diff --git a/packages/astro/src/core/app/index.ts b/packages/astro/src/core/app/index.ts
index c3b687d01..40bd123d5 100644
--- a/packages/astro/src/core/app/index.ts
+++ b/packages/astro/src/core/app/index.ts
@@ -107,6 +107,7 @@ export class App {
 			},
 			routeCache: new RouteCache(this.#logging),
 			site: this.#manifest.site,
+			base: this.#manifest.base,
 			ssr: true,
 			streaming,
 		});
diff --git a/packages/astro/src/core/build/generate.ts b/packages/astro/src/core/build/generate.ts
index f8d1bf6b4..102f1ff1c 100644
--- a/packages/astro/src/core/build/generate.ts
+++ b/packages/astro/src/core/build/generate.ts
@@ -526,6 +526,7 @@ async function generatePath(
 		},
 		routeCache,
 		site: manifest.site,
+		base: manifest.base,
 		ssr,
 		streaming: true,
 	});
diff --git a/packages/astro/src/core/endpoint/index.ts b/packages/astro/src/core/endpoint/index.ts
index 9298e7cbe..d450cc48a 100644
--- a/packages/astro/src/core/endpoint/index.ts
+++ b/packages/astro/src/core/endpoint/index.ts
@@ -13,6 +13,7 @@ import { AstroCookies, attachCookiesToResponse } from '../cookies/index.js';
 import { AstroError, AstroErrorData } from '../errors/index.js';
 import { warn } from '../logger/core.js';
 import { callMiddleware } from '../middleware/callMiddleware.js';
+import { createRouteUrl } from '../routing/url.js';
 
 const clientAddressSymbol = Symbol.for('astro.clientAddress');
 const clientLocalsSymbol = Symbol.for('astro.locals');
@@ -31,6 +32,7 @@ type CreateAPIContext = {
 	request: Request;
 	params: Params;
 	site?: string;
+	routeUrl: URL;
 	props: Record<string, any>;
 	adapterName?: string;
 };
@@ -44,6 +46,7 @@ export function createAPIContext({
 	request,
 	params,
 	site,
+	routeUrl,
 	props,
 	adapterName,
 }: CreateAPIContext): APIContext {
@@ -62,7 +65,7 @@ export function createAPIContext({
 				},
 			});
 		},
-		url: new URL(request.url),
+		url: routeUrl,
 		get clientAddress() {
 			if (!(clientAddressSymbol in request)) {
 				if (adapterName) {
@@ -102,11 +105,18 @@ export async function callEndpoint<MiddlewareResult = Response | EndpointOutput>
 	ctx: RenderContext,
 	onRequest?: MiddlewareHandler<MiddlewareResult> | undefined
 ): Promise<EndpointCallResult> {
+	const routeUrl = createRouteUrl(ctx.route, {
+		params: ctx.params,
+		base: env.base,
+		site: env.site ?? new URL(ctx.request.url).origin,
+	});
+
 	const context = createAPIContext({
 		request: ctx.request,
 		params: ctx.params,
 		props: ctx.props,
 		site: env.site,
+		routeUrl,
 		adapterName: env.adapterName,
 	});
 
diff --git a/packages/astro/src/core/middleware/index.ts b/packages/astro/src/core/middleware/index.ts
index 90c5bdb5e..467c4b5e1 100644
--- a/packages/astro/src/core/middleware/index.ts
+++ b/packages/astro/src/core/middleware/index.ts
@@ -29,6 +29,7 @@ function createContext({ request, params }: CreateContext) {
 		params: params ?? {},
 		props: {},
 		site: undefined,
+		routeUrl: new URL(request.url)
 	});
 }
 
diff --git a/packages/astro/src/core/pipeline.ts b/packages/astro/src/core/pipeline.ts
index 66fa6bd07..a1a7a58c7 100644
--- a/packages/astro/src/core/pipeline.ts
+++ b/packages/astro/src/core/pipeline.ts
@@ -10,6 +10,7 @@ import type {
 } from '../@types/astro';
 import { callMiddleware } from './middleware/callMiddleware.js';
 import { renderPage } from './render/core.js';
+import { createRouteUrl } from './routing/url.js';
 
