Do env variable handling outside of template.

httpbin/core.py

@@ -92,8 +92,8 @@ def set_cors_headers(response):
 @app.route('/')
 def view_landing_page():
     """Generates Landing Page."""
-
-    return render_template('index.html', env=os.environ)
+    tracking_enabled = 'HTTPBIN_TRACKING' in os.environ
+    return render_template('index.html', tracking_enabled=tracking_enabled)
 
 
 @app.route('/html')

httpbin/templates/index.html

@@ -56,7 +56,7 @@
 
 {% include 'httpbin.1.html' %}
 
-{% if env.get('HTTPBIN_TRACKING', '0') == '1' %}
+{% if tracking_enabled %}
     {% include 'trackingscripts.html' %}
 {% endif %}