I am using http_transfer to communicate with a server running locally which does some work, then responds with some data. A typical round trip is < 0.1 seconds.
I find that when the data argument to http_transfer is larger than about 1000 bytes, every call blocks for 1-2 seconds before my http server receives the POST.
This issue also affects http_post.
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Degraded performance for http_transfer with data arg >1k