allianceauth/allianceauth/admin_status/templates/admin-status/esi_check.html

{% load i18n %}
<div id="esi-alert" class="col-12 collapse">
    <div class="alert alert-warning">
        <p class="text-center ">{% translate 'Your Server received an ESI error response code of ' %}<b id="esi-code">?</b></p>
        <hr>
        <pre id="esi-data" class="text-center text-wrap"></pre>
    </div>
</div>

<script>
    const elemCard = document.getElementById("esi-alert");
    const elemMessage = document.getElementById("esi-data");
    const elemCode = document.getElementById("esi-code");

    fetch('{% url "authentication:esi_check" %}')
        .then((response) => {
            if (response.ok) {
                return response.json();
            }
            throw new Error("Something went wrong");
        })
        .then((responseJson) => {
            console.log("ESI Check: ", JSON.stringify(responseJson, null, 2));

            const status = responseJson.status;
            if (status !== 200) {
                elemCode.textContent = status
                elemMessage.textContent = responseJson.data.error;
                new bootstrap.Collapse(elemCard, {
                    toggle: true
                })
            }
        })
        .catch((error) => {
            console.log(error);
        });
</script>