How can file_get_contents failed to open stream: HTTP request failed on successful request?

Question

PHP

Hello.

When adding a large file (more than 1.5 GB) to the outgoing server (also our own), an error occurs file_get_contents failed to open stream: HTTP request failed

The essence of the script:
The file is loaded in 20 MB chunks. Everything is super with small files.

When uploading a large file: everything is also super, the file is loaded without problems, the line is loaded (where our file_get_contents request occurs) fulfills the request -> the file server accepts the request -> does all the necessary operations. It remains to get a response, but file_get_contents failed to open stream: HTTP request failed.

The script needs a successful response in order to complete its work. The work was completed successfully, but what answer did I write above.

All possible restrictions in php, ngixn and others have been removed. I've been fiddling with this problem for a day now, I'll be grateful for any hint..

Laravel framework, maybe this could be the reason.