#87 remove version pins for markupsafe, flask and werkzeug

also remove dependency on flask-api

cellxgene_gateway/subprocess_backend.py

@@ -10,7 +10,7 @@
 import logging
 import subprocess
 
-from flask_api import status
+from http import HTTPStatus
 
 from cellxgene_gateway.cache_entry import CacheEntryStatus
 from cellxgene_gateway.dir_util import make_annotations
@@ -76,10 +76,10 @@ class SubprocessBackend:
                     or "Could not open file" in stderr
                 ):
                     message = "File was invalid."
-                    http_status = status.HTTP_400_BAD_REQUEST
+                    http_status = HTTPStatus.BAD_REQUEST
                 else:
                     message = "Cellxgene failed to launch dataset."
-                    http_status = status.HTTP_500_INTERNAL_SERVER_ERROR
+                    http_status = HTTPStatus.INTERNAL_SERVER_ERROR
 
                 cache_entry.status = CacheEntryStatus.error
                 cache_entry.set_error(message, stderr, http_status)