Do not send "Connection: close" when requesting a tunnel. Fixes #32750 (#46070)

changelogs/fragments/urls-proxy-validate.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- 'urls - When validating SSL certs using an a non-SSL proxy, do not send "Connection: close" when requesting a tunnel. This prevents some proxy servers from dropping the connection (https://github.com/ansible/ansible/issues/32750)'

lib/ansible/module_utils/urls.py

@@ -663,7 +663,7 @@ class SSLValidationHandler(urllib_request.BaseHandler):
     http://stackoverflow.com/questions/1087227/validate-ssl-certificates-with-python
     http://techknack.net/python-urllib2-handlers/
     '''
-    CONNECT_COMMAND = "CONNECT %s:%s HTTP/1.0\r\nConnection: close\r\n"
+    CONNECT_COMMAND = "CONNECT %s:%s HTTP/1.0\r\n"
 
     def __init__(self, hostname, port):
         self.hostname = hostname