[Question] Routing of the requests with multipart file upload limitations

Describe the bug
Please provide details of the problem, including the version of Spring Cloud that you are using.

I've encountered multiple issues with file uploads in my own project. There are numerous open issues within different components, such as netty, reactor-netty, and within this repository, related to memory leaks and Direct Buffers OOMs, I've also faced with few but it is a another topic.

So the fundamental question is: Could Spring Cloud Gateway theoretically handle routing a request with multipart files when the total size at some point exceeds the RAM of the container? Or does it require storing data in memory until the upload to the gateway completes, after which the data will be downstreamed to service B?

In my current scenario, I am assuming that the handling of file uploads operates in a buffering manner rather than streaming. It is interested how to achieve streaming.

Start by reviewing Spring Cloud Gateway's multipart request handling and the Reactor Netty and Netty concerns named in the report. Determine whether uploads are buffered or streamed when they exceed container RAM, then document the supported behavior and any established streaming approach.