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net/http: sniff less

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We were reading 1024 bytes but only using 512.

Fixes #6311

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13289047
This commit is contained in:
Brad Fitzpatrick 2013-09-03 09:11:25 -07:00
parent c576bcbad5
commit 8272c14f7e
1 changed files with 2 additions and 3 deletions
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5
src/pkg/net/http/fs.go
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@ -146,10 +146,9 @@ func serveContent(w ResponseWriter, r *Request, name string, modtime time.Time,
ctype = mime.TypeByExtension(filepath.Ext(name))
if ctype == "" {
// read a chunk to decide between utf-8 text and binary
var buf [1024]byte
var buf [sniffLen]byte
n, _ := io.ReadFull(content, buf[:])
b := buf[:n]
ctype = DetectContentType(b)
ctype = DetectContentType(buf[:n])
_, err := content.Seek(0, os.SEEK_SET) // rewind to output whole file
if err != nil {
Error(w, "seeker can't seek", StatusInternalServerError)