fix: keep cookie-domain in set-cookie header after proxy

src/handlers/response-interceptor.ts

@@ -95,15 +95,7 @@ function copyHeaders(originalResponse, response) {
     keys = keys.filter((key) => !['content-encoding', 'transfer-encoding'].includes(key));
 
     keys.forEach((key) => {
-      let value = originalResponse.headers[key];
-
-      if (key === 'set-cookie') {
-        // remove cookie domain
-        value = Array.isArray(value) ? value : [value];
-        value = value.map((x) => x.replace(/Domain=[^;]+?/i, ''));
-      }
-
-      response.setHeader(key, value);
+      response.setHeader(key, originalResponse.headers[key]);
     });
   } else {
     response.headers = originalResponse.headers;

test/e2e/response-interceptor.spec.ts

@@ -65,6 +65,16 @@ describe('responseInterceptor()', () => {
         .expect('set-cookie', /.*cookie=monster.*/)
         .expect(302);
     });
+
+    it('should proxy and return original domain of set-cookie headers', async () => {
+      return agent
+        .get(
+          `/response-headers?set-cookie=${encodeURIComponent(
+            'JSESSIONID=monster;Domain=httpbin.com;Path=/;SameSite=Lax'
+          )}`
+        )
+        .expect('set-cookie', /.*Domain=httpbin.com.*/);
+    });
   });
 
   describe('intercept compressed responses', () => {