Send HTTP protocol information to SpeedCurve

Author: csswizardry

js/obs.speedcurve.js

@@ -34,4 +34,19 @@
       window.LUX.addData(key, obs[key]);
     }
   }
+
+  // Send HTTP Protocol if available via Server-Timing header.
+  const navEntry = performance.getEntriesByType('navigation')[0];
+  if (!navEntry || !Array.isArray(navEntry.serverTiming)) {
+    return;
+  }
+
+  const protocol = navEntry.serverTiming.find(t => t.name === 'protocol');
+
+  if (!protocol || !protocol.description) {
+    return;
+  }
+
+  LUX.addData('Protocol', protocol.description);
+
 })();