diff --git a/avisstage/views_search.py b/avisstage/views_search.py
index 5614055..448a2d3 100644
--- a/avisstage/views_search.py
+++ b/avisstage/views_search.py
@@ -11,12 +11,15 @@ from django.http import JsonResponse, HttpResponseBadRequest
 from django.shortcuts import render, redirect, get_object_or_404
 
 import json
+import logging
 
 from .documents import StageDocument
 from .models import Stage
 from .statics import TYPE_LIEU_OPTIONS, TYPE_STAGE_OPTIONS, NIVEAU_SCOL_OPTIONS
 
 
+logger = logging.getLogger("recherche")
+
 # Recherche
 class SearchForm(forms.Form):
     generique = forms.CharField(required=False)
@@ -146,7 +149,9 @@ def recherche_resultats(request):
             search_args = form.cleaned_data
 
             # Gestion du cache
-            cache_key = json.dumps(search_args, sort_keys=True)
+            lsearch_args = {key: val for key, val in search_args.items()
+                            if val != "" and val is not None}
+            cache_key = json.dumps(lsearch_args, sort_keys=True)
             cached = cache.get(cache_key)
             if cached is None:
                 # Requête effective
@@ -157,11 +162,13 @@ def recherche_resultats(request):
                 # Sauvegarde dans le cache
                 to_cache = {"stages": stageids, "lieux": lieux, "tri": tri}
                 cache.set(cache_key, to_cache, 600)
+                logger.info(cache_key)
             else:
                 # Lecture du cache
                 stageids = cached["stages"]
                 lieux = cached["lieux"]
                 tri = cached["tri"]
+                logger.info("recherche en cache")
 
             # Pagination
             paginator = Paginator(stageids, 25)
diff --git a/experiENS/settings_base.py b/experiENS/settings_base.py
index ca52a5e..ce60550 100644
--- a/experiENS/settings_base.py
+++ b/experiENS/settings_base.py
@@ -115,3 +115,23 @@ CAS_VERSION = 'CAS_2_SAML_1_0'
 
 LOGIN_URL = reverse_lazy('login')
 LOGOUT_URL = reverse_lazy('logout')
+
+
+LOGGING = {
+    'version': 1,
+    'disable_existing_loggers': False,
+    'handlers': {
+        'file': {
+            'level': 'INFO',
+            'class': 'logging.FileHandler',
+            'filename': os.path.join(BASE_DIR, 'recherche.log'),
+        },
+    },
+    'loggers': {
+        'recherche': {
+            'handlers': ['file'],
+            'level': 'INFO',
+            'propagate': True,
+        },
+    },
+}