diff --git a/daphne/cli.py b/daphne/cli.py
index 1c51940..53e9053 100755
--- a/daphne/cli.py
+++ b/daphne/cli.py
@@ -12,6 +12,7 @@ logger = logging.getLogger(__name__)
 DEFAULT_HOST = "127.0.0.1"
 DEFAULT_PORT = 8000
 
+
 class CommandLineInterface(object):
     """
     Acts as the main CLI entry point for running the server.
diff --git a/daphne/endpoints.py b/daphne/endpoints.py
index aae44fe..3ac837d 100644
--- a/daphne/endpoints.py
+++ b/daphne/endpoints.py
@@ -1,9 +1,11 @@
+
+
 def build_endpoint_description_strings(
     host=None,
     port=None,
     unix_socket=None,
     file_descriptor=None
-    ):
+):
     """
     Build a list of twisted endpoint description strings that the server will listen on.
     This is to streamline the generation of twisted endpoint description strings from easier
diff --git a/daphne/http_protocol.py b/daphne/http_protocol.py
index 078cfea..7a1a7fc 100755
--- a/daphne/http_protocol.py
+++ b/daphne/http_protocol.py
@@ -1,20 +1,16 @@
 import logging
-import random
-import string
 import time
 import traceback
 
 import six
-from twisted.internet.defer import ensureDeferred
 from twisted.internet.interfaces import IProtocolNegotiationFactory
 from twisted.protocols.policies import ProtocolWrapper
 from twisted.web import http
 from zope.interface import implementer
 
-from six.moves.urllib_parse import unquote, unquote_plus
+from six.moves.urllib_parse import unquote
 
 from .utils import parse_x_forwarded_for
-from .ws_protocol import WebSocketFactory, WebSocketProtocol
 
 logger = logging.getLogger(__name__)
 
@@ -138,7 +134,7 @@ class WebRequest(http.Request):
                         continue
                     for value in values:
                         if name.lower() == b"daphne-root-path":
-                            self.root_path = self.unquote(value)
+                            self.root_path = unquote(value.decode("ascii"))
                         else:
                             self.clean_headers.append((name.lower(), value))
                 logger.debug("HTTP %s request for %s", self.method, self.client_addr)
@@ -149,7 +145,7 @@ class WebRequest(http.Request):
                     # TODO: Correctly say if it's 1.1 or 1.0
                     "http_version": self.clientproto.split(b"/")[-1].decode("ascii"),
                     "method": self.method.decode("ascii"),
-                    "path": self.unquote(self.path),
+                    "path": unquote(self.path.decode("ascii")),
                     "root_path": self.root_path,
                     "scheme": "https" if self.isSecure() else "http",
                     "query_string": self.query_string,
@@ -213,9 +209,9 @@ class WebRequest(http.Request):
             logger.debug("HTTP %s response started for %s", message["status"], self.client_addr)
         elif message["type"] == "http.response.content":
             if not self._response_started:
-                raise ValueError("HTTP response has not yet been started but got %s" % message["type"])# Write out body
+                raise ValueError("HTTP response has not yet been started but got %s" % message["type"])
+            # Write out body
             http.Request.write(self, message.get("content", b""))
-
             # End if there's no more content
             if not message.get("more_content", False):
                 self.finish()
@@ -252,22 +248,6 @@ class WebRequest(http.Request):
 
     ### Utility functions
 
-    @classmethod
-    def unquote(cls, value, plus_as_space=False):
-        """
-        Python 2 and 3 compat layer for utf-8 unquoting
-        """
-        if six.PY2:
-            if plus_as_space:
-                return unquote_plus(value).decode("utf8")
-            else:
-                return unquote(value).decode("utf8")
-        else:
-            if plus_as_space:
-                return unquote_plus(value.decode("ascii"))
-            else:
-                return unquote(value.decode("ascii"))
-
     def send_disconnect(self):
         """
         Sends a http.disconnect message.
diff --git a/daphne/server.py b/daphne/server.py
index 7f443c7..22629c6 100755
--- a/daphne/server.py
+++ b/daphne/server.py
@@ -3,12 +3,8 @@ from twisted.internet import asyncioreactor  # isort:skip
 asyncioreactor.install()  # isort:skip
 
 import asyncio
-import collections
 import logging
-import random
-import string
 import traceback
-import warnings
 
 from twisted.internet import defer, reactor
 from twisted.internet.endpoints import serverFromString
diff --git a/daphne/utils.py b/daphne/utils.py
index 450416e..b6f0fbb 100644
--- a/daphne/utils.py
+++ b/daphne/utils.py
@@ -1,5 +1,4 @@
 import importlib
-import sys
 
 from twisted.web.http_headers import Headers
 
diff --git a/daphne/ws_protocol.py b/daphne/ws_protocol.py
index 1de218c..9dfa339 100755
--- a/daphne/ws_protocol.py
+++ b/daphne/ws_protocol.py
@@ -6,7 +6,7 @@ import six
 from autobahn.twisted.websocket import ConnectionDeny, WebSocketServerFactory, WebSocketServerProtocol
 from twisted.internet import defer
 
-from six.moves.urllib_parse import unquote, urlencode
+from six.moves.urllib_parse import unquote
 
 from .utils import parse_x_forwarded_for
 
@@ -61,19 +61,23 @@ class WebSocketProtocol(WebSocketServerProtocol):
             subprotocols = []
             for header, value in self.clean_headers:
                 if header == b"sec-websocket-protocol":
-                    subprotocols = [x.strip() for x in self.unquote(value).split(",")]
+                    subprotocols = [
+                        x.strip()
+                        for x in
+                        unquote(value.decode("ascii")).split(",")
+                    ]
             # Make new application instance with scope
             self.path = request.path.encode("ascii")
             self.application_queue = self.server.create_application(self, {
                 "type": "websocket",
-                "path": self.unquote(self.path),
+                "path": unquote(self.path.decode("ascii")),
                 "headers": self.clean_headers,
                 "query_string": self._raw_query_string,  # Passed by HTTP protocol
                 "client": self.client_addr,
                 "server": self.server_addr,
                 "subprotocols": subprotocols,
             })
-        except:
+        except Exception as e:
             # Exceptions here are not displayed right, just 500.
             # Turn them into an ERROR log.
             logger.error(traceback.format_exc())
@@ -152,7 +156,7 @@ class WebSocketProtocol(WebSocketServerProtocol):
             if message.get("bytes", None) and message.get("text", None):
                 raise ValueError(
                     "Got invalid WebSocket reply message on %s - contains both bytes and text keys" % (
-                        channel,
+                        message,
                     )
                 )
             if message.get("bytes", None):
@@ -214,16 +218,6 @@ class WebSocketProtocol(WebSocketServerProtocol):
 
     ### Utils
 
-    @classmethod
-    def unquote(cls, value):
-        """
-        Python 2 and 3 compat layer for utf-8 unquoting
-        """
-        if six.PY2:
-            return unquote(value).decode("utf8")
-        else:
-            return unquote(value.decode("ascii"))
-
     def duration(self):
         """
         Returns the time since the socket was opened
diff --git a/setup.cfg b/setup.cfg
index 34d6b8a..eefdf95 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -10,5 +10,5 @@ multi_line_output = 3
 
 [flake8]
 exclude = venv/*,tox/*,docs/*,testproject/*,js_client/*
-ignore = E123,E128,E402,W503,E731,W601
+ignore = E123,E128,E266,E402,W503,E731,W601
 max-line-length = 120
diff --git a/tests/test_http_request.py b/tests/test_http_request.py
index 924519c..61be621 100644
--- a/tests/test_http_request.py
+++ b/tests/test_http_request.py
@@ -15,14 +15,14 @@ class TestHTTPRequest(DaphneTestCase):
     """
 
     def assert_valid_http_scope(
-            self,
-            scope,
-            method,
-            path,
-            params=None,
-            headers=None,
-            scheme=None,
-        ):
+        self,
+        scope,
+        method,
+        path,
+        params=None,
+        headers=None,
+        scheme=None,
+    ):
         """
         Checks that the passed scope is a valid ASGI HTTP scope regarding types
         and some urlencoding things.
@@ -76,11 +76,7 @@ class TestHTTPRequest(DaphneTestCase):
         if server is not None:
             self.assert_valid_address_and_port(server)
 
-    def assert_valid_http_request_message(
-            self,
-            message,
-            body=None,
-        ):
+    def assert_valid_http_request_message(self, message, body=None):
         """
         Asserts that a message is a valid http.request message
         """
@@ -167,13 +163,13 @@ class TestHTTPRequest(DaphneTestCase):
     )
     @settings(max_examples=5, deadline=2000)
     def test_kitchen_sink(
-            self,
-            request_method,
-            request_path,
-            request_params,
-            request_headers,
-            request_body,
-        ):
+        self,
+        request_method,
+        request_path,
+        request_params,
+        request_headers,
+        request_body,
+    ):
         """
         Throw everything at Daphne that we dare. The idea is that if a combination
         of method/path/headers/body would break the spec, hypothesis will eventually find it.
diff --git a/tests/test_websocket.py b/tests/test_websocket.py
index 16c7374..977d6ec 100644
--- a/tests/test_websocket.py
+++ b/tests/test_websocket.py
@@ -15,14 +15,14 @@ class TestWebsocket(DaphneTestCase):
     """
 
     def assert_valid_websocket_scope(
-            self,
-            scope,
-            path="/",
-            params=None,
-            headers=None,
-            scheme=None,
-            subprotocols=None,
-        ):
+        self,
+        scope,
+        path="/",
+        params=None,
+        headers=None,
+        scheme=None,
+        subprotocols=None,
+    ):
         """
         Checks that the passed scope is a valid ASGI HTTP scope regarding types
         and some urlencoding things.
@@ -145,11 +145,11 @@ class TestWebsocket(DaphneTestCase):
     )
     @settings(max_examples=5, deadline=2000)
     def test_http_bits(
-            self,
-            request_path,
-            request_params,
-            request_headers,
-        ):
+        self,
+        request_path,
+        request_params,
+        request_headers,
+    ):
         """
         Tests that various HTTP-level bits (query string params, path, headers)
         carry over into the scope.