From ff18b9c18558dcfdae581cc1c603a9a53491c7c2 Mon Sep 17 00:00:00 2001
From: Emanuele Stoppa <my.burning@gmail.com>
Date: Thu, 5 Dec 2024 12:25:01 +0000
Subject: [PATCH] chore: better warning (#12642)

* chore: better warning

* Apply suggestions from code review

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

---------

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>
---
 .changeset/fuzzy-pans-cough.md                       | 5 +++++
 packages/astro/src/core/build/generate.ts            | 1 +
 packages/astro/src/core/request.ts                   | 5 ++++-
 packages/astro/src/vite-plugin-astro-server/route.ts | 1 +
 4 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/fuzzy-pans-cough.md

diff --git a/.changeset/fuzzy-pans-cough.md b/.changeset/fuzzy-pans-cough.md
new file mode 100644
index 0000000000..f813b1c356
--- /dev/null
+++ b/.changeset/fuzzy-pans-cough.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Provides more information when logging a warning for accessing `Astro.request.headers` in prerendered pages
diff --git a/packages/astro/src/core/build/generate.ts b/packages/astro/src/core/build/generate.ts
index 1cc25aaee7..84d344bfbb 100644
--- a/packages/astro/src/core/build/generate.ts
+++ b/packages/astro/src/core/build/generate.ts
@@ -437,6 +437,7 @@ async function generatePath(
 		headers: new Headers(),
 		logger,
 		isPrerendered: true,
+		routePattern: route.component
 	});
 	const renderContext = await RenderContext.create({
 		pipeline,
diff --git a/packages/astro/src/core/request.ts b/packages/astro/src/core/request.ts
index 624bee8798..98d4402c6d 100644
--- a/packages/astro/src/core/request.ts
+++ b/packages/astro/src/core/request.ts
@@ -20,6 +20,8 @@ export interface CreateRequestOptions {
 	 * @default false
 	 */
 	isPrerendered?: boolean;
+
+	routePattern: string
 }
 
 const clientAddressSymbol = Symbol.for('astro.clientAddress');
@@ -41,6 +43,7 @@ export function createRequest({
 	logger,
 	locals,
 	isPrerendered = false,
+	routePattern
 }: CreateRequestOptions): Request {
 	// headers are made available on the created request only if the request is for a page that will be on-demand rendered
 	const headersObj = isPrerendered
@@ -82,7 +85,7 @@ export function createRequest({
 			get() {
 				logger.warn(
 					null,
-					`\`Astro.request.headers\` is not available on prerendered pages. If you need access to request headers, make sure that the page is server rendered using \`export const prerender = false;\` or by setting \`output\` to \`"server"\` in your Astro config to make all your pages server rendered.`,
+					`\`Astro.request.headers\` was used when rendering the route \`${routePattern}'\`. \`Astro.request.headers\` is not available on prerendered pages. If you need access to request headers, make sure that the page is server-rendered using \`export const prerender = false;\` or by setting \`output\` to \`"server"\` in your Astro config to make all your pages server-rendered by default.`,
 				);
 				return _headers;
 			},
diff --git a/packages/astro/src/vite-plugin-astro-server/route.ts b/packages/astro/src/vite-plugin-astro-server/route.ts
index b4158b854d..978de421a8 100644
--- a/packages/astro/src/vite-plugin-astro-server/route.ts
+++ b/packages/astro/src/vite-plugin-astro-server/route.ts
@@ -174,6 +174,7 @@ export async function handleRoute({
 		logger,
 		clientAddress: incomingRequest.socket.remoteAddress,
 		isPrerendered: route.prerender,
+		routePattern: route.component
 	});
 
 	// Set user specified headers to response object.