fetchExample.js

fetch("http://127.0.0.1:5000/getSummary", {
        "body": JSON.stringify({"url":"https://owasp.org/www-community/attacks/csrf"}),
        "method": "POST",
        "headers":{
                "Content-Type": "application/json"
        }
    }).then(response=> response.body). then(rb => {
        const reader = rb.getReader();
        return new ReadableStream({
        start(controller) {
            // The following function handles each data chunk
            function push() {
            // "done" is a Boolean and value a "Uint8Array"
            reader.read().then( ({done, value}) => {
                // If there is no more data to read
                if (done) {
                controller.close();
                return;
                }
                // Get the data and send it to the browser via the controller
                controller.enqueue(value);
                push();
            })
            }
            push();
        }
        });
    })
    .then(stream => {
        // Respond with our stream
        return new Response(stream, { headers: { "Content-Type": "text/html" } }).text();
    })
    .then(result => {
        // Do things with result
        console.log('Response : ',result);
  })
  .catch(e=>console.log('Error : ',e));