Use JSON-LD link if found in HTML template

Author: webb-ben

pygeoapi/templates/_base.html

@@ -75,6 +75,7 @@
           <a href="{{ link['href'] }}">{% trans %}json{% endtrans %}</a>
           {% elif link['rel'] == 'alternate' and link['type'] and link['type'] == 'application/ld+json' %}
           {% set links_found.jsonld = 1 %}
+          {% set jsonld_href = link['href'] %}
           <a href="{{ link['href'] }}">{% trans %}jsonld{% endtrans %}</a>
           {% endif %}
           {% endfor %}
@@ -114,7 +115,11 @@
     <script>
       // Requests and embeds JSON-LD representation of current page
       var xhr = new XMLHttpRequest();
+      {% if links_found.jsonld == 0 -%}
+      var path = {{ jsonld_href }};
+      {%- else -%}
       var path = window.location.protocol + "//" + window.location.host + window.location.pathname + "?f=jsonld";
+      {%- endif %}
       xhr.open('GET', path);
       xhr.onload = function() {
         if (xhr.status === 200) {