From 368f50fcb4c7537b90249c3c497e61dc81038f6e Mon Sep 17 00:00:00 2001
From: darmiel <71837281+darmiel@users.noreply.github.com>
Date: Wed, 4 May 2022 14:38:10 +0200
Subject: [PATCH] net/http: check if strings.Cut was successful before trimming
 the cookie name

---
 src/net/http/cookie.go      | 2 +-
 src/net/http/cookie_test.go | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/net/http/cookie.go b/src/net/http/cookie.go
index 1810790ac3..8add1ffdc7 100644
--- a/src/net/http/cookie.go
+++ b/src/net/http/cookie.go
@@ -70,10 +70,10 @@ func readSetCookies(h Header) []*Cookie {
 		}
 		parts[0] = textproto.TrimString(parts[0])
 		name, value, ok := strings.Cut(parts[0], "=")
-		name = textproto.TrimString(name)
 		if !ok {
 			continue
 		}
+		name = textproto.TrimString(name)
 		if !isCookieNameValid(name) {
 			continue
 		}
diff --git a/src/net/http/cookie_test.go b/src/net/http/cookie_test.go
index 3c5c50b632..0db138e4f1 100644
--- a/src/net/http/cookie_test.go
+++ b/src/net/http/cookie_test.go
@@ -352,6 +352,8 @@ var readSetCookiesTests = []struct {
 		Header{"Set-Cookie": {`special-8=","`}},
 		[]*Cookie{{Name: "special-8", Value: ",", Raw: `special-8=","`}},
 	},
+	// Make sure we can properly read back the Set-Cookie headers
+	// for names containing spaces:
 	{
 		Header{"Set-Cookie": {`special-9 =","`}},
 		[]*Cookie{{Name: "special-9", Value: ",", Raw: `special-9 =","`}},