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-rw-r--r--django/http/request.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/http/request.py b/django/http/request.py
index 933af0f13e..5c567b9c46 100644
--- a/django/http/request.py
+++ b/django/http/request.py
@@ -108,7 +108,7 @@ class HttpRequest:
# Allow variants of localhost if ALLOWED_HOSTS is empty and DEBUG=True.
allowed_hosts = settings.ALLOWED_HOSTS
if settings.DEBUG and not allowed_hosts:
- allowed_hosts = ['localhost', '127.0.0.1', '[::1]']
+ allowed_hosts = ['.localhost', '127.0.0.1', '[::1]']
domain, port = split_domain_port(host)
if domain and validate_host(domain, allowed_hosts):