diff --git a/app/scodoc/html_sco_header.py b/app/scodoc/html_sco_header.py
index 9f537be831..76e8727ab8 100644
--- a/app/scodoc/html_sco_header.py
+++ b/app/scodoc/html_sco_header.py
@@ -140,7 +140,7 @@ def sco_header(
     init_google_maps=False,  # Google maps
     init_datatables=True,
     titrebandeau="",  # titre dans bandeau superieur
-    head_message="",  # message action (petit cadre jaune en haut)
+    head_message="",  # message action (petit cadre jaune en haut) DEPRECATED
     user_check=True,  # verifie passwords temporaires
     etudid=None,
     formsemestre_id=None,
diff --git a/app/scodoc/sco_archives.py b/app/scodoc/sco_archives.py
index fce36c22ce..dea28b74c8 100644
--- a/app/scodoc/sco_archives.py
+++ b/app/scodoc/sco_archives.py
@@ -342,11 +342,11 @@ def do_formsemestre_archive(
         formsemestre, res, include_evaluations=True
     )
     if table_html:
+        flash(f"Moyennes archivées le {date}", category="info")
         data = "\n".join(
             [
                 html_sco_header.sco_header(
                     page_title=f"Moyennes archivées le {date}",
-                    head_message=f"Moyennes archivées le {date}",
                     no_side_bar=True,
                 ),
                 f'<h2 class="fontorange">Valeurs archivées le {date}</h2>',
diff --git a/app/scodoc/sco_archives_etud.py b/app/scodoc/sco_archives_etud.py
index 2718921497..1ca8eecefe 100644
--- a/app/scodoc/sco_archives_etud.py
+++ b/app/scodoc/sco_archives_etud.py
@@ -30,7 +30,7 @@
      les dossiers d'admission et autres pièces utiles.
 """
 import flask
-from flask import url_for, render_template
+from flask import flash, render_template, url_for
 from flask import g, request
 from flask_login import current_user
 
@@ -38,7 +38,6 @@ import app.scodoc.sco_utils as scu
 from app.scodoc import sco_import_etuds
 from app.scodoc import sco_groups
 from app.scodoc import sco_trombino
-from app.scodoc import sco_excel
 from app.scodoc import sco_archives
 from app.scodoc.sco_permissions import Permission
 from app.scodoc.sco_exceptions import AccessDenied, ScoValueError
@@ -233,13 +232,9 @@ def etud_delete_archive(etudid, archive_name, dialog_confirmed=False):
         )
 
     EtudsArchive.delete_archive(archive_id)
+    flash("Archive supprimée")
     return flask.redirect(
-        url_for(
-            "scolar.ficheEtud",
-            scodoc_dept=g.scodoc_dept,
-            etudid=etudid,
-            head_message="Archive%20supprimée",
-        )
+        url_for("scolar.ficheEtud", scodoc_dept=g.scodoc_dept, etudid=etudid)
     )
 
 
diff --git a/app/scodoc/sco_etape_apogee_view.py b/app/scodoc/sco_etape_apogee_view.py
index 35be5a66c0..b53fe5e021 100644
--- a/app/scodoc/sco_etape_apogee_view.py
+++ b/app/scodoc/sco_etape_apogee_view.py
@@ -32,7 +32,7 @@ import io
 from zipfile import ZipFile
 
 import flask
-from flask import url_for, g, send_file, request
+from flask import flash, g, request, send_file, url_for
 
 import app.scodoc.sco_utils as scu
 from app import log
@@ -692,8 +692,10 @@ def view_apo_csv_delete(etape_apo="", semset_id="", dialog_confirmed=False):
     )
     if info:
         sco_etape_apogee.apo_csv_delete(info["archive_id"])
-        return flask.redirect(dest_url + "&head_message=Archive%20supprimée")
-    return flask.redirect(dest_url + "&head_message=Archive%20inexistante")
+        flash("Archive supprimée")
+        return flask.redirect(dest_url)
+    flash("Archive inexistante", category="error")
+    return flask.redirect(dest_url)
 
 
 def view_apo_csv(etape_apo="", semset_id="", format="html"):
diff --git a/app/scodoc/sco_formsemestre_edit.py b/app/scodoc/sco_formsemestre_edit.py
index 999fd52535..d64bf4d9c3 100644
--- a/app/scodoc/sco_formsemestre_edit.py
+++ b/app/scodoc/sco_formsemestre_edit.py
@@ -1179,9 +1179,13 @@ def formsemestre_clone(formsemestre_id):
             clone_evaluations=tf[2]["clone_evaluations"],
             clone_partitions=tf[2]["clone_partitions"],
         )
+        flash("Nouveau semestre créé")
         return flask.redirect(
-            "formsemestre_status?formsemestre_id=%s&head_message=Nouveau%%20semestre%%20créé"
-            % new_formsemestre_id
+            url_for(
+                "notes.formsemestre_status",
+                scodoc_dept=g.scodoc_dept,
+                formsemestre_id=new_formsemestre_id,
+            )
         )
 
 
@@ -1364,7 +1368,8 @@ def formsemestre_delete2(formsemestre_id, dialog_confirmed=False):
         )
     # Bon, s'il le faut...
     do_formsemestre_delete(formsemestre_id)
-    return flask.redirect(scu.ScoURL() + "?head_message=Semestre%20supprimé")
+    flash("Semestre supprimé !")
+    return flask.redirect(scu.ScoURL())
 
 
 def formsemestre_has_decisions_or_compensations(formsemestre: FormSemestre):
diff --git a/app/scodoc/sco_preferences.py b/app/scodoc/sco_preferences.py
index 5a659bc85f..b77ee34b73 100644
--- a/app/scodoc/sco_preferences.py
+++ b/app/scodoc/sco_preferences.py
@@ -111,7 +111,7 @@ get_base_preferences(formsemestre_id)
 
