diff --git a/openatlas/api/resources/resolve_endpoints.py b/openatlas/api/resources/resolve_endpoints.py
index 2102e88fa..a853cc2c6 100644
--- a/openatlas/api/resources/resolve_endpoints.py
+++ b/openatlas/api/resources/resolve_endpoints.py
@@ -104,9 +104,9 @@ def resolve_entity(
         parser: dict[str, Any]) \
         -> Union[Response, dict[str, Any], tuple[Any, int]]:
     if parser['export'] == 'csv':
-        export_entities_csv(entity, entity.name)
+        return export_entities_csv(entity, entity.name)
     if parser['export'] == 'csvNetwork':
-        export_csv_for_network_analysis([entity], parser)
+        return export_csv_for_network_analysis([entity], parser)
     result = get_entity_formatted(entity, parser)
     if parser['format'] in app.config['RDF_FORMATS']:  # pragma: nocover
         return Response(
diff --git a/tests/test_api.py b/tests/test_api.py
index d97f3b0be..8fded4bd4 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -99,19 +99,25 @@ def test_api(self) -> None:
                 assert self.get_geom_properties(rv, 'objectName')
                 assert self.get_geom_properties(rv, 'shapeType')
 
-            for rv in [
-                self.app.get(
-                    url_for('api_03.export_database', format_='xml')),
-                self.app.get(
-                    url_for('api_03.export_database', format_='json')),
-                self.app.get(
-                    url_for('api_03.export_database', format_='csv'))]:
-                assert b'Shire' in rv.data
+            rv = self.app.get(
+                url_for('api_03.export_database', format_='xml'))
+            assert b'Shire' in rv.data
+            assert 'application/xml' in rv.headers.get('Content-Type')
+
+            rv = self.app.get(
+                url_for('api_03.export_database', format_='json'))
+            assert b'Shire' in rv.data
+            assert 'application/json' in rv.headers.get('Content-Type')
+
+            rv = self.app.get(url_for('api_03.export_database', format_='csv'))
+            assert b'Shire' in rv.data
+            assert 'application/zip' in rv.headers.get('Content-Type')
 
             # ---Entity Endpoints---
             # Test Entity
             rv = self.app.get(
                 url_for('api_03.entity', id_=place.id, download=True))
+            assert 'application/json' in rv.headers.get('Content-Type')
             rv = rv.get_json()['features'][0]
             assert self.get_bool(rv, '@id')
             assert self.get_bool(rv, 'type', 'Feature')
@@ -159,6 +165,7 @@ def test_api(self) -> None:
             # Test entity in GeoJSON format
             rv = self.app.get(url_for(
                 'api_03.entity', id_=place.id, format='geojson'))
+            assert 'application/json' in rv.headers.get('Content-Type')
             rv = rv.get_json()['features'][0]
             assert self.get_bool(rv['geometry'], 'type')
             assert self.get_bool(rv['geometry'], 'coordinates')
@@ -176,6 +183,7 @@ def test_api(self) -> None:
 
             rv = self.app.get(url_for(
                 'api_03.entity', id_=place.id, format='geojson-v2'))
+            assert 'application/json' in rv.headers.get('Content-Type')
             rv = rv.get_json()['features'][0]
             assert self.get_bool(rv['geometry'], 'type')
             assert self.get_bool(
@@ -195,6 +203,7 @@ def test_api(self) -> None:
             # Test entity in Linked Open Usable Data
             rv = self.app.get(
                 url_for('api_03.entity', id_=place.id, format='loud'))
+            assert 'application/json' in rv.headers.get('Content-Type')
             rv = rv.get_json()
             assert bool(rv['type'] == 'PhysicalThing')
             assert bool(rv['_label'] == 'Shire')
@@ -228,15 +237,19 @@ def test_api(self) -> None:
             for rv in [
                 self.app.get(
                     url_for('api_03.entity', id_=place.id, export='csv')),
-                self.app.get(url_for(
-                    'api_03.entity', id_=place.id, export='csvNetwork')),
                 self.app.get(url_for(
                     'api_03.query',
                     entities=location.id,
                     cidoc_classes='E18',
                     view_classes='artifact',
                     system_classes='person',
-                    export='csv')),
+                    export='csv'))]:
+                assert b'Shire' in rv.data
+                assert 'text/csv' in rv.headers.get('Content-Type')
+
+            for rv in [
+                self.app.get(url_for(
+                    'api_03.entity', id_=place.id, export='csvNetwork')),
                 self.app.get(url_for(
                     'api_03.query',
                     entities=location.id,
@@ -245,6 +258,7 @@ def test_api(self) -> None:
                     system_classes='person',
                     export='csvNetwork'))]:
                 assert b'Shire' in rv.data
+                assert 'application/zip' in rv.headers.get('Content-Type')
 
             # Test Entities endpoints
             for rv in [
@@ -296,6 +310,7 @@ def test_api(self) -> None:
                     column='system_class',
                     download=True,
                     actor=place.id))]:
+                assert 'application/json' in rv.headers.get('Content-Type')
                 rv = rv.get_json()
                 rv_results = rv['results'][0]['features'][0]
                 rv_page = rv['pagination']
@@ -675,6 +690,7 @@ def test_api(self) -> None:
                 self.app.get(url_for('api_03.subunits', id_=place.id)),
                 self.app.get(
                     url_for('api_03.subunits', id_=place.id, download=True))]:
+                assert 'application/json' in rv.headers.get('Content-Type')
                 rv = rv.get_json()[str(place.id)]
                 for item in rv:
                     if item['id'] == place.id:
@@ -739,6 +755,7 @@ def test_api(self) -> None:
                     centroid=True,
                     limit=0))]:
                 assert b'(autogenerated)' in rv.data
+                assert 'application/json' in rv.headers.get('Content-Type')
 
             # Test Error Handling
             for rv in [