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net/http/httputil: preallocate trailerKeys slice

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To prevent slice growths with append operations.

Change-Id: Icdb745b23cc44dfaf3e16746b94c06997f814e15
Reviewed-on: https://go-review.googlesource.com/23784
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Gyu-Ho Lee 2016-06-04 23:26:12 -07:00 committed by Brad Fitzpatrick
parent 4383e4387b
commit 5bbb854cee
1 changed files with 1 additions and 1 deletions
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2
src/net/http/httputil/reverseproxy.go
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@ -221,7 +221,7 @@ func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
// The "Trailer" header isn't included in the Transport's response,
// at least for *http.Transport. Build it up from Trailer.
if len(res.Trailer) > 0 {
var trailerKeys []string
trailerKeys := make([]string, 0, len(res.Trailer))
for k := range res.Trailer {
trailerKeys = append(trailerKeys, k)
}