diff --git a/swh/web/ui/backend.py b/swh/web/ui/backend.py
--- a/swh/web/ui/backend.py
+++ b/swh/web/ui/backend.py
@@ -185,7 +185,7 @@
     return []
 
 
-def revision_log(sha1_git_bin, limit=100):
+def revision_log(sha1_git_bin, limit):
     """Return information about the revision with sha1 sha1_git_bin.
 
     Args:
@@ -202,7 +202,7 @@
     return main.storage().revision_log([sha1_git_bin], limit)
 
 
-def revision_log_by(origin_id, branch_name, ts, limit=100):
+def revision_log_by(origin_id, branch_name, ts, limit):
     """Return information about the revision matching the timestamp
     ts, from origin origin_id, in branch branch_name.
 
@@ -215,12 +215,10 @@
         Information for the revision matching the criterions.
 
     """
-    rev_list = main.storage().revision_log_by(origin_id,
-                                              branch_name,
-                                              ts)
-    if rev_list is None:
-        return None
-    return rev_list[:limit]
+    return main.storage().revision_log_by(origin_id,
+                                          branch_name,
+                                          ts,
+                                          limit=limit)
 
 
 def stat_counters():
diff --git a/swh/web/ui/converters.py b/swh/web/ui/converters.py
--- a/swh/web/ui/converters.py
+++ b/swh/web/ui/converters.py
@@ -197,8 +197,8 @@
     """Convert swh content to serializable content dictionary.
 
     """
-    if content and 'ctime' in content:
-        del content['ctime']
+    if content:
+        content = {k: v for k, v in content.items() if k not in ['ctime']}
     return from_swh(content,
                     hashess={'sha1', 'sha1_git', 'sha256'},
                     bytess={},
diff --git a/swh/web/ui/service.py b/swh/web/ui/service.py
--- a/swh/web/ui/service.py
+++ b/swh/web/ui/service.py
@@ -271,7 +271,7 @@
     return converters.from_revision(res)
 
 
-def lookup_revision_log(rev_sha1_git, limit=25):
+def lookup_revision_log(rev_sha1_git, limit):
     """Return information about the revision with sha1 revision_sha1_git.
 
     Args:
@@ -294,7 +294,7 @@
     return map(converters.from_revision, revision_entries)
 
 
-def lookup_revision_log_by(origin_id, branch_name, timestamp, limit=25):
+def lookup_revision_log_by(origin_id, branch_name, timestamp, limit):
     """Return information about the revision with sha1 revision_sha1_git.
 
     Args:
diff --git a/swh/web/ui/tests/test_backend.py b/swh/web/ui/tests/test_backend.py
--- a/swh/web/ui/tests/test_backend.py
+++ b/swh/web/ui/tests/test_backend.py
@@ -532,12 +532,12 @@
         self.storage.revision_log = MagicMock(return_value=stub_revision_log)
 
         # when
-        actual_revision = backend.revision_log(sha1_bin)
+        actual_revision = backend.revision_log(sha1_bin, limit=1)
 
         # then
         self.assertEqual(list(actual_revision), stub_revision_log)
 
-        self.storage.revision_log.assert_called_with([sha1_bin], 100)
+        self.storage.revision_log.assert_called_with([sha1_bin], 1)
 
     @istest
     def revision_log_by(self):
@@ -571,11 +571,12 @@
             return_value=stub_revision_log)
 
         # when
-        actual_log = backend.revision_log_by(1, 'refs/heads/master', None)
+        actual_log = backend.revision_log_by(1, 'refs/heads/master',
+                                             None, limit=1)
 
         # then
         self.assertEqual(actual_log, stub_revision_log)
-        self.storage.revision_log.assert_called_with([sha1_bin], 100)
+        self.storage.revision_log.assert_called_with([sha1_bin], 1)
 
     @istest
     def revision_log_by_norev(self):
@@ -586,11 +587,12 @@
         self.storage.revision_log_by = MagicMock(return_value=None)
 
         # when
-        actual_log = backend.revision_log_by(1, 'refs/heads/master', None)
+        actual_log = backend.revision_log_by(1, 'refs/heads/master',
+                                             None, limit=1)
 
         # then
         self.assertEqual(actual_log, None)
-        self.storage.revision_log.assert_called_with([sha1_bin], 100)
+        self.storage.revision_log.assert_called_with([sha1_bin], 1)
 
     @istest
     def stat_counters(self):
diff --git a/swh/web/ui/tests/test_service.py b/swh/web/ui/tests/test_service.py
--- a/swh/web/ui/tests/test_service.py
+++ b/swh/web/ui/tests/test_service.py
@@ -1186,7 +1186,8 @@
 
         # when
         actual_revision = service.lookup_revision_log(
-            'abcdbe353ed3480476f032475e7c233eff7371d5')
+            'abcdbe353ed3480476f032475e7c233eff7371d5',
+            limit=25)
 
         # then
         self.assertEqual(list(actual_revision), [self.SAMPLE_REVISION])
diff --git a/swh/web/ui/views/api.py b/swh/web/ui/views/api.py
--- a/swh/web/ui/views/api.py
+++ b/swh/web/ui/views/api.py
@@ -5,7 +5,7 @@
 
 from types import GeneratorType
 
-from flask import request, url_for, Response, redirect
+from flask import request, url_for, Response
 
 from swh.web.ui import service, utils
 from swh.web.ui.exc import NotFoundExc