Revert "Trust proxy headers for host provision callback"

This reverts commit 49e3971cd577127705fc0fd1d3b4ab7e3a3c3c2b.

awx/api/views/__init__.py

@@ -61,7 +61,6 @@ import pytz
 from wsgiref.util import FileWrapper
 
 # django-ansible-base
-from ansible_base.lib.utils.requests import get_remote_hosts
 from ansible_base.rbac.models import RoleEvaluation, ObjectRole
 from ansible_base.resource_registry.shared_types import OrganizationType, TeamType, UserType
 
@@ -2771,8 +2770,12 @@ class JobTemplateCallback(GenericAPIView):
         host for the current request.
         """
         # Find the list of remote host names/IPs to check.
-
-        remote_hosts = set(get_remote_hosts(self.request))
+        remote_hosts = set()
+        for header in settings.REMOTE_HOST_HEADERS:
+            for value in self.request.META.get(header, '').split(','):
+                value = value.strip()
+                if value:
+                    remote_hosts.add(value)
         # Add the reverse lookup of IP addresses.
         for rh in list(remote_hosts):
             try: