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.
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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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