diff --git a/app.py b/app.py
index a215fa9..4fc4493 100644
--- a/app.py
+++ b/app.py
@@ -114,6 +114,7 @@ def start_code_flow():
                                           scopes, request.args.get("forceConsent", False),
                                           request.args.get("allowConsentOptionDeselection", False),
                                           request.args.get("responseType", "code"),
+                                          _config.get("response_mode", "query"),
                                           request.args.get("ui_locales"),
                                           request.args.get("max_age"),
                                           request.args.get("claims"),
@@ -301,26 +302,32 @@ def ajax_callback():
     return "ok"
 
 
-@_app.route('/callback')
+@_app.route('/callback', methods=["GET", "POST"])
 def oauth_callback():
     """
     Called when the resource owner is returning from the authorization server
     :return:redirect to / with user info stored in the session.
     """
+
+    if request.method == "GET":
+        params = request.args
+    else:
+        params = request.form
+
     if session.get("flow", None) != "code":
         # This is the callback for a hybrid or implicit flow
         return render_template('index.html')
 
-    if 'state' not in session or session['state'].decode() != request.args['state']:
+    if 'state' not in session or session['state'].decode() != params['state']:
         return create_error('Missing or invalid state')
 
     if "code_verifier" not in session:
         return create_error("No code_verifier in session")
 
-    if 'code' not in request.args:
+    if 'code' not in params:
         return create_error('No code in response')
 
-    user = callback(request.args)
+    user = callback(params)
 
     session['session_id'] = generate_random_string()
     _session_store[session['session_id']] = user
diff --git a/client.py b/client.py
index ad98c51..a975789 100644
--- a/client.py
+++ b/client.py
@@ -183,7 +183,7 @@ def refresh(self, refresh_token):
         return json.loads(token_response.read())
 
     def get_authn_req_url(self, session, acr, forceAuthN, scope, forceConsent, allowConsentOptionDeselection,
-                          response_type, ui_locales, max_age, claims, send_parameters_via):
+                          response_type, response_mode, ui_locales, max_age, claims, send_parameters_via):
         """
         :param session: the session, will be used to keep the OAuth state
         :param acr: The acr to request
@@ -199,6 +199,7 @@ def get_authn_req_url(self, session, acr, forceAuthN, scope, forceConsent, allow
 
         request_args = {'scope': scope,
                         'response_type': response_type,
+                        'response_mode': response_mode,
                         'client_id': self.config['client_id'],
                         'state': state,
                         'code_challenge': code_challenge,
diff --git a/settings.json b/settings.json
index bfe3362..bfad28e 100644
--- a/settings.json
+++ b/settings.json
@@ -5,6 +5,7 @@
   "debug": true,
   "scope": "openid profile email address phone",
   "send_parameters_via": "query",
+  "response_mode": "query",
   "client_id": "python-client",
   "client_secret": "Password1",
   "redirect_uri": "https://localhost:5443/callback",