fix: Prevent HttpRequest from being closed

In case a stream the request is being piped into closes,
we don't want to close the request since it shares a socket
with the response.

test/unit/server/HttpRequest.test.ts

@@ -0,0 +1,10 @@
+import { isHttpRequest } from '../../../src/server/HttpRequest';
+
+describe('HttpRequest', (): void => {
+  describe('#isHttpRequest', (): void => {
+    it('can identify HttpRequests.', async(): Promise<void> => {
+      expect(isHttpRequest({})).toBe(false);
+      expect(isHttpRequest({ socket: {}, method: 'GET', url: '/url' })).toBe(true);
+    });
+  });
+});