fix html cache headers with i18n

packages/open-next/src/core/routing/util.ts

@@ -15,6 +15,7 @@ import type {
 
 import { debug, error } from "../../adapters/logger.js";
 import { isBinaryContentType } from "../../utils/binary.js";
+import { localizePath } from "./i18n/index.js";
 
 /**
  *
@@ -196,21 +197,22 @@ enum CommonHeaders {
  * @__PURE__
  */
 export function fixCacheHeaderForHtmlPages(
-  rawPath: string,
+  internalEvent: InternalEvent,
   headers: OutgoingHttpHeaders,
 ) {
   // We don't want to cache error pages
-  if (rawPath === "/404" || rawPath === "/500") {
+  if (internalEvent.rawPath === "/404" || internalEvent.rawPath === "/500") {
     if (process.env.OPEN_NEXT_DANGEROUSLY_SET_ERROR_HEADERS === "true") {
       return;
     }
     headers[CommonHeaders.CACHE_CONTROL] =
       "private, no-cache, no-store, max-age=0, must-revalidate";
     return;
   }
+  const localizedPath = localizePath(internalEvent);
   // WORKAROUND: `NextServer` does not set cache headers for HTML pages
   // https://opennext.js.org/aws/v2/advanced/workaround#workaround-nextserver-does-not-set-cache-headers-for-html-pages
-  if (HtmlPages.includes(rawPath)) {
+  if (HtmlPages.includes(localizedPath)) {
     headers[CommonHeaders.CACHE_CONTROL] =
       "public, max-age=0, s-maxage=31536000, must-revalidate";
   }
@@ -407,7 +409,7 @@ export function createServerResponse(
 ) {
   return new OpenNextNodeResponse(
     (_headers) => {
-      fixCacheHeaderForHtmlPages(internalEvent.rawPath, _headers);
+      fixCacheHeaderForHtmlPages(internalEvent, _headers);
       fixSWRCacheHeader(_headers);
       addOpenNextHeader(_headers);
       fixISRHeaders(_headers);

packages/tests-unit/tests/core/routing/util.test.ts

@@ -448,7 +448,12 @@ describe("fixCacheHeaderForHtmlPages", () => {
 
   it("should set cache-control header for /404 page", () => {
     const headers: Record<string, string> = {};
-    fixCacheHeaderForHtmlPages("/404", headers);
+    fixCacheHeaderForHtmlPages(
+      {
+        rawPath: "/404",
+      },
+      headers,
+    );
 
     expect(headers["cache-control"]).toBe(
       "private, no-cache, no-store, max-age=0, must-revalidate",
@@ -457,7 +462,12 @@ describe("fixCacheHeaderForHtmlPages", () => {
 
   it("should set cache-control header for /500 page", () => {
     const headers: Record<string, string> = {};
-    fixCacheHeaderForHtmlPages("/500", headers);
+    fixCacheHeaderForHtmlPages(
+      {
+        rawPath: "/500",
+      },
+      headers,
+    );
 
     expect(headers["cache-control"]).toBe(
       "private, no-cache, no-store, max-age=0, must-revalidate",
@@ -468,7 +478,12 @@ describe("fixCacheHeaderForHtmlPages", () => {
     const headers: Record<string, string> = {};
     config.HtmlPages.push("/my-html-page");
 
-    fixCacheHeaderForHtmlPages("/my-html-page", headers);
+    fixCacheHeaderForHtmlPages(
+      {
+        rawPath: "/my-html-page",
+      },
+      headers,
+    );
 
     expect(headers["cache-control"]).toBe(
       "public, max-age=0, s-maxage=31536000, must-revalidate",
@@ -482,6 +497,51 @@ describe("fixCacheHeaderForHtmlPages", () => {
 
     expect(headers).not.toHaveProperty("cache-control");
   });
+
+  it("should add cache-control header for html page with default i18n", () => {
+    const headers: Record<string, string> = {};
+    config.HtmlPages.push("/en/my-html-page");
+    config.NextConfig.i18n = {
+      defaultLocale: "en",
+      locales: ["en", "fr"],
+    };
+
+    fixCacheHeaderForHtmlPages(
+      {
+        rawPath: "/my-html-page",
+        cookies: {},
+        headers: {},
+      },
+      headers,
+    );
+
+    expect(headers["cache-control"]).toBe(
+      "public, max-age=0, s-maxage=31536000, must-revalidate",
+    );
+
+    config.NextConfig.i18n = undefined;
+  });
+
+  it("should add cache-control header for html page with locale", () => {
+    const headers: Record<string, string> = {};
+    config.HtmlPages.push("/en/my-html-page");
+    config.HtmlPages.push("/fr/my-html-page");
+
+    fixCacheHeaderForHtmlPages(
+      {
+        rawPath: "/en/my-html-page",
+        cookies: {},
+        headers: {
+          "accept-language": "fr",
+        },
+      },
+      headers,
+    );
+
+    expect(headers["cache-control"]).toBe(
+      "public, max-age=0, s-maxage=31536000, must-revalidate",
+    );
+  });
 });
 
 describe("fixSWRCacheHeader", () => {