httptest-cache: Enable passing port and address to bind to

httptest/cli.py

@@ -17,10 +17,19 @@ def cache():
                         help='Directory to cache requests in',
                         default=os.path.join(os.path.expanduser('~'),
                                              '.cache', 'httptest'))
+    parser.add_argument(
+        "--addr", help="Address to bind to (default 127.0.0.1)", default="127.0.0.1"
+    )
+    parser.add_argument(
+        "--port", help="Port to bind to (default random)", type=int, default=0
+    )
 
     args = parser.parse_args()
 
-    @Server(CachingProxyHandler.to(args.upstream, state_dir=args.state_dir))
+    @Server(
+        CachingProxyHandler.to(args.upstream, state_dir=args.state_dir),
+        addr=(args.addr, args.port),
+    )
     def waiter(ts):
         print('Serving on http://%s:%d' % (ts.server_name, ts.server_port,))
         while True: