HttpClient 4.0.1 - how to release connection? [duplicate]

Question

I have a loop over a bunch of URLs, for each one I'm doing the following:

private String doQuery(String url) {    HttpGet httpGet = new HttpGet(url);   setDefaultHeaders(httpGet); // static method   HttpResponse response = httpClient.execute(httpGet);   // httpClient instantiated in constructor    int rc = response.getStatusLine().getStatusCode();    if (rc != 200) {     // some stuff...     return;   }    HttpEntity entity = response.getEntity();    if (entity == null) {     // some stuff...     return;   }    // process the entity, get input stream etc  } 

The first query is fine, the second throws this exception:

Exception in thread "main" java.lang.IllegalStateException: Invalid use of SingleClientConnManager: connection still allocated. Make sure to release the connection before allocating another one. at org.apache.http.impl.conn.SingleClientConnManager.getConnection(SingleClientConnManager.java:199) at org.apache.http.impl.conn.SingleClientConnManager$1.getConnection(SingleClientConnManager.java:173)......

This is just a simple single-threaded app. How can I release this connection?

Answer 1

The recommended way, by Httpcomponents 4.1, is to close connection and release any underlying resources:

EntityUtils.consume(HttpEntity) 

where HttpEntity passed is a response entity.

Answer 2

This seems to work great :

      if( response.getEntity() != null ) {          response.getEntity().consumeContent();       }//if 

And don't forget to consume the entity even if you didn't open its content. For instance, you expect a HTTP_OK status from the response and don't get it, you still have to consume the entity !