net/http: remove unnecessary string replace operation in Cookie.String

Fixes #29135

Change-Id: I4c10b0395047775e8488b8b0f00f74a7fa01b86c
GitHub-Last-Rev: 120977040506794f00c74383289f913b1e0edd4a
GitHub-Pull-Request: golang/go#29728
Reviewed-on: https://go-review.googlesource.com/c/go/+/157777Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/net/http/cookie.go

@@ -173,7 +173,7 @@ func (c *Cookie) String() string {
 	const extraCookieLength = 110
 	var b strings.Builder
 	b.Grow(len(c.Name) + len(c.Value) + len(c.Domain) + len(c.Path) + extraCookieLength)
-	b.WriteString(sanitizeCookieName(c.Name))
+	b.WriteString(c.Name)
 	b.WriteRune('=')
 	b.WriteString(sanitizeCookieValue(c.Value))
 

src/net/http/cookie_test.go

@@ -127,6 +127,22 @@ var writeSetCookiesTests = []struct {
 		&Cookie{Name: "\t"},
 		``,
 	},
+	{
+		&Cookie{Name: "\r"},
+		``,
+	},
+	{
+		&Cookie{Name: "a\nb", Value: "v"},
+		``,
+	},
+	{
+		&Cookie{Name: "a\nb", Value: "v"},
+		``,
+	},
+	{
+		&Cookie{Name: "a\rb", Value: "v"},
+		``,
+	},
 }
 
 func TestWriteSetCookies(t *testing.T) {