Part-DB-server/templates/bundles/TwigBundle/Exception/error400.html.twig

{% extends "bundles/TwigBundle/Exception/error.html.twig" %}

{% set untrusted_host = exception.message starts with 'Untrusted Host' or exception.message starts with 'Invalid Host' %}
{% set seen_host = untrusted_host ? (exception.message|split('"'))[1]|default(null) : null %}

{% block status_comment %}
    {% if untrusted_host %}
        Part-DB was accessed using a host name that is not marked as trusted.<br>
        {% if seen_host %}
            The host name Part-DB saw was: <code>{{ seen_host }}</code>
        {% else %}
            <code>{{ exception.message }}</code>
        {% endif %}
    {% else %}
        Your browser sent a request that the server could not understand.
    {% endif %}
{% endblock %}

{% block admin_info %}
    {% if untrusted_host %}
        <b><i>Untrusted host name.</i></b><br>
        <p>For security reasons (to prevent HTTP Host header attacks), Part-DB only responds to requests using host names that were explicitly marked as trusted, once more than one host name is used to access it (e.g. behind a reverse proxy).</p>
        <p>Try following things:</p>
        <ul>
            <li>Ensure that you are using the correct URL to access Part-DB.</li>
            <li>Set the <code>TRUSTED_HOSTS</code> environment variable in your <code>.env.local</code> file (or your docker-compose environment) to a regular expression matching all host names Part-DB should be reachable under, e.g.
                {% if seen_host %}
                    <code>TRUSTED_HOSTS='^({{ seen_host|replace({'.': '\\.'}) }})$'</code> (if <code>{{ seen_host }}</code> is a host name you trust)
                {% else %}
                    <code>TRUSTED_HOSTS='^(localhost|example\.com)$'</code>
                {% endif %}
            </li>
            <li>If Part-DB is running behind a reverse proxy, also make sure that <code>TRUSTED_PROXIES</code> is configured correctly, so the original host name is forwarded properly.</li>
            <li>Run <kbd>php bin/console cache:clear</kbd> after changing the configuration.</li>
        </ul>
    {% else %}
        {{ parent() }}
    {% endif %}
{% endblock %}