Revert "Don't influence Cache-Control through CACHE_AUTO_PURGE" (#22235)

* Revert "Don't influence Cache-Control through `CACHE_AUTO_PURGE` (#22203)"

This reverts commit 12fb7719fe.

* Add changeset

.changeset/breezy-crabs-yell.md

@@ -0,0 +1,5 @@
+---
+'@directus/api': patch
+---
+
+Reverted cache-control header change to prevent cache inconsistencies in-app

api/src/utils/get-cache-headers.test.ts

@@ -69,6 +69,50 @@ const scenarios = [
 		output: 'max-age=0',
 	},
 
+	// Test CACHE_AUTO_PURGE env for no-cache
+	{
+		name: 'when CACHE_AUTO_PURGE is true and globalCacheSettings is true',
+		input: {
+			env: {
+				CACHE_AUTO_PURGE: true,
+			},
+			headers: {},
+			accountability: null,
+			ttl: 5678910,
+			globalCacheSettings: true,
+			personalized: false,
+		},
+		output: 'no-cache',
+	},
+	{
+		name: 'when CACHE_AUTO_PURGE is true and globalCacheSettings is false',
+		input: {
+			env: {
+				CACHE_AUTO_PURGE: true,
+			},
+			headers: {},
+			accountability: null,
+			ttl: 5678910,
+			globalCacheSettings: false,
+			personalized: false,
+		},
+		output: 'max-age=5679',
+	},
+	{
+		name: 'when CACHE_AUTO_PURGE is false and globalCacheSettings is true',
+		input: {
+			env: {
+				CACHE_AUTO_PURGE: false,
+			},
+			headers: {},
+			accountability: null,
+			ttl: 5678910,
+			globalCacheSettings: true,
+			personalized: false,
+		},
+		output: 'max-age=5679',
+	},
+
 	// Test personalized
 	{
 		name: 'when personalized is true and accountability is null',

api/src/utils/get-cache-headers.ts

@@ -24,6 +24,9 @@ export function getCacheControlHeader(
 	// When the resource / current request shouldn't be cached
 	if (ttl === undefined || ttl < 0) return 'no-cache';
 
+	// When the API cache can invalidate at any moment
+	if (globalCacheSettings && env['CACHE_AUTO_PURGE'] === true) return 'no-cache';
+
 	const headerValues = [];
 
 	// When caching depends on the authentication status of the users