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CJEnright/gzip.go

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Revisions

  1. CJEnright revised this gist Oct 10, 2018. No changes.
  2. CJEnright revised this gist Oct 10, 2018. No changes.
  3. CJEnright renamed this gist Oct 10, 2018. 1 changed file with 0 additions and 0 deletions.
    0 gistfile1.txt → gzip.go
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    File renamed without changes.
  4. CJEnright created this gist Oct 10, 2018.
    50 changes: 50 additions & 0 deletions gistfile1.txt
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,50 @@
    package main

    import (
    "net/http"
    "compress/gzip"
    "io/ioutil"
    "strings"
    "sync"
    "io"
    )

    var gzPool = sync.Pool {
    New: func() interface{} {
    w := gzip.NewWriter(ioutil.Discard)
    return w
    },
    }

    type gzipResponseWriter struct {
    io.Writer
    http.ResponseWriter
    }

    func (w *gzipResponseWriter) WriteHeader(status int) {
    w.Header().Del("Content-Length")
    w.ResponseWriter.WriteHeader(status)
    }

    func (w *gzipResponseWriter) Write(b []byte) (int, error) {
    return w.Writer.Write(b)
    }

    func Gzip(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
    next.ServeHTTP(w, r)
    return
    }

    w.Header().Set("Content-Encoding", "gzip")

    gz := gzPool.Get().(*gzip.Writer)
    defer gzPool.Put(gz)

    gz.Reset(w)
    defer gz.Close()

    next.ServeHTTP(&gzipResponseWriter{ResponseWriter: w, Writer: gz}, r)
    })
    }