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By having the stream interface pass the CF_STREAMER flag to the snd_buf() primitive, we're able to tell the send layer whether we're sending large chunks or small ones. We use this information in SSL to adjust the max record dynamically. This results in small chunks respecting tune.ssl.maxrecord at the beginning of a transfer or for small transfers, with an automatic switch to full records if the exchanges last long. This allows the receiver to parse HTML contents on the fly without having to retrieve 16kB of data, which is even more important with small initcwnd since the receiver does not need to wait for round trips to start fetching new objects. However, sending large files still produces large chunks. For example, with tune.ssl.maxrecord = 2859, we see 5 write(2885) sent in two segments each and 6 write(16421). This idea was first proposed on the haproxy mailing list by Ilya Grigorik.