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encode: Tweak compression settings (#4215)

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* Tweak compression settings

zstd: Limit window sizes to 128K to keep memory in control both server and client size.
zstd: Write 0 length frames. This may be needed for compatibility.
zstd: Create fewer encoders. Small memory improvement.
gzip: Allow -2 (Huffman only) and -3 (stateless) compression modes.

* Update modules/caddyhttp/encode/zstd/zstd.go

Update docs.

Co-authored-by: Francis Lavoie <lavofr@gmail.com>

Co-authored-by: Francis Lavoie <lavofr@gmail.com>
This commit is contained in:
Klaus Post
2021-06-18 10:49:49 -07:00
committed by GitHub
parent 9d4ed3a323
commit 69c914483d
2 changed files with 8 additions and 6 deletions
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modules/caddyhttp/encode/zstd/zstd.go
+4 -1
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@@ -47,7 +47,10 @@ func (Zstd) AcceptEncoding() string { return "zstd" }
// NewEncoder returns a new gzip writer.
func (z Zstd) NewEncoder() encode.Encoder {
writer, _ := zstd.NewWriter(nil)
// The default of 8MB for the window is
// too large for many clients, so we limit
// it to 128K to lighten their load.
writer, _ := zstd.NewWriter(nil, zstd.WithWindowSize(128<<10), zstd.WithEncoderConcurrency(1), zstd.WithZeroFrames(true))
return writer
}