 """
 import flask
-from flask import g, request, current_app
+from flask import flash, g, request
 
 # from flask_login import current_user
 
@@ -2115,7 +2115,8 @@ class BasePreferences(object):
             for pref in self.prefs_definition:
                 self.prefs[None][pref[0]] = tf[2][pref[0]]
             self.save()
-            return flask.redirect(scu.ScoURL() + "?head_message=Préférences modifiées")
+            flash("Préférences modifiées")
+            return flask.redirect(scu.ScoURL())
 
     def build_tf_form(self, categories: list[str] = None, formsemestre_id: int = None):
         """Build list of elements for TrivialFormulator.
@@ -2287,7 +2288,8 @@ function set_global_pref(el, pref_name) {
         if tf[0] == 0:
             return "\n".join(H) + tf[1] + html_sco_header.sco_footer()
         elif tf[0] == -1:
-            return flask.redirect(dest_url + "&head_message=Annulé")  # cancel
+            flash("Annulé")
+            return flask.redirect(dest_url)
         else:
             # Supprime pref locale du semestre (retour à la valeur globale)
             if tf[2]["suppress"]:
@@ -2299,7 +2301,7 @@ function set_global_pref(el, pref_name) {
                     self.formsemestre_id, tf[2]["create_local"], cur_value
                 )
             # Modifie valeurs:
-            for (pref_name, descr) in self.base_prefs.prefs_definition:
+            for pref_name, descr in self.base_prefs.prefs_definition:
                 if (
                     pref_name in tf[2]
                     and not descr.get("only_global", False)
@@ -2321,7 +2323,8 @@ function set_global_pref(el, pref_name) {
             # done: change prefs and redirect to semestre status
             destination = tf[2]["destination"]
             if destination == "done" or destination == "":
-                return flask.redirect(dest_url + "&head_message=Préférences modifiées")
+                flash("Préférences modifiées")
+                return flask.redirect(dest_url)
             elif destination == "again":
                 return flask.redirect(
                     request.base_url + "?formsemestre_id=" + str(self.formsemestre_id)
diff --git a/app/views/notes.py b/app/views/notes.py
index 046e078f10..9753542ea9 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -1193,12 +1193,12 @@ def edit_moduleimpl_expr(moduleimpl_id):
         sco_cache.invalidate_formsemestre(
             formsemestre_id=sem["formsemestre_id"]
         )  # > modif regle calcul
+        flash("règle de calcul modifiée")
         return flask.redirect(
             url_for(
                 "notes.moduleimpl_status",
                 scodoc_dept=g.scodoc_dept,
                 moduleimpl_id=moduleimpl_id,
-                head_message="règle%20de%20calcul%20modifiée",
             )
         )
 
@@ -1321,7 +1321,6 @@ def delete_ue_expr(formsemestre_id: int, ue_id: int):
             "notes.formsemestre_status",
             scodoc_dept=g.scodoc_dept,
             formsemestre_id=formsemestre_id,
-            head_message="formule supprimée",
         )
     )
 
@@ -2009,7 +2008,7 @@ def formsemestre_bulletins_choice(
       """,
     ]
     H.append("""<select name="version" class="noprint">""")
-    for (version, description) in (
+    for version, description in (
         ("short", "Version courte"),
         ("selectedevals", "Version intermédiaire"),
         ("long", "Version complète"),
diff --git a/app/views/scolar.py b/app/views/scolar.py
index 8f46df0e9f..6268c7e20b 100644
--- a/app/views/scolar.py
+++ b/app/views/scolar.py
@@ -730,12 +730,12 @@ def doSuppressAnnotation(etudid, annotation_id):
     logdb(cnx, method="SuppressAnnotation", etudid=etudid)
     sco_etud.etud_annotations_delete(cnx, annotation_id)
 
+    flash("Annotation supprimée")
     return flask.redirect(
         url_for(
             "scolar.ficheEtud",
             scodoc_dept=g.scodoc_dept,
             etudid=etudid,
-            head_message="Annotation%%20supprimée",
         )
     )
 
@@ -895,6 +895,7 @@ sco_publish(
     methods=["GET", "POST"],
 )
 
+
 # Nouvel éditeur de partitions et groupe, @SebL Jul 2022
 @bp.route("/partition_editor", methods=["GET", "POST"])
 @scodoc
@@ -1801,7 +1802,8 @@ def etudident_delete(etudid, dialog_confirmed=False):
     to_inval = [s["formsemestre_id"] for s in etud["sems"]]
     for formsemestre_id in to_inval:
         sco_cache.invalidate_formsemestre(formsemestre_id=formsemestre_id)  # >
-    return flask.redirect(scu.ScoURL() + r"?head_message=Etudiant%20supprimé")
+    flash("Étudiant supprimé !")
+    return flask.redirect(scu.ScoURL())
 
 
 @bp.route("/check_group_apogee")
@@ -2266,7 +2268,7 @@ def formsemestre_import_etud_admission(formsemestre_id, import_email=True):
         )
     if changed_mails:
         H.append("<h3>Adresses mails modifiées:</h3>")
-        for (info, new_mail) in changed_mails:
+        for info, new_mail in changed_mails:
             H.append(
                 "%s: <tt>%s</tt> devient <tt>%s</tt><br>"
                 % (info["nom"], info["email"], new_mail)
@@ -2286,6 +2288,7 @@ sco_publish(
     Permission.ScoEtudChangeAdr,
 )
 
+
 # --- Statistiques
 @bp.route("/stat_bac")
 @scodoc