feat: unify preview config, support proxy configuration from Astro and Vite

packages/astro/src/core/preview/index.ts

@@ -66,16 +66,19 @@ export default async function preview(inlineConfig: AstroInlineConfig): Promise<
 	if (typeof previewModule.default !== 'function') {
 		throw new Error(`[preview] ${settings.adapter.name} cannot preview your app.`);
 	}
-
+	const previewConfig = Object.assign({},
+		settings.config.vite.server,
+		settings.config.vite.preview,
+		settings.config.server,
+	)
 	const server = await previewModule.default({
+		...previewConfig,
 		outDir: settings.config.outDir,
 		client: settings.config.build.client,
 		serverEntrypoint: new URL(settings.config.build.serverEntry, settings.config.build.server),
-		host: getResolvedHostForHttpServer(settings.config.server.host),
+		host: getResolvedHostForHttpServer(previewConfig.host),
-		port: settings.config.server.port,
 		base: settings.config.base,
 		logger: new AstroIntegrationLogger(logger.options, settings.adapter.name),
-		headers: settings.config.server.headers,
 	});
 
 	return server;

packages/astro/src/core/preview/static-preview-server.ts

@@ -23,6 +23,12 @@ export default async function createStaticPreviewServer(
 	const startServerTime = performance.now();
 
 	let previewServer: VitePreviewServer;
+
+	const previewConfig = Object.assign({},
+		settings.config.vite.server,
+		settings.config.vite.preview,
+		settings.config.server,
+	)
 	try {
 		previewServer = await preview({
 			configFile: false,
@@ -31,12 +37,7 @@ export default async function createStaticPreviewServer(
 			build: {
 				outDir: fileURLToPath(settings.config.outDir),
 			},
-			preview: {
+			preview: previewConfig,
-				host: settings.config.server.host,
-				port: settings.config.server.port,
-				headers: settings.config.server.headers,
-				open: settings.config.server.open,
-			},
 			plugins: [vitePluginAstroPreview(settings)],
 		});
 	} catch (err) {