try wildcard

app.py

@@ -17,7 +17,7 @@ def home():
     return render_template('index.html')
 
 
-@app.route('/summarize', methods=['POST'])
+@app.route('*/summarize', methods=['POST'])
 @cross_origin()
 def recommend():
     if request.method == "POST":
@@ -42,7 +42,7 @@ def recommend():
     pass
 
 
-@app.route('/summarize', methods=['OPTIONS'])
+@app.route('*/summarize', methods=['OPTIONS'])
 def preflight():
     resp = make_response("OK")
     resp.status_code = 201