diff --git a/app/decorators.py b/app/decorators.py
index a9c67fc5e..cc637f81e 100644
--- a/app/decorators.py
+++ b/app/decorators.py
@@ -62,7 +62,14 @@ class ZRequest(object):
                 if k.endswith(":list"):
                     self.form[k[:-5]] = request.form.getlist(k)
         elif request.method == "GET":
-            self.form = {k: v for (k, v) in request.args.items()}
+            self.form = {}
+            for k in request.args:
+                current_app.logger.debug("%s\t%s" % (k, request.args.getlist(k)))
+                if k.endswith(":list"):
+                    self.form[k[:-5]] = request.args.getlist(k)
+                else:
+                    self.form[k] = request.args[k]
+            current_app.logger.info("ZRequest.form=%s" % str(self.form))
         self.RESPONSE = ZResponse()
 
     def __str__(self):
diff --git a/app/main/routes.py b/app/main/routes.py
index 093ad7758..89264112c 100644
--- a/app/main/routes.py
+++ b/app/main/routes.py
@@ -45,7 +45,7 @@ except ImportError:
 import flask
 from flask import request, render_template, redirect
 from flask_login import login_required
-
+import werkzeug
 
 from app.main import bp
 from app.decorators import scodoc7func, admin_required
@@ -65,7 +65,11 @@ context = None  # temporaire pour #sco8
 @bp.route("/index")
 def index():
     return render_template(
-        "main/index.html", title=u"Essai Flask", current_app=flask.current_app
+        "main/index.html",
+        title=u"Essai Flask",
+        current_app=flask.current_app,
+        flask=flask,
+        werzeug=werkzeug,
     )
 
 
diff --git a/app/scodoc/sco_saisie_notes.py b/app/scodoc/sco_saisie_notes.py
index 08101e122..80ee1a56f 100644
--- a/app/scodoc/sco_saisie_notes.py
+++ b/app/scodoc/sco_saisie_notes.py
@@ -455,7 +455,9 @@ def _notes_add(context, uid, evaluation_id, notes, comment=None, do_it=True):
     Return number of changed notes
     """
     uid = str(uid)
-    now = psycopg2.Timestamp(*time.localtime()[:6])  # datetime.datetime.now().isoformat()
+    now = psycopg2.Timestamp(
+        *time.localtime()[:6]
+    )  # datetime.datetime.now().isoformat()
     # Verifie inscription et valeur note
     _ = {}.fromkeys(
         sco_groups.do_evaluation_listeetuds_groups(
@@ -1194,6 +1196,7 @@ def _form_saisie_notes(context, E, M, group_ids, destination="", REQUEST=None):
         initvalues=initvalues,
         submitlabel="Terminer",
         formid="formnotes",
+        method="GET",
     )
     H.append(tf.getform())  # check and init
     if tf.canceled():
diff --git a/app/scodoc/sco_utils.py b/app/scodoc/sco_utils.py
index cae6f53a6..c78f2084c 100644
--- a/app/scodoc/sco_utils.py
+++ b/app/scodoc/sco_utils.py
@@ -537,10 +537,6 @@ def sendPDFFile(REQUEST, data, filename):
 
 class ScoDocJSONEncoder(json.JSONEncoder):
     def default(self, o):  # pylint: disable=E0202
-        # ScoDoc 7.22 n'utilise plus mx:
-        if str(type(o)) == "<type 'mx.DateTime.DateTime'>":
-            log("Warning: mx.DateTime object detected !")
-            return o.strftime("%Y-%m-%dT%H:%M:%S")
         if isinstance(o, (datetime.date, datetime.datetime)):
             return o.isoformat()
         elif isinstance(o, ApoEtapeVDI):
@@ -550,7 +546,7 @@ class ScoDocJSONEncoder(json.JSONEncoder):
 
 
 def sendJSON(REQUEST, data):
-    js = json.dumps(data, encoding=SCO_ENCODING, indent=1, cls=ScoDocJSONEncoder)
+    js = json.dumps(data, indent=1, cls=ScoDocJSONEncoder)
     if REQUEST:
         REQUEST.RESPONSE.setHeader("content-type", JSON_MIMETYPE)
     return js
diff --git a/app/templates/essais/testcheckbox.html b/app/templates/essais/testcheckbox.html
new file mode 100644
index 000000000..5bd3e339e
--- /dev/null
+++ b/app/templates/essais/testcheckbox.html
@@ -0,0 +1,25 @@
+{% extends 'base.html' %}
+
+{% block app_content %}
+
+<h1>Essai checkbox</h1>
+
+<p>
+    <tt>request.args={{ request.args }}</tt>
+</p>
+<form method="get">
+    <fieldset>
+        <legend>Choose your interests</legend>
+        <div>
+            <input type="checkbox" id="coding" name="interest" value="coding">
+            <label for="coding">Coding</label>
+        </div>
+        <div>
+            <input type="checkbox" id="music" name="interest" value="music">
+            <label for="music">Music</label>
+        </div>
+    </fieldset>
+    <input type="submit" name="OK" />
+</form>
+
+{% endblock %}
\ No newline at end of file
diff --git a/app/templates/main/index.html b/app/templates/main/index.html
index ac9bcebf9..a09a0ab0f 100644
--- a/app/templates/main/index.html
+++ b/app/templates/main/index.html
@@ -12,6 +12,10 @@
 
     <h2>Essais divers</h2>
 
+    <p>
+        <tt>flask v{{ flask.__version__ }}</tt><br />
+        <tt>werzeug v{{ werzeug.__version__ }}</tt>
+    </p>
     <h3>Avec login requis</h3>
     <ul>
         <li><a href="{{ url_for('main.test_vue') }}"><tt>test_vue</tt>, login requis</a></li>
diff --git a/app/views/essais.py b/app/views/essais.py
index 1a49cadc4..e82cd6b07 100644
--- a/app/views/essais.py
+++ b/app/views/essais.py
@@ -5,8 +5,12 @@ Module Essais: divers essais pour la migration vers Flask
 Emmanuel Viennet, 2021
 """
 
+import flask
+
 from flask import g
 from flask import current_app
+from flask import render_template
+from flask import request
 
 from app.decorators import (
     scodoc7func,
@@ -79,9 +83,13 @@ def sco_test_view(REQUEST=None):
     return """Vous avez vu sco_test_view !"""
 
 
-import flask
-
-
 @bp.route("/essrep")
 def essrep():
     return flask.Response(status=200, response="Bonjour pépé %s" + u"papa")
+
+
+# Tests formulaires avec checkbox et GET
+@bp.route("/testcheckbox", methods=["GET"])
+def testcheckbox():
+    # args = request.args
+    return render_template("essais/testcheckbox.html")