How Can I Handle Large File Downloads and ZIP Streaming in Slim 4 Without Output Buffering Issues?

I’m working with Slim 4 and need to deliver large files, including dynamically generated ZIP archives, to users efficiently. While testing, I’ve encountered concerns related to output buffering, memory consumption, and response performance when streaming large amounts of data.

I’m looking for the best approach to stream files and ZIP content directly to the client without loading everything into memory first. Has anyone implemented large file downloads or real-time ZIP streaming in Slim 4? I’d appreciate recommendations on middleware configuration, response handling, and techniques for avoiding buffering-related bottlenecks during file transfers.

Hi!

Some time ago I wrote a library to address this issue of sending large (ZIP) files.

This library also contains a CallbackStream class to send streams “on the fly”.

Depending on you specific use case you may find a working solution with it: