Fixed imports and added debugging route.

samples/multi_tenant_app.py

@@ -12,7 +12,7 @@
 from flask import Flask, request, jsonify
 from http.client import HTTPConnection
 
-from _base_api import UnauthorizedError
+from c8y_api._base_api import UnauthorizedError
 from c8y_api.app import MultiTenantCumulocityApp
 
 
@@ -52,6 +52,15 @@ def health():
     return jsonify({'status': 'ok'})
 
 
+@webapp.route("/debug")
+def debug():
+    """Return debug information."""
+    return jsonify({
+        'headers': dict(request.headers),
+        'cookies': dict(request.cookies),
+    })
+
+
 @webapp.route("/tenant")
 def tenant_info():
     """Return subscribed tenant's ID, username and devices it has access to."""