Set Cache-Control: no-cache on every response

src/registrar/config/settings.py

@@ -136,6 +136,8 @@ MIDDLEWARE = [
     "allow_cidr.middleware.AllowCIDRMiddleware",
     # django-cors-headers: listen to cors responses
     "corsheaders.middleware.CorsMiddleware",
+    # custom middleware to stop caching from CloudFront
+    "registrar.no_cache_middleware.NoCacheMiddleware",
     # serve static assets in production
     "whitenoise.middleware.WhiteNoiseMiddleware",
     # provide security enhancements to the request/response cycle

src/registrar/no_cache_middleware.py

@@ -0,0 +1,17 @@
+"""Middleware to add Cache-control: no-cache to every response.
+
+Used to force Cloudfront caching to leave us alone while we develop
+better caching responses.
+"""
+
+class NoCacheMiddleware:
+
+    """Middleware to add a single header to every response."""
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+        response["Cache-Control"] = "no-cache"
+        return response