AMP: Building Accelerated Mobile Pages

Variables

We can add arbitrary variables in the vars object, and we can then reference them in the request URLs. In the preceding example, we specified a property account as "account": "UA-XXXXX-Y", and in the URL, we can reference this property as ${account}.

We can also use the extraUrlParams object to add arbitrary parameters to the URL automatically. We can add the following to the configuration:

"extraUrlParams": {  "a": "1",  "b": "2"}

This would add a=1&b=2 to the end of the analytics request URL without having to add a=${a}&b=${b} to the URL manually.