--- a/cubicweb/web/test/data/views.py	Mon Feb 08 15:29:06 2016 +0100
+++ b/cubicweb/web/test/data/views.py	Mon Feb 08 15:37:52 2016 +0100
@@ -16,34 +16,36 @@
 # You should have received a copy of the GNU Lesser General Public License along
 # with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
 
+import hashlib
+
 from cubicweb.predicates import has_related_entities
 from cubicweb.web.views.ajaxcontroller import ajaxfunc
 from cubicweb.web.views.ibreadcrumbs import IBreadCrumbsAdapter
 
-def _recursive_replace_stream_by_content(tree):
+def _recursive_replace_stream_by_md5(tree):
     """ Search for streams (i.e. object that have a 'read' method) in a tree
-    (which branches are lists or tuples), and substitute them by their content,
+    (whose branches are lists or tuples), and substitute them by their md5 hash,
     leaving other leafs identical. A copy of the tree with only lists as
     branches is returned.
     """
     if not isinstance(tree, (list, tuple)):
         if hasattr(tree, 'read'):
-            return tree.read()
+            return hashlib.md5(tree.read()).hexdigest()
         return tree
     else:
-        return [_recursive_replace_stream_by_content(value)
+        return [_recursive_replace_stream_by_md5(value)
                 for value in tree]            
 
 
 @ajaxfunc(output_type='json')
 def fileupload(self):
     """ Return a json copy of the web request form in which uploaded files
-    are read and the received streams are replaced by their content.
+    are read and the received streams are replaced by their md5 hash.
     """
     try:
         result_dict = {}
         for key, value in self._cw.form.items():
-            result_dict[key] = _recursive_replace_stream_by_content(value)
+            result_dict[key] = _recursive_replace_stream_by_md5(value)
         return result_dict
     except Exception as ex:
         import traceback as tb

--- a/cubicweb/web/test/unittest_web.py	Mon Feb 08 15:29:06 2016 +0100
+++ b/cubicweb/web/test/unittest_web.py	Mon Feb 08 15:37:52 2016 +0100
@@ -19,6 +19,7 @@
 from json import loads
 from os.path import join
 import tempfile
+import hashlib
 
 try:
     import requests
@@ -75,13 +76,17 @@
         with self._fobject(fname) as f:
             return f.read()
 
+    def _fhash(self, fname):
+        content = self._fcontent(fname)
+        return hashlib.md5(content).hexdigest()
+
     def test_single_file_upload(self):
         files = {'file': ('schema.py', self._fobject('schema.py'))}
         webreq = requests.post(self._post_url, files=files)
         # check backward compat : a single uploaded file leads to a single
         # 2-uple in the request form
         expect = {'fname': u'fileupload',
-                  'file': ['schema.py', self._fcontent('schema.py')]}
+                  'file': ['schema.py', self._fhash('schema.py')]}
         self.assertEqual(webreq.status_code, 200)
         self.assertDictEqual(expect, loads(webreq.text))
 
@@ -90,8 +95,8 @@
                  ('files', ('views.py',  self._fobject('views.py')))]
         webreq = requests.post(self._post_url, files=files,)
         expect = {'fname': u'fileupload',
-                  'files': [['schema.py', self._fcontent('schema.py')],
-                            ['views.py', self._fcontent('views.py')]],}
+                  'files': [['schema.py', self._fhash('schema.py')],
+                            ['views.py', self._fhash('views.py')]],}
         self.assertEqual(webreq.status_code, 200)
         self.assertDictEqual(expect, loads(webreq.text))