From: Gyu-Ho Lee <gyuhox@gmail.com>
Date: Sun, 5 Jun 2016 06:26:12 +0000 (-0700)
Subject: net/http/httputil: preallocate trailerKeys slice
X-Git-Tag: go1.8beta1~1168
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=5bbb854cee2df329e031e50181ccc022c9d93a85;p=gostls13.git

net/http/httputil: preallocate trailerKeys slice

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>
---

diff --git a/src/net/http/httputil/reverseproxy.go b/src/net/http/httputil/reverseproxy.go
index f8b60b6d33..76f23bcf9a 100644
--- a/src/net/http/httputil/reverseproxy.go
+++ b/src/net/http/httputil/reverseproxy.go
@@ -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)
 		}