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mirrors/synapse

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Handle remote download responses with `UNKNOWN_LENGTH` more gracefully (#17439) Prior to this PR, remote downloads which did not provide a `content-length` were decremented from the remote download ratelimiter at the max allowable size, leading to excessive ratelimiting - see https://github.com/element-hq/synapse/issues/17394. This PR adds a linearizer to limit concurrent remote downloads to 6 per IP address, and decrements remote downloads without a `content-length` from the ratelimiter *after* the download is complete and the response length is known. Also adds logic to ensure that responses with a known length respect the `max_download_size`.

2024-07-16 13:13:55 +03:00

Limit concurrent remote downloads to 6 per IP address, and decrement remote downloads without a content-length from the ratelimiter after the download is complete.