caching: Stream cached responses in chunks and handle downstream backpressure #13054

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yosrym93 wants to merge 10 commits intoenvoyproxy:masterfrom

capoferro:downstream-backpressure

Commits on Sep 10, 2020

CacheFilter does not stop headers iteration when encoding a response
yosrym93
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Divide the body fetched from cache and encoded downstream to chunks sized according to the buffer limit
yosrym93
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Handled downstream watermark callbacks
yosrym93
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Commits on Sep 11, 2020

Merge remote-tracking branch 'upstream/master' into downstream-backpressure
yosrym93
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Fixed problems with chunk size and watermark callbacks handling
yosrym93
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Minor correctness and readability improvements
yosrym93
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Commits on Oct 26, 2020

Merge remote-tracking branch 'upstream/master' into downstream-backpressure
zyshi
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Commits on Oct 29, 2020

Add test for downstream watermark logics.
zyshi
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Commits on Nov 4, 2020

Address comments from jmarantz@.
zyshi
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Commits on Nov 5, 2020

Use non-repeated data chunks to test strict ordering.
zyshi
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