title: Pass parameters to Airflow Experimental REST api when creating dag run
body: <p>Looks like Airflow has an experimental REST api that allow users to create dag runs with https POST request. This is awesome. </p>
  
  <p>Is there a way to pass parameters via HTTP to the create dag run? Judging from the official docs, found <a href="https://airflow.apache.org/api.html" rel="noreferrer">here</a>, it would seem the answer is "no" but I'm hoping I'm wrong. </p>