Setting up compression using flask-compress (#4543)

setup.py

@@ -59,6 +59,7 @@ setup(
         'flask-cache==0.13.1',
         'flask-migrate==2.1.1',
         'flask-script==2.0.6',
+        'flask-compress==1.4.0',
         'flask-sqlalchemy==2.1',
         'flask-testing==0.7.1',
         'flask-wtf==0.14.2',

superset/__init__.py

@@ -13,6 +13,7 @@ import os
 from flask import Flask, redirect
 from flask_appbuilder import AppBuilder, IndexView, SQLA
 from flask_appbuilder.baseviews import expose
+from flask_compress import Compress
 from flask_migrate import Migrate
 from flask_wtf.csrf import CSRFProtect
 from werkzeug.contrib.fixers import ProxyFix
@@ -166,6 +167,9 @@ module_datasource_map = app.config.get('DEFAULT_MODULE_DS_MAP')
 module_datasource_map.update(app.config.get('ADDITIONAL_MODULE_DS_MAP'))
 ConnectorRegistry.register_sources(module_datasource_map)
 
+# Flask-Compress
+Compress(app)
+
 # Hook that provides administrators a handle on the Flask APP
 # after initialization
 flask_app_mutator = app.config.get('FLASK_APP_MUTATOR')