Update experimental compile cache handling (#56139)

This ensures we properly set a cache-control header for automatically statically optimized pages so we aren't re-re-rendering every time for them when leveraging this mode.

packages/next/src/build/index.ts

@@ -920,6 +920,8 @@ export default async function build(
               incrementalCacheHandlerPath: incrementalCacheHandlerPath
                 ? path.relative(distDir, incrementalCacheHandlerPath)
                 : undefined,
+
+              isExperimentalCompile: true,
             },
           },
           appDir: dir,

packages/next/src/server/base-server.ts

@@ -286,6 +286,7 @@ export default abstract class Server<ServerOptions extends Options = Options> {
     largePageDataBytes?: number
     appDirDevErrorLogger?: (err: any) => Promise<void>
     strictNextHead: boolean
+    isExperimentalCompile?: boolean
   }
   protected readonly serverOptions: Readonly<ServerOptions>
   protected readonly appPathRoutes?: Record<string, string[]>
@@ -477,6 +478,9 @@ export default abstract class Server<ServerOptions extends Options = Options> {
         Object.keys(publicRuntimeConfig).length > 0
           ? publicRuntimeConfig
           : undefined,
+
+      // @ts-expect-error internal field not publicly exposed
+      isExperimentalCompile: this.nextConfig.experimental.isExperimentalCompile,
     }
 
     // Initialize next/config with the environment configuration

packages/next/src/server/render.tsx

@@ -47,6 +47,7 @@ import {
   SERVER_PROPS_SSG_CONFLICT,
   SSG_GET_INITIAL_PROPS_CONFLICT,
   UNSTABLE_REVALIDATE_RENAME_ERROR,
+  CACHE_ONE_YEAR,
 } from '../lib/constants'
 import {
   COMPILER_NAMES,
@@ -101,6 +102,7 @@ import {
 import { getTracer } from './lib/trace/tracer'
 import { RenderSpan } from './lib/trace/constants'
 import { ReflectAdapter } from './web/spec-extension/adapters/reflect'
+import { setRevalidateHeaders } from './send-payload'
 
 let tryGetPreviewData: typeof import('./api-utils/node/try-get-preview-data').tryGetPreviewData
 let warn: typeof import('../build/output/log').warn
@@ -280,6 +282,7 @@ export type RenderOptsPartial = {
   isDraftMode?: boolean
   deploymentId?: string
   isServerAction?: boolean
+  isExperimentalCompile?: boolean
 }
 
 export type RenderOpts = LoadComponentsReturnType & RenderOptsPartial
@@ -441,6 +444,7 @@ export async function renderToHTMLImpl(
     basePath,
     images,
     runtime: globalRuntime,
+    isExperimentalCompile,
   } = renderOpts
   const { App } = extra
 
@@ -497,6 +501,18 @@ export async function renderToHTMLImpl(
     !isSSG &&
     !getServerSideProps
 
+  // if we are running from experimental compile and the page
+  // would normally be automatically statically optimized
+  // ensure we set cache header so it's not rendered on-demand
+  // every request
+  if (isAutoExport && !dev && isExperimentalCompile) {
+    setRevalidateHeaders(res, {
+      revalidate: CACHE_ONE_YEAR,
+      private: false,
+      stateful: false,
+    })
+  }
+
   if (hasPageGetInitialProps && isSSG) {
     throw new Error(SSG_GET_INITIAL_PROPS_CONFLICT + ` ${pathname}`)
   }