Non blocking drupal_http_request I am trying to integrate with a third party API using REST. I want to make a few calls to the API without waiting for the result to be back (The calls are action calls ie they perform some operation in the third party software and hence I don't need to wait in Drupal). 

In short I want to make a non blocking http call in php. (similar to asynchronous call in java-script.)

Please let me know if this is possible. 

Note : I know of httprl module. But it is not of much use as I do not want to make calls in parallel. I rather want to make a non-blocking call and then carry on with my Drupal specific actions.
No, that's not possible with drupal_http_request().

You'll need to use httprl, curl_multi, or something like that.