 type EndpointResultHandler = (
 	originalRequest: Request,
@@ -95,11 +96,18 @@ export class Pipeline {
 		mod: Readonly<ComponentInstance>,
 		onRequest?: MiddlewareHandler<MiddlewareReturnType>
 	): Promise<Response | EndpointCallResult> {
+		const routeUrl = createRouteUrl(renderContext.route, {
+			params: renderContext.params,
+			base: env.base,
+			site: env.site ?? new URL(renderContext.request.url).origin,
+		});
+		
 		const apiContext = createAPIContext({
 			request: renderContext.request,
 			params: renderContext.params,
 			props: renderContext.props,
 			site: env.site,
+			routeUrl,
 			adapterName: env.adapterName,
 		});
 
diff --git a/packages/astro/src/core/render/core.ts b/packages/astro/src/core/render/core.ts
index 9de046278..44d6c28b8 100644
--- a/packages/astro/src/core/render/core.ts
+++ b/packages/astro/src/core/render/core.ts
@@ -11,6 +11,7 @@ import { attachCookiesToResponse } from '../cookies/index.js';
 import { callEndpoint, createAPIContext, type EndpointCallResult } from '../endpoint/index.js';
 import { callMiddleware } from '../middleware/callMiddleware.js';
 import { redirectRouteGenerate, redirectRouteStatus, routeIsRedirect } from '../redirects/index.js';
+import { createRouteUrl } from '../routing/url.js';
 import type { RenderContext } from './context.js';
 import type { Environment } from './environment.js';
 import { createResult } from './result.js';
@@ -37,11 +38,18 @@ export async function renderPage({ mod, renderContext, env, cookies }: RenderPag
 	if (!Component)
 		throw new Error(`Expected an exported Astro component but received typeof ${typeof Component}`);
 
+	const routeUrl = createRouteUrl(renderContext.route, {
+		params: renderContext.params,
+		base: env.base,
+		site: env.site ?? new URL(renderContext.request.url).origin,
+	});
+
 	const result = createResult({
 		adapterName: env.adapterName,
 		links: renderContext.links,
 		styles: renderContext.styles,
 		logging: env.logging,
+		routeUrl,
 		params: renderContext.params,
 		pathname: renderContext.pathname,
 		componentMetadata: renderContext.componentMetadata,
@@ -93,11 +101,18 @@ export async function tryRenderRoute<MiddlewareReturnType = Response>(
 	mod: Readonly<ComponentInstance>,
 	onRequest?: MiddlewareHandler<MiddlewareReturnType>
 ): Promise<Response | EndpointCallResult> {
+	const routeUrl = createRouteUrl(renderContext.route, {
+		params: renderContext.params,
+		base: env.base,
+		site: env.site ?? new URL(renderContext.request.url).origin,
+	});
+
 	const apiContext = createAPIContext({
 		request: renderContext.request,
 		params: renderContext.params,
 		props: renderContext.props,
 		site: env.site,
+		routeUrl,
 		adapterName: env.adapterName,
 	});
 
diff --git a/packages/astro/src/core/render/environment.ts b/packages/astro/src/core/render/environment.ts
index 32dfb454b..3b65e7ea7 100644
--- a/packages/astro/src/core/render/environment.ts
+++ b/packages/astro/src/core/render/environment.ts
@@ -26,6 +26,10 @@ export interface Environment {
 	 * Used for `Astro.site`
 	 */
 	site?: string;
+	/**
+	 * Used to derive `Astro.url`
+	 */
+	base?: string;
 	/**
 	 * Value of Astro config's `output` option, true if "server" or "hybrid"
 	 */
diff --git a/packages/astro/src/core/render/result.ts b/packages/astro/src/core/render/result.ts
index 72fa4ddcf..987d5c280 100644
--- a/packages/astro/src/core/render/result.ts
+++ b/packages/astro/src/core/render/result.ts
@@ -36,6 +36,10 @@ export interface CreateResultArgs {
 	 * Used for `Astro.site`
 	 */
 	site: string | undefined;
+	/**
+	 * Used for `Astro.url`. A stable route usually derived from `RouteData`.
+	 */
+	routeUrl: URL;
 	links?: Set<SSRElement>;
 	scripts?: Set<SSRElement>;
 	styles?: Set<SSRElement>;
@@ -126,7 +130,6 @@ class Slots {
 export function createResult(args: CreateResultArgs): SSRResult {
 	const { params, request, resolve, locals } = args;
 
