diff --git a/packages/astro/src/core/render/core.ts b/packages/astro/src/core/render/core.ts
index 69cdc341a3d08..86577450b53d5 100644
--- a/packages/astro/src/core/render/core.ts
+++ b/packages/astro/src/core/render/core.ts
@@ -1,5 +1,5 @@
 import type { APIContext, ComponentInstance, Params, Props, RouteData } from '../../@types/astro';
-import { renderPage as runtimeRenderPage } from '../../runtime/server/index.js';
+import { render, renderPage as runtimeRenderPage } from '../../runtime/server/index.js';
 import { attachToResponse } from '../cookies/index.js';
 import { AstroError, AstroErrorData } from '../errors/index.js';
 import type { LogOptions } from '../logger/core.js';
diff --git a/packages/astro/test/fixtures/ssr-locals/src/pages/api.js b/packages/astro/test/fixtures/ssr-locals/src/pages/api.js
index 8b209c5826c37..d4f7386fb85c4 100644
--- a/packages/astro/test/fixtures/ssr-locals/src/pages/api.js
+++ b/packages/astro/test/fixtures/ssr-locals/src/pages/api.js
@@ -1,5 +1,5 @@
 
-export async function post({ locals }) {
+export async function get({ locals }) {
 	let out = { ...locals };
 
 	return new Response(JSON.stringify(out), {
diff --git a/packages/astro/test/fixtures/ssr-locals/src/pages/foo.astro b/packages/astro/test/fixtures/ssr-locals/src/pages/foo.astro
index f864ac8f4690d..66b1f7a045b10 100644
--- a/packages/astro/test/fixtures/ssr-locals/src/pages/foo.astro
+++ b/packages/astro/test/fixtures/ssr-locals/src/pages/foo.astro
@@ -1,4 +1,4 @@
 ---
 const { foo } = Astro.locals;
 ---
-<h1>{ foo }</h1>
+<h1 id="foo">{ foo }</h1>
diff --git a/packages/astro/test/ssr-locals.test.js b/packages/astro/test/ssr-locals.test.js
index c0801cab70482..41e5710fbbb84 100644
--- a/packages/astro/test/ssr-locals.test.js
+++ b/packages/astro/test/ssr-locals.test.js
@@ -3,7 +3,7 @@ import * as cheerio from 'cheerio';
 import { loadFixture } from './test-utils.js';
 import testAdapter from './test-adapter.js';
 
-describe('SSR Environment Variables', () => {
+describe('SSR Astro.locals from server', () => {
 	/** @type {import('./test-utils').Fixture} */
 	let fixture;
 
@@ -19,20 +19,20 @@ describe('SSR Environment Variables', () => {
 	it('Can access Astro.locals in page', async () => {
 		const app = await fixture.loadTestAdapterApp();
 		const request = new Request('http://example.com/foo');
-		const route = match
-		const response = await app.render(request);
+		const locals = { foo: 'bar' };
+		const response = await app.render(request, undefined, locals);
 		const html = await response.text();
+
 		const $ = cheerio.load(html);
-		expect($('#ssr').text()).to.equal('true');
+		expect($('#foo').text()).to.equal('bar');
 	});
 
-	it('Can access Astro.locals in API', async () => {
+	it('Can access Astro.locals in api context', async () => {
 		const app = await fixture.loadTestAdapterApp();
 		const request = new Request('http://example.com/api');
-		const response = await app.render(request);
+		const locals = { foo: 'bar' };
+		const response = await app.render(request, undefined, locals);
 		expect(response.status).to.equal(200);
-		expect(response.headers.get('Content-Type')).to.equal('application/json;charset=utf-8');
-		expect(response.headers.get('Content-Length')).to.not.be.empty;
 		const body = await response.json();
 
 		expect(body.foo).to.equal('bar');
diff --git a/packages/astro/test/test-adapter.js b/packages/astro/test/test-adapter.js
index cc34e3c3373ce..d74cfaf81a71b 100644
--- a/packages/astro/test/test-adapter.js
+++ b/packages/astro/test/test-adapter.js
@@ -34,7 +34,7 @@ export default function ({ provideAddress = true, extendAdapter } = { provideAdd
 													this.#manifest = manifest;
 												}
 
-												async render(request, routeData) {
+												async render(request, routeData, locals) {
 													const url = new URL(request.url);
 													if(this.#manifest.assets.has(url.pathname)) {
 														const filePath = new URL('../client/' + this.removeBase(url.pathname), import.meta.url);
@@ -42,9 +42,8 @@ export default function ({ provideAddress = true, extendAdapter } = { provideAdd
 														return new Response(data);
 													}
 
-													Reflect.set(request, Symbol.for('astro.locals'), {});
 													${provideAddress ? `request[Symbol.for('astro.clientAddress')] = '0.0.0.0';` : ''}
-													return super.render(request, routeData);
+													return super.render(request, routeData, locals);
 												}
 											}