Move Request Params to Body from URL

Question

I want to use Imagga API to recognise what is shown in the photo.

I read the documentation and learned that I can use POST or GET request with endpoint like https://api.imagga.com/v2/tags?image_url=<imageUrl>.

In this example I set the image url directly in my URL.

This API also allow to use base64 images (with image_base64 param) to do the search, but base64 format is too long to use it directly in query.

I tried to move my params to the request body, so I used endpoint https://api.imagga.com/v2/tags and request body in format: { "image_url": "<imageUrl>" } but whet I tried this way I received status Bad Request and JSON result like {"status":{"text":"Please provide content for processing.","type":"error"}.

So, can I move my request params from URL to request body, and if not, is there another way I can use URL with base64 format?