-	const url = new URL(request.url);
 	const headers = new Headers();
 	headers.set('Content-Type', 'text/html');
 	const response: ResponseInit = {
@@ -195,7 +198,7 @@ export function createResult(args: CreateResultArgs): SSRResult {
 				props,
 				locals,
 				request,
-				url,
+				url: args.routeUrl,
 				redirect(path, status) {
 					// If the response is already sent, error as we cannot proceed with the redirect.
 					if ((request as any)[responseSentSymbol]) {
diff --git a/packages/astro/src/core/routing/index.ts b/packages/astro/src/core/routing/index.ts
index b568bb121..22419cd25 100644
--- a/packages/astro/src/core/routing/index.ts
+++ b/packages/astro/src/core/routing/index.ts
@@ -2,4 +2,5 @@ export { createRouteManifest } from './manifest/create.js';
 export { deserializeRouteData, serializeRouteData } from './manifest/serialization.js';
 export { matchAllRoutes, matchRoute } from './match.js';
 export { getParams } from './params.js';
+export { createRouteUrl } from './url.js';
 export { validateDynamicRouteModule, validateGetStaticPathsResult } from './validation.js';
diff --git a/packages/astro/src/core/routing/url.ts b/packages/astro/src/core/routing/url.ts
new file mode 100644
index 000000000..32b3a0f59
--- /dev/null
+++ b/packages/astro/src/core/routing/url.ts
@@ -0,0 +1,24 @@
+import type { Params, RouteData } from '../../@types/astro.js';
+import { joinPaths } from '../path.js';
+
+interface CreateUrlOptions {
+	params?: Params;
+	site?: string;
+	base?: string;
+}
+
+export function createRouteUrl(route: RouteData, options: CreateUrlOptions) {
+	const site = options.site ?? 'http://localhost:4321';
+	const base = options.base ?? '/';
+
+	// Tests don't implement generate, do a dirty skip here
+	if (route.generate == null) {
+		return new URL(base, site);
+	}
+
+	const pathnameWithoutBase = route.generate(options.params);
+	// If the pathname is empty (root without trailing slash), return it as is so the final
+	// URL also doesn't have a trailing slash
+	const pathname = pathnameWithoutBase === '' ? '' : joinPaths(base, pathnameWithoutBase);
+	return new URL(pathname, site);
+}
diff --git a/packages/astro/src/vite-plugin-astro-server/environment.ts b/packages/astro/src/vite-plugin-astro-server/environment.ts
index ce7b92662..3f68e05b3 100644
--- a/packages/astro/src/vite-plugin-astro-server/environment.ts
+++ b/packages/astro/src/vite-plugin-astro-server/environment.ts
@@ -25,6 +25,7 @@ export function createDevelopmentEnvironment(
 		resolve: createResolve(loader, settings.config.root),
 		routeCache: new RouteCache(logging, mode),
 		site: manifest.site,
+		base: manifest.base,
 		ssr: isServerLikeOutput(settings.config),
 		streaming: true,
 	});
diff --git a/packages/astro/test/astro-get-static-paths.test.js b/packages/astro/test/astro-get-static-paths.test.js
index 66aa5b94d..be13dd34f 100644
--- a/packages/astro/test/astro-get-static-paths.test.js
+++ b/packages/astro/test/astro-get-static-paths.test.js
@@ -29,7 +29,7 @@ describe('getStaticPaths - build calls', () => {
 		const html = await fixture.readFile('/food/tacos/index.html');
 		const $ = cheerio.load(html);
 
-		expect($('#url').text()).to.equal('/blog/food/tacos/');
+		expect($('#url').text()).to.equal('/blog/food/tacos');
 	});
 });
 
diff --git a/packages/astro/test/astro-global.test.js b/packages/astro/test/astro-global.test.js
index f003bc035..7959ea0d4 100644
--- a/packages/astro/test/astro-global.test.js
+++ b/packages/astro/test/astro-global.test.js
@@ -24,16 +24,16 @@ describe('Astro Global', () => {
 			await devServer.stop();
 		});
 
