fix(#4550): setCookie should append cookies (#4558)

2 files changed, 9 insertions, 1 deletions

diff --git a/std/http/cookie.ts b/std/http/cookie.ts
index 062019f14..41d417518 100644
--- a/std/http/cookie.ts
+++ b/std/http/cookie.ts
@@ -115,7 +115,7 @@ export function setCookie(res: Response, cookie: Cookie): void {
   // TODO (zekth) : Add proper parsing of Set-Cookie headers
   // Parsing cookie headers to make consistent set-cookie header
   // ref: https://tools.ietf.org/html/rfc6265#section-4.1.1
-  res.headers.set("Set-Cookie", toString(cookie));
+  res.headers.append("Set-Cookie", toString(cookie));
 }
 
 /**
diff --git a/std/http/cookie_test.ts b/std/http/cookie_test.ts
index 1b78b2bff..52bd8c375 100644
--- a/std/http/cookie_test.ts
+++ b/std/http/cookie_test.ts
@@ -206,5 +206,13 @@ test({
       res.headers.get("Set-Cookie"),
       "__Host-Kitty=Meow; Secure; Path=/"
     );
+
+    res.headers = new Headers();
+    setCookie(res, { name: "cookie-1", value: "value-1", secure: true });
+    setCookie(res, { name: "cookie-2", value: "value-2", maxAge: 3600 });
+    assertEquals(
+      res.headers.get("Set-Cookie"),
+      "cookie-1=value-1; Secure, cookie-2=value-2; Max-Age=3600"
+    );
   },
 });