Having a : or @ in a route does not work

aiohttp/web_urldispatcher.py

@@ -11,7 +11,10 @@
 from pathlib import Path
 from types import MappingProxyType
 
-from yarl import URL, quote, unquote
+# do not use yarl.quote directly,
+# use `URL(path).raw_path` instead of `quote(path)`
+# Escaping of the URLs need to be consitent with the escaping done by yarl
+from yarl import URL, unquote
 
 from . import hdrs
 from .abc import AbstractMatchInfo, AbstractRouter, AbstractView
@@ -373,7 +376,7 @@ def __init__(self, prefix, *, name=None):
         assert not prefix or prefix.startswith('/'), prefix
         assert prefix in ('', '/') or not prefix.endswith('/'), prefix
         super().__init__(name=name)
-        self._prefix = quote(prefix, safe='/')
+        self._prefix = URL(prefix).raw_path
 
     def add_prefix(self, prefix):
         assert prefix.startswith('/')
@@ -421,7 +424,7 @@ def url_for(self, *, filename):
         while filename.startswith('/'):
             filename = filename[1:]
         filename = '/' + filename
-        url = self._prefix + quote(filename, safe='/')
+        url = self._prefix + URL(filename).raw_path
         return URL(url)
 
     def get_info(self):
@@ -783,7 +786,8 @@ def add_resource(self, path, *, name=None):
         if path and not path.startswith('/'):
             raise ValueError("path should be started with / or be empty")
         if not ('{' in path or '}' in path or self.ROUTE_RE.search(path)):
-            resource = PlainResource(quote(path, safe='/'), name=name)
+            url = URL(path)
+            resource = PlainResource(url.raw_path, name=name)
             self.register_resource(resource)
             return resource
 
@@ -805,9 +809,9 @@ def add_resource(self, path, *, name=None):
             if '{' in part or '}' in part:
                 raise ValueError("Invalid path '{}'['{}']".format(path, part))
 
-            part = quote(part, safe='/')
-            formatter += part
-            pattern += re.escape(part)
+            path = URL(part).raw_path
+            formatter += path
+            pattern += re.escape(path)
 
         try:
             compiled = re.compile(pattern)

tests/test_web_urldispatcher.py

@@ -158,6 +158,28 @@ def test_access_non_existing_resource(tmp_dir_path, loop, test_client):
     yield from r.release()
 
 
+@pytest.mark.parametrize('registered_path,request_url', [
+    ('/a:b', '/a:b'),
+    ('/a@b', '/a@b'),
+    ('/a:b', '/a%3Ab'),
+])
+@asyncio.coroutine
+def test_url_escaping(loop, test_client, registered_path, request_url):
+    """
+    Tests accessing a resource with
+    """
+    app = web.Application(loop=loop)
+
+    def handler(_):
+        return web.Response()
+    app.router.add_get(registered_path, handler)
+    client = yield from test_client(app)
+
+    r = yield from client.get(request_url)
+    assert r.status == 200
+    yield from r.release()
+
+
 @asyncio.coroutine
 def test_unauthorized_folder_access(tmp_dir_path, loop, test_client):
     """