Allowing config flag to turn off flask-compress (#4617)

docs/installation.rst

@@ -173,6 +173,9 @@ work on Windows so the `superset runserver` command is not expected to work
 in that context. Also note that the development web
 server (`superset runserver -d`) is not intended for production use.
 
+If not using gunicorn, you may want to disable the use of flask-compress
+by setting `ENABLE_FLASK_COMPRESS = False` in your `superset_config.py`
+
 Flask-AppBuilder Permissions
 ----------------------------
 

superset/__init__.py

@@ -168,7 +168,8 @@ module_datasource_map.update(app.config.get('ADDITIONAL_MODULE_DS_MAP'))
 ConnectorRegistry.register_sources(module_datasource_map)
 
 # Flask-Compress
-Compress(app)
+if conf.get('ENABLE_FLASK_COMPRESS'):
+    Compress(app)
 
 # Hook that provides administrators a handle on the Flask APP
 # after initialization

superset/config.py

@@ -405,6 +405,10 @@ DB_CONNECTION_MUTATOR = None
 #        return "-- [SQL LAB] {username} {dttm}\n sql"(**locals())
 SQL_QUERY_MUTATOR = None
 
+# When not using gunicorn, (nginx for instance), you may want to disable
+# using flask-compress
+ENABLE_FLASK_COMPRESS = True
+
 try:
     if CONFIG_PATH_ENV_VAR in os.environ:
         # Explicitly import config module that is not in pythonpath; useful