What happens to the application if the client closes HTTP connections without waiting for a response?

Question

Computer networks

Does the script run to the end or does it stop?

Answer 1

It strongly depends on the server used and the technology stack in general. In most cases, acc. the engine thread will end on a timeout (no one wants to execute the task of a client that has fallen off) or on the corresponding callback (if the application registered it).
Here is an example for PHP:
www.php.net/manual/en/features.connection-handling.php