diff --git a/tests/storage/test_http.py b/tests/storage/test_http.py
index 3737a00..d7ce961 100644
--- a/tests/storage/test_http.py
+++ b/tests/storage/test_http.py
@@ -16,7 +16,7 @@ from requests import Response
 class TestHttpStorage(object):
 
     def test_list(self, monkeypatch):
-        collection_url = 'http://127.0.0.1/calendar/collection/'
+        collection_url = 'http://127.0.0.1/calendar/collection.ics'
 
         items = [
             dedent(b'''
@@ -44,7 +44,8 @@ class TestHttpStorage(object):
             '\n'.join([b'BEGIN:VCALENDAR'] + items + [b'END:VCALENDAR'])
         ] * 2
 
-        def get(*a, **kw):
+        def get(url, *a, **kw):
+            assert url == collection_url
             r = Response()
             r.status_code = 200
             assert responses
diff --git a/vdirsyncer/storage/dav.py b/vdirsyncer/storage/dav.py
index 9367044..0c26162 100644
--- a/vdirsyncer/storage/dav.py
+++ b/vdirsyncer/storage/dav.py
@@ -7,8 +7,8 @@
     :license: MIT, see LICENSE for more details.
 '''
 
-from .base import Item
-from .http import HttpStorageBase
+from .base import Storage, Item
+from .http import prepare_auth, prepare_verify, USERAGENT
 import vdirsyncer.exceptions as exceptions
 import vdirsyncer.log as log
 import requests
@@ -23,7 +23,7 @@ CALDAV_DT_FORMAT = '%Y%m%dT%H%M%SZ'
 CONFIG_DT_FORMAT = '%Y-%m-%d'
 
 
-class DavStorage(HttpStorageBase):
+class DavStorage(Storage):
 
     # the file extension of items. Useful for testing against radicale.
     fileext = None
@@ -41,11 +41,40 @@ class DavStorage(HttpStorageBase):
     leif_class = None
 
     _session = None
-    _repr_attributes = ('url', 'username')
+    _repr_attributes = ('username', 'url')
+
+    def __init__(self, url, username='', password='', collection=None,
+                 verify=True, auth=None, useragent=USERAGENT, **kwargs):
+        '''
+        :param url: Base URL or an URL to a collection. Autodiscovery should be
+            done via :py:meth:`DavStorage.discover`.
+        :param username: Username for authentication.
+        :param password: Password for authentication.
+        :param verify: Verify SSL certificate, default True.
+        :param auth: Authentication method, from {'basic', 'digest'}, default
+            'basic'.
+        :param useragent: Default 'vdirsyncer'.
+        '''
 
-    def __init__(self, **kwargs):
         super(DavStorage, self).__init__(**kwargs)
 
+        if username and not password:
+            password = get_password(username, url)
+
+        self._settings = {
+            'verify': prepare_verify(verify),
+            'auth': prepare_auth(auth, username, password)
+        }
+        self.username, self.password = username, password
+        self.useragent = useragent
+
+        url = url.rstrip('/') + '/'
+        if collection is not None:
+            url = urlparse.urljoin(url, collection)
+        self.url = url.rstrip('/') + '/'
+        self.parsed_url = urlparse.urlparse(self.url)
+        self.collection = collection
+
         headers = self._default_headers()
         headers['Depth'] = 1
         response = self._request(
@@ -57,6 +86,12 @@ class DavStorage(HttpStorageBase):
         if self.dav_header not in response.headers.get('DAV', ''):
             raise exceptions.StorageError('URL is not a collection')
 
+    def _default_headers(self):
+        return {
+            'User-Agent': self.useragent,
+            'Content-Type': 'application/xml; charset=UTF-8'
+        }
+
     @classmethod
     def discover(cls, url, **kwargs):
         if kwargs.pop('collection', None) is not None:
diff --git a/vdirsyncer/storage/http.py b/vdirsyncer/storage/http.py
index af30a3e..b9e5852 100644
--- a/vdirsyncer/storage/http.py
+++ b/vdirsyncer/storage/http.py
@@ -14,6 +14,8 @@ import hashlib
 from .base import Storage, Item
 from vdirsyncer.utils import expand_path, get_password
 
+USERAGENT = 'vdirsyncer'
+
 
 def split_collection(text):
     item = []
@@ -63,11 +65,11 @@ def prepare_verify(verify):
     return verify
 
 
-class HttpStorageBase(Storage):
+class HttpStorage(Storage):
     _repr_attributes = ('username', 'url')
 
     def __init__(self, url, username='', password='', collection=None,
-                 verify=True, auth=None, useragent='vdirsyncer', **kwargs):
+                 verify=True, auth=None, useragent=USERAGENT, **kwargs):
         '''
         :param url: Base URL or an URL to a collection. Autodiscovery should be
             done via :py:meth:`DavStorage.discover`.
@@ -78,7 +80,7 @@ class HttpStorageBase(Storage):
             'basic'.
         :param useragent: Default 'vdirsyncer'.
         '''
-        super(HttpStorageBase, self).__init__(**kwargs)
+        super(HttpStorage, self).__init__(**kwargs)
 
         if username and not password:
             password = get_password(username, url)
@@ -90,27 +92,15 @@ class HttpStorageBase(Storage):
         self.username, self.password = username, password
         self.useragent = useragent
 
-        url = url.rstrip('/') + '/'
         if collection is not None:
             url = urlparse.urljoin(url, collection)
-        self.url = url.rstrip('/') + '/'
+        self.url = url
         self.parsed_url = urlparse.urlparse(self.url)
         self.collection = collection
+        self._items = {}
 
     def _default_headers(self):
-        return {
-            'User-Agent': self.useragent,
-            'Content-Type': 'application/xml; charset=UTF-8'
-        }
-
-
-class HttpStorage(HttpStorageBase):
-
-    _items = None
-
-    def __init__(self, **kwargs):
-        super(HttpStorage, self).__init__(**kwargs)
-        self._items = {}
+        return {'User-Agent': self.useragent}
 
     def list(self):
         r = requests.get(self.url, **self._settings)