My server keeps responded with error 404 forbidden. Can anyone see what I am doing wrong here?

Question

My server was working earlier, but now it continuously responds as error 404 and I cannot figure out why. Apparently there is a mistake on my side but I cannot work out what it is.

`var locationLat = ''; var locationLng = '';

var destinationLat = ''; var destinationLng = '';

var quote = 0;

function getQuotes() {

var location = document.getElementById('location').value;
var destination = document.getElementById('destination').value;

fetch(`https://maps.googleapis.com/maps/api/geocode/json?address=${location}&key=AIzaSyDpZkgmNpUUE_AfU7-3WM-ExBSH7yb39AI`)
    .then(response => response.json())
    .then(response => {
        locationLat = response.results[0].geometry.location.lat;
        locationLng = response.results[0].geometry.location.lng;

    }).catch(error => {document.getElementById('quote').innerHTML = "An error has occured" ,console.log(error)})

fetch(`https://ampthilcabs.herokuapp.com/https://maps.googleapis.com/maps/api/geocode/json?address=${destination}&key=AIzaSyDpZkgmNpUUE_AfU7-3WM-ExBSH7yb39AI`, {
    headers: {
        "Content-Type": "application/json",
        "Accept": "application/json"
    }
})
    .then(response => response.json())
    .then(response => {
        destinationLat = response.results[0].geometry.location.lat;
        destinationLng = response.results[0].geometry.location.lng;
    }).catch(error => {document.getElementById('quote').innerHTML = "An error has occured" ,console.log(error)})

fetch(`https://ampthilcabs.herokuapp.com/https://maps.googleapis.com/maps/api/distancematrix/json?units=imperial&origins=${locationLat},${locationLng}&destinations=${destinationLat},${destinationLng}&key=AIzaSyDpZkgmNpUUE_AfU7-3WM-ExBSH7yb39AI`,
    {
        headers: {
            'Content-Type': 'application/json',
            'Accept': 'application/json'
        }
    })
    .then(response => response.json())
    .then(response => {

        const miles = parseInt(response.rows[0].elements[0].distance.text);
        const price = miles * 2;
        document.getElementById('miles').innerHTML = miles
        document.getElementById('quote').innerHTML = price;
        var value = document.querySelector('#timings').value;

        document.getElementById('quoteContainer').style.display = 'flex';

        if (document.getElementById('numberOfPeople').value == 5) {
            var percentage = price * 0.25;
            price = price + percentage;

            console.log("Number of people is 5");
            document.getElementById('quote').innerHTML = price;
            document.getElementById('miles').innerHTML = miles;

        }

        if (value == 'premium') {
            var percentage = price * 0.25;
            price = price + percentage;
            console.log('Value is premium');
            document.getElementById('quote').innerHTML = price;
            document.getElementById('miles').innerHTML = miles;

        }
        var date = new Date(document.getElementById('date').value);

        if (date.getDay() == 0) {
            var percentage = price * 0.5;
            price = price + percentage;
            console.log(date.getDay());
            document.getElementById('quote').innerHTML = price;
            document.getElementById('miles').innerHTML = miles;
        }
        console.log(date.getDay());

    }).catch(error => {document.getElementById('quote').innerHTML = "An error has occured" ,console.log(error)})

}`

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