django – How can I consume and HTTP API in my HTTPS website – Stack Overflow

I built the frontend of my website using React, and it is hosted on netlify. Here is an example of a call I make to my API.

fetch(`http://blabla.com/all/`, {
            method: "GET",
            headers: {
                'Content-Type': 'application/json',
            }
        }).then((res) => {
            return res.json();
        }
        ).then((data) => {
            let informations = data.restaurant;
            // do stuff with data
        }).catch((err) => {
            console.log(err);
        })

This site is hosted on an https domain, provided by netfily. Then, my backend is a Django app, built with Docker compose and hosted on digital ocean droplets, that serves via HTTP. But each time I can the API with the site, it returns that

 Mixed Content: The page at 'https://...' was loaded over HTTPS, but requested an insecure
 resource 'http:...'. This request has been blocked; the content must be served
 over HTTPS.

How can I fix this? Is there anything that can be done on the frontend to allow it?

Otherwise, how do I put the HTTPS stuff on digital ocean droplets and django? Because I spent almost three hours trying to figure it out, without being able to do so.

Please help me