Send the Accept-Language header all the time

docs/backends.rst

@@ -41,7 +41,7 @@ Proctoring System configuration endpoint
     }
 
 The keys in the rules object should be machine readable. The values are human readable. PS should respect the HTTP request ``Accept-Language``
-header and translate all human readable rules into the requested language.
+header and translate all human readable rules and instructions into the requested language.
 
 If a download_url is included in the response, Open edX will redirect learners to the address before the proctoring session starts. The address will include ``attempt={attempt_id}`` in the query string.
 

edx_proctoring/backends/rest.py

@@ -203,17 +203,20 @@ def get_instructor_url(self, course_id, user, exam_id=None, attempt_id=None):
 
     def _get_language_headers(self):
         """
-        Makes the Accept-Language header based on the currently active language
+        Returns a dictionary of the Accept-Language headers
         """
+        # This import is here because developers writing backends which subclass this class
+        # may want to import this module and use the other methods, without having to run in the context
+        # of django settings, etc.
         from django.conf import settings
         from django.utils.translation import get_language
 
-        headers = {}
         current_lang = get_language()
         default_lang = settings.LANGUAGE_CODE
+        lang_header = default_lang
         if current_lang and current_lang != default_lang:
-            headers['Accept-Language'] = '{};{}'.format(current_lang, default_lang)
-        return headers
+            lang_header = '{};{}'.format(current_lang, default_lang)
+        return {'Accept-Language': lang_header}
 
     def _make_attempt_request(self, exam, attempt, method='POST', status=None, **payload):
         """

edx_proctoring/backends/tests/test_rest.py

@@ -8,6 +8,7 @@
 import responses
 
 from django.test import TestCase
+from django.utils.translation import activate
 
 from edx_proctoring.backends.rest import BaseRestProctoringProvider
 
@@ -88,10 +89,10 @@ def test_get_attempt(self):
         )
         external_attempt = self.provider.get_attempt(attempt)
         self.assertEqual(external_attempt, attempt)
+        self.assertEqual(responses.calls[1].request.headers['Accept-Language'], 'en-us')
 
     @responses.activate
     def test_get_attempt_i18n(self):
-        from django.utils.translation import activate
         activate('es')
         attempt = {
             'id': 1,