multitenant: always return 200 on fake health.check tenant (#34773)

hobo/multitenant/middleware.py

@@ -5,7 +5,7 @@ import hashlib
 from django.utils.encoding import smart_bytes
 from django.conf import settings
 from django.db import connection
-from django.http import Http404, HttpResponseRedirect
+from django.http import Http404, HttpResponse, HttpResponseRedirect
 from django.contrib.contenttypes.models import ContentType
 from tenant_schemas.utils import get_tenant_model, get_public_schema_name
 
@@ -62,6 +62,11 @@ class TenantMiddleware(object):
         connection.set_schema_to_public()
         hostname_without_port = request.get_host().split(':')[0]
 
+        if hostname_without_port == 'health.check':
+            # allow for special health.check domain name for haproxy
+            # availability checks.
+            return HttpResponse('health ok', content_type='text/plain')
+
         try:
             request.tenant = self.get_tenant_by_hostname(hostname_without_port)
         except TenantNotFound: