+
+def _build_proxy_handler(name):
+    class HTTPTestRequestHandler(compat_http_server.BaseHTTPRequestHandler):
+        proxy_name = name
+
+        def log_message(self, format, *args):
+            pass
+
+        def do_GET(self):
+            self.send_response(200)
+            self.send_header('Content-Type', 'text/plain; charset=utf-8')
+            self.end_headers()
+            self.wfile.write('{self.proxy_name}: {self.path}'.format(self=self).encode('utf-8'))
+    return HTTPTestRequestHandler
+
+
+class TestProxy(unittest.TestCase):
+    def setUp(self):
+        self.proxy = compat_http_server.HTTPServer(
+            ('localhost', 0), _build_proxy_handler('normal'))
+        self.port = http_server_port(self.proxy)
+        self.proxy_thread = threading.Thread(target=self.proxy.serve_forever)
+        self.proxy_thread.daemon = True
+        self.proxy_thread.start()
+
+        self.geo_proxy = compat_http_server.HTTPServer(
+            ('localhost', 0), _build_proxy_handler('geo'))
+        self.geo_port = http_server_port(self.geo_proxy)
+        self.geo_proxy_thread = threading.Thread(target=self.geo_proxy.serve_forever)
+        self.geo_proxy_thread.daemon = True
+        self.geo_proxy_thread.start()
+
+    def test_proxy(self):
+        geo_proxy = 'localhost:{0}'.format(self.geo_port)
+        ydl = YoutubeDL({
+            'proxy': 'localhost:{0}'.format(self.port),
+            'geo_verification_proxy': geo_proxy,
+        })
+        url = 'http://foo.com/bar'
+        response = ydl.urlopen(url).read().decode('utf-8')
+        self.assertEqual(response, 'normal: {0}'.format(url))
+
+        req = compat_urllib_request.Request(url)
+        req.add_header('Ytdl-request-proxy', geo_proxy)
+        response = ydl.urlopen(req).read().decode('utf-8')
+        self.assertEqual(response, 'geo: {0}'.format(url))
+
+    def test_proxy_with_idn(self):
+        ydl = YoutubeDL({
+            'proxy': 'localhost:{0}'.format(self.port),
+        })
+        url = 'http://中文.tw/'
+        response = ydl.urlopen(url).read().decode('utf-8')
+        # b'xn--fiq228c' is '中文'.encode('idna')
+        self.assertEqual(response, 'normal: http://xn--fiq228c.tw/')
+