make keep alive True by default (#348)

Author: KazuCocoa

appium/webdriver/appium_connection.py

@@ -20,7 +20,7 @@
 class AppiumConnection(RemoteConnection):
 
     @classmethod
-    def get_remote_connection_headers(cls, parsed_url, keep_alive=False):
+    def get_remote_connection_headers(cls, parsed_url, keep_alive=True):
         """Override get_remote_connection_headers in RemoteConnection"""
         headers = RemoteConnection.get_remote_connection_headers(parsed_url, keep_alive=keep_alive)
         headers['User-Agent'] = 'appium/python {} ({})'.format(library_version(), headers['User-Agent'])

appium/webdriver/webdriver.py

@@ -122,7 +122,7 @@ class WebDriver(
 ):
 
     def __init__(self, command_executor='http://127.0.0.1:4444/wd/hub',
-                 desired_capabilities=None, browser_profile=None, proxy=None, keep_alive=False, direct_connection=False):
+                 desired_capabilities=None, browser_profile=None, proxy=None, keep_alive=True, direct_connection=False):
 
         super(WebDriver, self).__init__(
             AppiumConnection(command_executor, keep_alive=keep_alive),