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fix: limit number of CONTINUATION frames allowed
Calculate the amount of allowed CONTINUATION frames based on other settings. max_header_list_size / max_frame_size That is about how many CONTINUATION frames would be needed to send headers up to the max allowed size. We then multiply by that by a small amount, to allow for implementations that don't perfectly pack into the minimum frames *needed*. In practice, *much* more than that would be a very inefficient peer, or a peer trying to waste resources. See https://seanmonstar.com/blog/hyper-http2-continuation-flood/ for more info.
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