api: fix content type of reverse geocoding responses (#22580)

tests/test_api.py

@@ -2034,10 +2034,11 @@ def test_get_secret_and_orig(no_request_pub):
 
 def test_reverse_geocoding(pub):
     with mock.patch('qommon.misc.urlopen') as urlopen:
-        urlopen.side_effect = lambda *args: StringIO('xxx')
+        urlopen.side_effect = lambda *args: StringIO(json.dumps({'address': 'xxx'}))
         get_app(pub).get('/api/reverse-geocoding', status=400)
         resp = get_app(pub).get('/api/reverse-geocoding?lat=0&lon=0')
-        assert resp.body == 'xxx'
+        assert resp.content_type == 'application/json'
+        assert resp.body == json.dumps({'address': 'xxx'})
         assert urlopen.call_args[0][0] == 'http://nominatim.openstreetmap.org/reverse?zoom=18&format=json&addressdetails=1&lat=0&lon=0&accept-language=en'
 
         pub.site_options.add_section('options')

wcs/api.py

@@ -678,6 +678,7 @@ class ApiDirectory(Directory):
     code = ApiTrackingCodeDirectory()
 
     def reverse_geocoding(self):
+        get_response().set_content_type('application/json')
         try:
             lat = get_request().form['lat']
             lon = get_request().form['lon']