diff --git a/swh/web/api/apiresponse.py b/swh/web/api/apiresponse.py
--- a/swh/web/api/apiresponse.py
+++ b/swh/web/api/apiresponse.py
@@ -13,7 +13,7 @@
 from swh.storage.exc import StorageDBError, StorageAPIError
 
 from swh.web.api import utils
-from swh.web.common.exc import NotFoundExc, ForbiddenExc
+from swh.web.common.exc import NotFoundExc, ForbiddenExc, BadInputExc
 from swh.web.common.utils import shorten_path, gen_path_info
 from swh.web.config import get_config
 
@@ -164,8 +164,10 @@
         doc_data: documentation data for HTML response
 
     """
-    error_code = 400
-    if isinstance(error, NotFoundExc):
+    error_code = 500
+    if isinstance(error, BadInputExc):
+        error_code = 400
+    elif isinstance(error, NotFoundExc):
         error_code = 404
     elif isinstance(error, ForbiddenExc):
         error_code = 403
diff --git a/swh/web/tests/api/test_apidoc.py b/swh/web/tests/api/test_apidoc.py
--- a/swh/web/tests/api/test_apidoc.py
+++ b/swh/web/tests/api/test_apidoc.py
@@ -6,8 +6,11 @@
 from rest_framework.test import APITestCase
 from rest_framework.response import Response
 
+from swh.storage.exc import StorageDBError, StorageAPIError
+
 from swh.web.api.apidoc import api_doc, _parse_httpdomain_doc
 from swh.web.api.apiurls import api_route
+from swh.web.common.exc import BadInputExc, ForbiddenExc, NotFoundExc
 from swh.web.tests.testcase import WebTestCase
 
 # flake8: noqa
@@ -58,6 +61,15 @@
 
 class APIDocTestCase(WebTestCase, APITestCase):
 
+    exception_http_code = {
+        BadInputExc: 400,
+        ForbiddenExc: 403,
+        NotFoundExc: 404,
+        Exception: 500,
+        StorageAPIError: 503,
+        StorageDBError: 503,
+    }
+
     def test_apidoc_nodoc_failure(self):
         with self.assertRaises(Exception):
             @api_doc('/my/nodoc/url/')
@@ -90,6 +102,26 @@
         # then
         self.assertEqual(rv.status_code, 200, rv.data)
 
+    @staticmethod
+    @api_route(r'/test/error/(?P<exc_name>.+)/',
+               'test-error')
+    @api_doc('/test/error/')
+    def apidoc_test_error_route(request, exc_name):
+        """
+        Sample doc
+        """
+        for e in APIDocTestCase.exception_http_code.keys():
+            if e.__name__ == exc_name:
+                raise e('Error')
+
+    def test_apidoc_error(self):
+        for exc, code in self.exception_http_code.items():
+            # when
+            rv = self.client.get('/api/1/test/error/%s/' % exc.__name__)
+
+            # then
+            self.assertEqual(rv.status_code, code)
+
     @staticmethod
     @api_route(r'/some/full/(?P<myarg>[0-9]+)/(?P<myotherarg>[0-9]+)/',
                'some-complete-doc-route')
diff --git a/swh/web/tests/api/views/test_origin.py b/swh/web/tests/api/views/test_origin.py
--- a/swh/web/tests/api/views/test_origin.py
+++ b/swh/web/tests/api/views/test_origin.py
@@ -12,6 +12,7 @@
 
 from swh.storage.exc import StorageDBError, StorageAPIError
 
+from swh.web.common.exc import BadInputExc
 from swh.web.common.utils import reverse
 from swh.web.common.origin_visits import get_origin_visits
 from swh.web.tests.strategies import (
@@ -55,7 +56,7 @@
 
         err_msg = 'voluntary error to check the bad request middleware.'
 
-        mock_get_origin_visits.side_effect = ValueError(err_msg)
+        mock_get_origin_visits.side_effect = BadInputExc(err_msg)
 
         url = reverse(
             'api-1-origin-visits', url_args={'origin_url': 'http://foo'})
@@ -64,7 +65,7 @@
         self.assertEqual(rv.status_code, 400, rv.data)
         self.assertEqual(rv['Content-Type'], 'application/json')
         self.assertEqual(rv.data, {
-            'exception': 'ValueError',
+            'exception': 'BadInputExc',
             'reason': err_msg})
 
     @patch('swh.web.api.views.origin.get_origin_visits')
diff --git a/swh/web/tests/api/views/test_stat.py b/swh/web/tests/api/views/test_stat.py
--- a/swh/web/tests/api/views/test_stat.py
+++ b/swh/web/tests/api/views/test_stat.py
@@ -8,6 +8,7 @@
 
 from swh.storage.exc import StorageDBError, StorageAPIError
 
+from swh.web.common.exc import BadInputExc
 from swh.web.common.utils import reverse
 from swh.web.tests.testcase import WebTestCase
 
@@ -16,7 +17,7 @@
     @patch('swh.web.api.views.stat.service')
     def test_api_1_stat_counters_raise_error(self, mock_service):
 
-        mock_service.stat_counters.side_effect = ValueError(
+        mock_service.stat_counters.side_effect = BadInputExc(
             'voluntary error to check the bad request middleware.')
 
         url = reverse('api-1-stat-counters')
@@ -25,7 +26,7 @@
         self.assertEqual(rv.status_code, 400, rv.data)
         self.assertEqual(rv['Content-Type'], 'application/json')
         self.assertEqual(rv.data, {
-            'exception': 'ValueError',
+            'exception': 'BadInputExc',
             'reason': 'voluntary error to check the bad request middleware.'})
 
     @patch('swh.web.api.views.stat.service')