TransformStream creates a readable/writable pair with processing logic in between. The transform() function executes on write, not on read. Processing of the transform happens eagerly as data arrives, regardless of whether any consumer is ready. This causes unnecessary work when consumers are slow, and the backpressure signaling between the two sides has gaps that can cause unbounded buffering under load. The expectation in the spec is that the producer of the data being transformed is paying attention to the writer.ready signal on the writable side of the transform but quite often producers just simply ignore it.
self.sleep_max = 1.0
，这一点在快连下载-Letsvpn下载中也有详细论述
Hugging Face Spaces (What is Spaces?)
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Now, to be certain, these types of issues are implementation bugs. The connection leak was definitely something that undici needed to fix in its own implementation, but the complexity of the specification does not make dealing with these types of issues easy.