than 15 seconds between HttpClient.execute() calls using a MultipartEntity, a ProtocolException is thrown complaining about the Content-Length header already being present.
Date Tue, 09 Sep 2008 11:33:44 GMT
If there is more than 15 seconds between HttpClient.execute() calls using a MultipartEntity,
a ProtocolException is thrown complaining about the Content-Length header already being present.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: HTTPCLIENT-795
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-795
             Project: HttpComponents HttpClient
          Issue Type: Bug
          Components: HttpClient
    Affects Versions: 4.0 Alpha 4
         Environment: Linux, java version "1.6.0_06" Java(TM) SE Runtime Environment (build
1.6.0_06-b02) Java HotSpot(TM) Client VM (build 10.0-b22, mixed mode). Also using HttpCore-4.0-beta2
            Reporter: Michael Andersen


I am not sure if this time-related behaviour is intentional or not (I have only been using
this library for a few weeks) , but even if a timeout is to be expected, the exception thrown
ought to indicate that there is a time component involved. "org.apache.http.ProtocolException:
Content-Length header already present" is incredibly misleading. 

A simple-ish compileable program to reproduce the bug is as follows:

import java.nio.charset.Charset;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.params.ClientPNames;
import org.apache.http.client.params.CookiePolicy;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
public class Simple {
    static public void main(String [] args)
    {
        try
        {
            DefaultHttpClient client = new DefaultHttpClient();
            client.getParams().setParameter(
                        ClientPNames.COOKIE_POLICY, CookiePolicy.BROWSER_COMPATIBILITY);
            MultipartEntity entity;
            StringBody stringBody;
            HttpPost post;
            HttpResponse response;
            entity = new MultipartEntity();
            stringBody = new StringBody("field contents",Charset.forName("ISO-8859-1"));
            entity.addPart("field", stringBody);  
            post = new HttpPost("http://localhost/simple.php");
            post.setEntity(entity); 
            response = client.execute(post);
            
            //The exception does not occur if the content is not consumed
            response.getEntity().consumeContent();
            System.out.println("First post done");
            
            //The exception does not occur if the time interval between the requests is too
short
            Thread.sleep(15000);
            
            //The exception naturally doesn't occur if a new HttpClient is created
            //client = new DefaultHttpClient();

            entity = new MultipartEntity();
            stringBody = new StringBody("field contents",Charset.forName("ISO-8859-1"));
            entity.addPart("field", stringBody);  

            post = new HttpPost("http://localhost/simple.php");
            post.setEntity(entity); 
            response = client.execute(post); //Will throw the following:
            /*
                org.apache.http.ProtocolException: Content-Length header already present
                at org.apache.http.protocol.RequestContent.process(RequestContent.java:70)
                at org.apache.http.protocol.BasicHttpProcessor.process(BasicHttpProcessor.java:290)
                at org.apache.http.protocol.HttpRequestExecutor.preProcess(HttpRequestExecutor.java:160)
                at org.apache.http.impl.client.DefaultClientRequestDirector.execute(DefaultClientRequestDirector.java:356)
                at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:501)
                at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:456)
                at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:422)
                at test.Simple.main(Simple.java:57)
             */ 
            System.out.println("Second post done");
        }
        catch(Exception e)
        {
            System.out.println(e);
            e.printStackTrace();
        }
    }    
}

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