-		it('Astro.request.url', async () => {
+		it('Astro.url', async () => {
 			const res = await await fixture.fetch('/blog/?foo=42');
 			expect(res.status).to.equal(200);
 
 			const html = await res.text();
 			const $ = cheerio.load(html);
-			expect($('#pathname').text()).to.equal('/blog/');
+			expect($('#pathname').text()).to.equal('/blog');
 			expect($('#searchparams').text()).to.equal('{}');
-			expect($('#child-pathname').text()).to.equal('/blog/');
-			expect($('#nested-child-pathname').text()).to.equal('/blog/');
+			expect($('#child-pathname').text()).to.equal('/blog');
+			expect($('#nested-child-pathname').text()).to.equal('/blog');
 		});
 
 		it('Astro.glob() returned `url` metadata of each markdown file extensions DOES NOT include the extension', async () => {
diff --git a/packages/astro/test/ssr-prerender-get-static-paths.test.js b/packages/astro/test/ssr-prerender-get-static-paths.test.js
index 3fe2950cb..45c71c86c 100644
--- a/packages/astro/test/ssr-prerender-get-static-paths.test.js
+++ b/packages/astro/test/ssr-prerender-get-static-paths.test.js
@@ -38,7 +38,7 @@ describe('Prerender', () => {
 				const $ = cheerio.load(html);
 
 				expect($('#props').text()).to.equal('10');
-				expect($('#url').text()).to.equal('/blog/food/tacos/');
+				expect($('#url').text()).to.equal('/blog/food/tacos');
 			});
 		});
 
@@ -169,7 +169,7 @@ describe('Prerender', () => {
 				const $ = cheerio.load(html);
 
 				expect($('#props').text()).to.equal('10');
-				expect($('#url').text()).to.equal('/blog/food/tacos/');
+				expect($('#url').text()).to.equal('/blog/food/tacos');
 			});
 		});
 
diff --git a/packages/astro/test/ssr-request.test.js b/packages/astro/test/ssr-request.test.js
index 7bdce20b5..01fe1043a 100644
--- a/packages/astro/test/ssr-request.test.js
+++ b/packages/astro/test/ssr-request.test.js
@@ -50,8 +50,8 @@ describe('Using Astro.request in SSR', () => {
 		const html = await response.text();
 		const $ = cheerioLoad(html);
 		expect($('#origin').text()).to.equal('http://example.com');
-		expect($('#pathname').text()).to.equal('/subpath/request/');
-		expect($('#request-pathname').text()).to.equal('/subpath/request/');
+		expect($('#pathname').text()).to.equal('/subpath/request');
+		expect($('#request-pathname').text()).to.equal('/subpath/request');
 	});
 
 	it('public file is copied over', async () => {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a45afb8b2..538817c57 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -18263,25 +18263,21 @@ packages:
   file:packages/astro/test/fixtures/css-assets/packages/font-awesome:
     resolution: {directory: packages/astro/test/fixtures/css-assets/packages/font-awesome, type: directory}
     name: '@test/astro-font-awesome-package'
-    version: 0.0.1
     dev: false
 
   file:packages/astro/test/fixtures/multiple-renderers/renderers/one:
     resolution: {directory: packages/astro/test/fixtures/multiple-renderers/renderers/one, type: directory}
     name: '@test/astro-renderer-one'
-    version: 1.0.0
     dev: false
 
   file:packages/astro/test/fixtures/multiple-renderers/renderers/two:
     resolution: {directory: packages/astro/test/fixtures/multiple-renderers/renderers/two, type: directory}
     name: '@test/astro-renderer-two'
-    version: 1.0.0
     dev: false
 
   file:packages/astro/test/fixtures/solid-component/deps/solid-jsx-component:
     resolution: {directory: packages/astro/test/fixtures/solid-component/deps/solid-jsx-component, type: directory}
     name: '@test/solid-jsx-component'
-    version: 0.0.0
     dependencies:
       solid-js: 1.7.6
     dev: false