在Go中读取gzip压缩的HTTP响应

Question

I am trying to read a gzipped HTTP response with Go! but I always get the following error message :

panic: gzip: invalid header
[...] stack trace [...]

If I run "curl -H "Accept-Encoding: gzip" http://foo.com/ | gunzip -" I get the response correctly gunzipped. I also double checked with ngrep and the pair Accept-Encoding/Content-Encoding is correctly sent/returned.

If I create a file with some dummy content and gzip it, I can read it from my Go! program.

The program I used for testing:

package main

import (
    "io"
    //"os"
    "fmt"
    "compress/gzip"
    "net/http"
)

func main() {
    /* This works fine
    f, _ := os.Open("/tmp/test.gz")
    defer f.Close()
    reader, err := gzip.NewReader(f)
    */

    // This does not :/
    resp, _ := http.Get("http://foo.com/")
    defer resp.Body.Close()
    reader, err := gzip.NewReader(resp.Body)

    if err != nil { panic(err) }

    buff := make([]byte, 1024)
    for {
        n, err := reader.Read(buff)

        if err != nil && err != io.EOF {
            panic(err)
        }

        if n == 0 {
            break
        }
    }

    s := fmt.Sprintf("%s", buff)
    fmt.Println(s)
}

Have I overlooked something ?

Answer 1

net/http#Transport handles gzip compressed responses. You don't have to do anything special.