sending a non-blocking HTTP POST request

php python nonblocking
pablo picture pablo · Oct 12, 2009 · Viewed 11.9k times · Source

I have a two websites in php and python. When a user sends a request to the server I need php/python to send an HTTP POST request to a remote server. I want to reply to the user immediately without waiting for a response from the remote server.

Is it possible to continue running a php/python script after sending a response to the user. In that case I'll first reply to the user and only then send the HTTP POST request to the remote server.

Is it possible to create a non-blocking HTTP client in php/python without handling the response at all?

A solution that will have the same logic in php and python is preferable for me.

Thanks

Answer

ntd picture ntd · Oct 12, 2009

In PHP you can close the connection by sending this request (this is HTTP related and works also in python, although I don't know the proper syntax to use):

// Send the response to the client
header('Connection: Close');
// Do the background job: just don't output anything!

Addendum: I forgot to mention you probably have to set the "Context-Length". Also, check out this comment for tips and a real test case.

Example:

<?php    
ob_end_clean();
header('Connection: close');

ob_start();

echo 'Your stuff goes here...';

header('Content-Length: ' . ob_get_length());

ob_end_flush();
flush();

// Now we are in background mode
sleep(10);
echo 'This text should not be visible';    
?>

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