diff --git a/pygeoapi/api/__init__.py b/pygeoapi/api/__init__.py
index e54b90e6a..78740ef48 100644
--- a/pygeoapi/api/__init__.py
+++ b/pygeoapi/api/__init__.py
@@ -662,17 +662,17 @@ def landing_page(api: API,
         'rel': request.get_linkrel(F_JSON),
         'type': FORMAT_TYPES[F_JSON],
         'title': l10n.translate('This document as JSON', request.locale),
-        'href': f"{api.base_url}?f={F_JSON}"
+        'href': f"{api.base_url}/?f={F_JSON}"
     }, {
         'rel': request.get_linkrel(F_JSONLD),
         'type': FORMAT_TYPES[F_JSONLD],
         'title': l10n.translate('This document as RDF (JSON-LD)', request.locale),  # noqa
-        'href': f"{api.base_url}?f={F_JSONLD}"
+        'href': f"{api.base_url}/?f={F_JSONLD}"
     }, {
         'rel': request.get_linkrel(F_HTML),
         'type': FORMAT_TYPES[F_HTML],
         'title': l10n.translate('This document as HTML', request.locale),
-        'href': f"{api.base_url}?f={F_HTML}",
+        'href': f"{api.base_url}/?f={F_HTML}",
         'hreflang': api.default_locale
     }, {
         'rel': 'service-desc',
diff --git a/pygeoapi/api/collection.py b/pygeoapi/api/collection.py
index 3b1f24922..7b3310074 100644
--- a/pygeoapi/api/collection.py
+++ b/pygeoapi/api/collection.py
@@ -181,12 +181,12 @@ def gen_collection(api, request, dataset: str,
         'type': FORMAT_TYPES[F_JSON],
         'rel': 'root',
         'title': l10n.translate('The landing page of this server as JSON', locale_),  # noqa
-        'href': f"{api.base_url}?f={F_JSON}"
+        'href': f"{api.base_url}/?f={F_JSON}"
     }, {
         'type': FORMAT_TYPES[F_HTML],
         'rel': 'root',
         'title': l10n.translate('The landing page of this server as HTML', locale_),  # noqa
-        'href': f"{api.base_url}?f={F_HTML}"
+        'href': f"{api.base_url}/?f={F_HTML}"
     }, {
         'type': FORMAT_TYPES[F_JSON],
         'rel': request.get_linkrel(F_JSON),
diff --git a/pygeoapi/api/itemtypes.py b/pygeoapi/api/itemtypes.py
index 65c93aa0a..2a2a8da4c 100644
--- a/pygeoapi/api/itemtypes.py
+++ b/pygeoapi/api/itemtypes.py
@@ -956,12 +956,12 @@ def get_collection_item(api: API, request: APIRequest,
         'type': FORMAT_TYPES[F_JSON],
         'rel': 'root',
         'title': l10n.translate('The landing page of this server as JSON', request.locale),  # noqa
-        'href': f"{api.base_url}?f={F_JSON}"
+        'href': f"{api.base_url}/?f={F_JSON}"
         }, {
         'type': FORMAT_TYPES[F_HTML],
         'rel': 'root',
         'title': l10n.translate('The landing page of this server as HTML', request.locale),  # noqa
-        'href': f"{api.base_url}?f={F_HTML}"
+        'href': f"{api.base_url}/?f={F_HTML}"
         }, {
         'rel': request.get_linkrel(F_JSON),
         'type': 'application/geo+json',
diff --git a/pygeoapi/api/processes.py b/pygeoapi/api/processes.py
index f2a4eb588..d699755ec 100644
--- a/pygeoapi/api/processes.py
+++ b/pygeoapi/api/processes.py
@@ -324,13 +324,13 @@ def get_jobs(api: API, request: APIRequest,
         if JobStatus[job_['status']] in (
            JobStatus.successful, JobStatus.running, JobStatus.accepted):
 
-            job_result_url = f"{api.base_url}/jobs/{job_['identifier']}/results"  # noqa
+            job_result_url = f"{api.base_url}/jobs/{job_['identifier']}/results?f={F_JSON}"  # noqa
 
             job2['links'] = [{
                 'href': job_result_url,
                 'rel': 'http://www.opengis.net/def/rel/ogc/1.0/results',
                 'type': job_['mimetype'],
-                'title': f"Results of job {job_id} as {job_['mimetype']}"
+                'title': f"Results of job {job_['identifier']} as {job_['mimetype']}"  # noqa
             }]
 
         serialized_jobs['jobs'].append(job2)
@@ -592,20 +592,18 @@ def get_job_result(api: API, request: APIRequest,
     if mimetype not in (None, FORMAT_TYPES[F_JSON]):
         headers['Content-Type'] = mimetype
         content = job_output
+    elif request.format == F_HTML:
+        headers['Content-Type'] = "text/html"
+        data = {
+            'job': {'id': job_id},
+            'result': job_output
+        }
+        content = render_j2_template(
+            api.config, api.config['server']['templates'],
+            'jobs/results/index.html', data, request.locale)
     else:
-        if request.format == F_JSON:
-            content = json.dumps(job_output, sort_keys=True, indent=4,
-                                 default=json_serial)
-        else:
-            # HTML
-            headers['Content-Type'] = "text/html"
-            data = {
-                'job': {'id': job_id},
-                'result': job_output
-            }
-            content = render_j2_template(
-                api.config, api.config['server']['templates'],
-                'jobs/results/index.html', data, request.locale)
+        content = json.dumps(job_output, sort_keys=True, indent=4,
+                             default=json_serial)
 
     return headers, HTTPStatus.OK, content
 
diff --git a/pygeoapi/provider/xarray_.py b/pygeoapi/provider/xarray_.py
index 619e07127..b00c2385e 100644
--- a/pygeoapi/provider/xarray_.py
+++ b/pygeoapi/provider/xarray_.py
@@ -383,8 +383,6 @@ def gen_covjson(self, metadata, data, fields):
             self, selected_fields
         )
 
-        data = data.fillna(None)
-
         try:
             for key, value in selected_fields.items():
                 LOGGER.debug(f'Adding range {key}')
diff --git a/tests/api/test_api.py b/tests/api/test_api.py
index e0dc1e547..cbd95bdef 100644
--- a/tests/api/test_api.py
+++ b/tests/api/test_api.py
@@ -534,10 +534,10 @@ def test_root(config, api_):
     assert root['links'][0]['href'] == 'http://example.org'
     assert root['links'][1]['rel'] == 'self'
     assert root['links'][1]['type'] == FORMAT_TYPES[F_JSON]
-    assert root['links'][1]['href'].endswith('?f=json')
-    assert any(link['href'].endswith('f=jsonld') and link['rel'] == 'alternate'
+    assert root['links'][1]['href'].endswith('/?f=json')
+    assert any(link['href'].endswith('/?f=jsonld') and link['rel'] == 'alternate'  # noqa
                for link in root['links'])
-    assert any(link['href'].endswith('f=html') and link['rel'] == 'alternate'
+    assert any(link['href'].endswith('/?f=html') and link['rel'] == 'alternate'  # noqa
                for link in root['links'])
     assert len(root['links']) == 13
     assert 'title' in root