prevent cached responses

app.py

@@ -32,6 +32,19 @@ item6 = 0
 
 app.logger.info('Starting erdbeerhannah v' + version)
 
+# prevent cached responses
+@app.after_request
+def add_header(r):
+    """
+    Add headers to both force latest IE rendering engine or Chrome Frame,
+    and also to cache the rendered page for 10 minutes.
+    """
+    r.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
+    r.headers["Pragma"] = "no-cache"
+    r.headers["Expires"] = "0"
+    r.headers['Cache-Control'] = 'public, max-age=0'
+    return r
+
 @app.route("/", methods=["GET", "POST"])
 def index():
     global gesamtwert, item1, item2, item3, item4, item5, item6, sum, givenfloat, change, given, background, postcounter, version