title: send data to firebase using REST API or HTTPS request
body: <p>after reading this answer <a href="https://stackoverflow.com/a/51614256/15486192">https://stackoverflow.com/a/51614256/15486192</a> from @Arsam, i am successfully sending data from nodeMcu esp8266 to firebase.
  but i am using Database secrets Although it is deprecated.</p>
  <p>and while searching for an alternative i came across firebase REST</p>
  <p><strong>Firebase Database REST API</strong></p>
  <p>API Usage</p>
  <blockquote>
  <p>You can use any Firebase Realtime Database URL as a REST
  endpoint. All you need to do is append .json to the end of the URL and
  send a request from your favorite HTTPS client.
  HTTPS is required. Firebase only responds to encrypted traffic so that your data remains safe.</p>
  </blockquote>
  <p>after reading that, <strong>anyone conclude that you can send data to firebase using HTTPS request</strong>.</p>
  <p>so my questions,</p>
  <p><strong>is REST API just an HTTP request?
  i am just confused if it is, then why just not naming it HTTP API?
  can i send my data to firebase Realtime-database using only https request from my client?if yes then how</strong></p>