143 lines
5.2 KiB
Markdown
143 lines
5.2 KiB
Markdown
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**English** | [中文](https://github.com/nanmu42/gzip/blob/master/README.Chinese.md)
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# Gzip Middleware for Go
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[](https://godoc.org/github.com/nanmu42/gzip)
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[](https://github.com/nanmu42/gzip/actions)
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[](https://codecov.io/gh/nanmu42/gzip)
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[](https://github.com/nanmu42/gzip/actions)
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[](https://goreportcard.com/report/github.com/nanmu42/gzip)
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An out-of-the-box, also customizable gzip middleware for [Gin](https://github.com/gin-gonic/gin) and [net/http](https://golang.org/pkg/net/http/).
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# Examples
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Use `DefaultHandler()` to create a ready-to-go gzip middleware.
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## Gin
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```go
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import github.com/nanmu42/gzip
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func main() {
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g := gin.Default()
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// use default settings
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g.Use(gzip.DefaultHandler().Gin)
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g.GET("/", func(c *gin.Context) {
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c.JSON(http.StatusOK, map[string]interface{}{
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"code": 0,
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"msg": "hello",
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"data": fmt.Sprintf("l%sng!", strings.Repeat("o", 1000)),
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})
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})
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log.Println(g.Run(fmt.Sprintf(":%d", 3000)))
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}
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```
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## net/http
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```go
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import github.com/nanmu42/gzip
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func main() {
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mux := http.NewServeMux()
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mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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writeString(w, fmt.Sprintf("This content is compressed: l%sng!", strings.Repeat("o", 1000)))
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})
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// wrap http.Handler using default settings
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log.Println(http.ListenAndServe(fmt.Sprintf(":%d", 3001), gzip.DefaultHandler().WrapHandler(mux)))
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}
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func writeString(w http.ResponseWriter, payload string) {
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w.Header().Set("Content-Type", "text/plain; charset=utf8")
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_, _ = io.WriteString(w, payload+"\n")
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}
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```
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## Customize Handler
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Handler can be customized using `NewHandler` and `Config`:
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```go
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import github.com/nanmu42/gzip
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handler := gzip.NewHandler(gzip.Config{
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// gzip compression level to use
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CompressionLevel: 6,
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// minimum content length to trigger gzip, the unit is in byte.
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MinContentLength: 1024,
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// RequestFilter decide whether or not to compress response judging by request.
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// Filters are applied in the sequence here.
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RequestFilter: []RequestFilter{
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NewCommonRequestFilter(),
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DefaultExtensionFilter(),
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},
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// ResponseHeaderFilter decide whether or not to compress response
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// judging by response header
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ResponseHeaderFilter: []ResponseHeaderFilter{
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NewSkipCompressedFilter(),
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DefaultContentTypeFilter(),
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},
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})
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```
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`RequestFilter` and `ResponseHeaderFilter` are interfaces.
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You may define one that specially suits your need.
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# Performance
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* When response payload is small, the handler is smart enough to skip compression automatically, which takes neglectable overhead.
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* At the time when the payload is big enough, gzip kicks in and there is a reasonable price.
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```
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$ go test -benchmem -bench .
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goos: linux
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goarch: amd64
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pkg: github.com/nanmu42/gzip
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BenchmarkSoleGin_SmallPayload-4 4104684 276 ns/op 64 B/op 2 allocs/op
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BenchmarkGinWithDefaultHandler_SmallPayload-4 1683307 707 ns/op 96 B/op 3 allocs/op
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BenchmarkSoleGin_BigPayload-4 4198786 274 ns/op 64 B/op 2 allocs/op
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BenchmarkGinWithDefaultHandler_BigPayload-4 44780 27636 ns/op 190 B/op 5 allocs/op
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PASS
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ok github.com/nanmu42/gzip 6.373s
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```
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Note: due to [an awkward man-mistake](https://github.com/nanmu42/gzip/pull/3#issuecomment-735352715), benchmark of and before `v1.0.0` are not accurate.
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# Limitation
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* You should always provide a `Content-Type` in http response's header, though handler guesses by `http.DetectContentType()`as makeshift;
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* When `Content-Length` is not available, handler may buffer your writes to decide if its big enough to do a meaningful compression. A high `MinContentLength` may bring memory overhead, although the handler tries to be smart by reusing buffers and testing if `len(data)` of the first `http.ResponseWriter.Write(data []byte)` calling suffices or not.
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# Status: Stable
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All APIs are finalized, and no breaking changes will be made in the 1.x series of releases.
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# Acknowledgement
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During the development of this work, the author took following works/materials as reference:
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* https://github.com/caddyserver/caddy/tree/master/caddyhttp/gzip (Apache License 2.0)
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* https://github.com/gin-contrib/gzip (MIT License)
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* https://blog.cloudflare.com/results-experimenting-brotli/
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* https://support.cloudflare.com/hc/en-us/articles/200168396-What-will-Cloudflare-compress-
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This package uses [klauspost's compress package](https://github.com/klauspost/compress) to handle gzip compression.
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Logo generated at [Gopherize.me](https://gopherize.me/).
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# License
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```
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MIT License
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Copyright (c) 2019 LI Zhennan
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Caddy is licensed under the Apache License
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Copyright 2015 Light Code Labs, LLC
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```
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