diff --git a/swh/web/ui/views/browse.py b/swh/web/ui/views/browse.py
--- a/swh/web/ui/views/browse.py
+++ b/swh/web/ui/views/browse.py
@@ -6,6 +6,10 @@
 from encodings.aliases import aliases
 from flask import render_template, request, url_for, redirect
 
+from werkzeug.exceptions import BadRequest
+
+from functools import wraps
+
 from flask.ext.api.decorators import set_renderers
 from flask.ext.api.renderers import HTMLRenderer
 
@@ -18,6 +22,26 @@
 hash_filter_keys = ALGORITHMS
 
 
+class arg_checker(object):
+    """
+    Check argument names provided. If they are not present or None,
+    then the client sent a request with missing arguments, so we return
+    a 400 BAD REQUEST
+    """
+    def __init__(self, *name_check):
+        self.name_check = name_check
+
+    def __call__(self, func):
+        @wraps(func)
+        def wrapped_func(*func_args, **func_kwargs):
+            print(app)
+            for arg in self.name_check:
+                if func_kwargs.get(arg) is None:
+                    return BadRequest()
+            return func(*func_args, **func_kwargs)
+        return wrapped_func
+
+
 @app.route('/search/', methods=['GET', 'POST'])
 @set_renderers(HTMLRenderer)
 def search():
@@ -38,7 +62,6 @@
     TODO:
         Batch-process with all checksums, not just sha1
     """
-
     env = {'search_res': None,
            'search_stats': None,
            'message': []}
@@ -74,7 +97,6 @@
     return render_template('search.html', **env)
 
 
-@app.route('/browse/content/')
 @app.route('/browse/content/<string:q>/')
 @set_renderers(HTMLRenderer)
 def browse_content(q):
@@ -192,7 +214,6 @@
     return render_template('content-with-origin.html', **env)
 
 
-@app.route('/browse/directory/')
 @app.route('/browse/directory/<string:sha1_git>/')
 @app.route('/browse/directory/<string:sha1_git>/<path:path>/')
 @set_renderers(HTMLRenderer)
@@ -239,7 +260,6 @@
     return render_template('directory.html', **env)
 
 
-@app.route('/browse/origin/')
 @app.route('/browse/origin/<int:origin_id>/')
 @set_renderers(HTMLRenderer)
 def browse_origin(origin_id):
@@ -263,7 +283,6 @@
     return render_template('origin.html', **env)
 
 
-@app.route('/browse/person/')
 @app.route('/browse/person/<int:person_id>/')
 @set_renderers(HTMLRenderer)
 def browse_person(person_id):
@@ -282,7 +301,6 @@
     return render_template('person.html', **env)
 
 
-@app.route('/browse/release/')
 @app.route('/browse/release/<string:sha1_git>/')
 @set_renderers(HTMLRenderer)
 def browse_release(sha1_git):
@@ -302,7 +320,6 @@
     return render_template('release.html', **env)
 
 
-@app.route('/browse/revision/')
 @app.route('/browse/revision/<string:sha1_git>/')
 @app.route('/browse/revision/<string:sha1_git>/prev/<path:prev_sha1s>/')
 @set_renderers(HTMLRenderer)
@@ -323,7 +340,6 @@
     Example:
         GET /browse/revision/
     """
-
     env = {'sha1_git': sha1_git,
            'message': None,
            'revision': None}
@@ -333,7 +349,6 @@
         env['revision'] = utils.prepare_data_for_view(rev)
     except (NotFoundExc, BadInputExc) as e:
         env['message'] = str(e)
-
     return render_template('revision.html', **env)
 
 
@@ -377,8 +392,6 @@
 
 
 @app.route('/browse/revision'
-           '/origin/log/')
-@app.route('/browse/revision'
            '/origin/<int:origin_id>/log/')
 @app.route('/browse/revision'
            '/origin/<int:origin_id>'