diff --git a/common/lib/capa/capa/responsetypes.py b/common/lib/capa/capa/responsetypes.py
index 034753d5fd..d995e8b902 100644
--- a/common/lib/capa/capa/responsetypes.py
+++ b/common/lib/capa/capa/responsetypes.py
@@ -848,12 +848,13 @@ class CodeResponse(LoncapaResponse):
 
     def get_score(self, student_answers):
         try:
-            submission = student_answers[self.answer_id]
+            submission = student_answers[self.answer_id] # Note that submission can be a file
         except Exception as err:
-            log.error('Error in CodeResponse %s: cannot get student answer for %s; student_answers=%s' % (err, self.answer_id, student_answers))
+            log.error('Error in CodeResponse %s: cannot get student answer for %s; student_answers=%s' %
+                (err, self.answer_id, convert_files_to_filenames(student_answers)))
             raise Exception(err)
 
-        self.context.update({'submission': unicode(submission)}) # Submission could be a file
+        self.context.update({'submission': unicode(submission)})
 
         # Prepare xqueue request
         #------------------------------------------------------------ 
@@ -873,8 +874,13 @@ class CodeResponse(LoncapaResponse):
                     'edX_student_response': unicode(submission)}
         
         # Submit request
-        error = xqueue_interface.send_to_queue(header=xheader,
-                                               body=json.dumps(contents))
+        if hasattr(submission, 'read'): # Test for whether submission is a file
+            error = xqueue_interface.send_to_queue(header=xheader,
+                                                   body=json.dumps(contents),
+                                                   file_to_upload=submission)
+        else:
+            error = xqueue_interface.send_to_queue(header=xheader,
+                                                   body=json.dumps(contents))
 
         cmap = CorrectMap() 
         if error:
diff --git a/common/lib/capa/capa/xqueue_interface.py b/common/lib/capa/capa/xqueue_interface.py
index fa495d60a0..e479be3ed6 100644
--- a/common/lib/capa/capa/xqueue_interface.py
+++ b/common/lib/capa/capa/xqueue_interface.py
@@ -37,7 +37,7 @@ def make_xheader(lms_callback_url, lms_key, queue_name):
                         'queue_name': queue_name })
 
 
-def send_to_queue(header, body, xqueue_url=None):
+def send_to_queue(header, body, file_to_upload=None, xqueue_url=None):
     '''
     Submit a request to xqueue.
     
@@ -46,6 +46,8 @@ def send_to_queue(header, body, xqueue_url=None):
     body: Serialized data for the receipient behind the queueing service. The operation of
             xqueue is agnostic to the contents of 'body'
 
+    file_to_upload: File object to be uploaded to xqueue along with queue request
+
     Returns an 'error' flag indicating error in xqueue transaction
     '''
     if xqueue_url is None:
@@ -72,9 +74,13 @@ def send_to_queue(header, body, xqueue_url=None):
     #------------------------------------------------------------
     payload = {'xqueue_header': header,
                'xqueue_body'  : body}
+
+    files = None
+    if file_to_upload is not None:
+        files = { file_to_upload.name: file_to_upload }
+
     try:
-        # Send request
-        r = s.post(xqueue_url+'/xqueue/submit/', data=payload)
+        r = s.post(xqueue_url+'/xqueue/submit/', data=payload, files=files)
     except Exception as err:
         msg = 'Error in xqueue_interface.send_to_queue %s: Cannot connect to server url=%s' % (err, xqueue_url)
         raise Exception(msg)