diff --git a/contributors.yml b/contributors.yml
index 98f300e6d0..58131406b9 100644
--- a/contributors.yml
+++ b/contributors.yml
@@ -115,6 +115,7 @@
 - dokeet
 - doytch
 - Drishtantr
+- edmundhung
 - edwin177
 - eiffelwong1
 - ek9
diff --git a/integration/vite-plugin-cloudflare-test.ts b/integration/vite-plugin-cloudflare-test.ts
index 3bacaeab7d..d6794c7d41 100644
--- a/integration/vite-plugin-cloudflare-test.ts
+++ b/integration/vite-plugin-cloudflare-test.ts
@@ -1,7 +1,13 @@
 import { expect } from "@playwright/test";
 import dedent from "dedent";
 
-import { type Files, test, viteConfig } from "./helpers/vite.js";
+import {
+  type Files,
+  test,
+  viteConfig,
+  createProject,
+  build,
+} from "./helpers/vite.js";
 
 const tsx = dedent;
 const css = dedent;
@@ -121,4 +127,15 @@ test.describe("vite-plugin-cloudflare", () => {
       "20px",
     );
   });
+
+  test("builds project with default server entry", async () => {
+    const files = defineFiles();
+    const cwd = await createProject(
+      await files({ port: 0 }),
+      "vite-plugin-cloudflare-template",
+    );
+    const buildResult = build({ cwd });
+
+    expect(buildResult.status).toBe(0);
+  });
 });
diff --git a/packages/react-router-dev/cli/commands.ts b/packages/react-router-dev/cli/commands.ts
index 3e4d615932..45aa60240d 100644
--- a/packages/react-router-dev/cli/commands.ts
+++ b/packages/react-router-dev/cli/commands.ts
@@ -142,11 +142,6 @@ export async function generateEntry(
   let pkgJson = await readPackageJSON(rootDirectory);
   let deps = pkgJson.dependencies ?? {};
 
-  if (!deps["@react-router/node"]) {
-    console.error(colors.red(`No default server entry detected.`));
-    return;
-  }
-
   let defaultsDirectory = path.resolve(
     path.dirname(require.resolve("@react-router/dev/package.json")),
     "dist",
@@ -157,7 +152,9 @@ export async function generateEntry(
 
   let defaultEntryServer = path.resolve(
     defaultsDirectory,
-    `entry.server.node.tsx`,
+    deps["@react-router/node"]
+      ? `entry.server.node.tsx`
+      : `entry.server.web.tsx`,
   );
 
   let isServerEntry = entry === "entry.server";
diff --git a/packages/react-router-dev/config/config.ts b/packages/react-router-dev/config/config.ts
index 0f54b23466..40b9174238 100644
--- a/packages/react-router-dev/config/config.ts
+++ b/packages/react-router-dev/config/config.ts
@@ -994,12 +994,6 @@ export async function resolveEntryFiles({
     let pkgJson = await readPackageJSON(packageJsonDirectory);
     let deps = pkgJson.dependencies ?? {};
 
-    if (!deps["@react-router/node"]) {
-      throw new Error(
-        `Could not determine server runtime. Please install @react-router/node, or provide a custom entry.server.tsx/jsx file in your app directory.`,
-      );
-    }
-
     if (!deps["isbot"]) {
       console.log(
         "adding `isbot@5` to your package.json, you should commit this change",
@@ -1019,7 +1013,9 @@ export async function resolveEntryFiles({
       });
     }
 
-    entryServerFile = `entry.server.node.tsx`;
+    entryServerFile = deps["@react-router/node"]
+      ? `entry.server.node.tsx`
+      : `entry.server.web.tsx`;
   }
 
   let entryClientFilePath = userEntryClientFile
diff --git a/packages/react-router-dev/config/defaults/entry.server.node.tsx b/packages/react-router-dev/config/defaults/entry.server.node.tsx
index 657d19c76f..93c6099f8a 100644
--- a/packages/react-router-dev/config/defaults/entry.server.node.tsx
+++ b/packages/react-router-dev/config/defaults/entry.server.node.tsx
@@ -5,7 +5,16 @@ import { createReadableStreamFromReadable } from "@react-router/node";
 import { ServerRouter } from "react-router";
 import { isbot } from "isbot";
 import type { RenderToPipeableStreamOptions } from "react-dom/server";
-import { renderToPipeableStream } from "react-dom/server";
+import * as ReactDOMServer from "react-dom/server";
+
+// ReactDOMServer.renderToPipeableStream is only available in Node.js
+if (typeof ReactDOMServer.renderToPipeableStream !== "function") {
+  throw new Error(
+    `Running the Node.js server entry on a non-Node runtime. ` +
+      `React Router uses this when @react-router/node is listed in your dependencies. ` +
+      `Remove it, or provide a custom entry.server.tsx/jsx file in your app directory.`,
+  );
+}
 
 export const streamTimeout = 5_000;
 
@@ -44,7 +53,7 @@ export default function handleRequest(
       streamTimeout + 1000,
     );
 
-    const { pipe, abort } = renderToPipeableStream(
+    const { pipe, abort } = ReactDOMServer.renderToPipeableStream(
       <ServerRouter context={routerContext} url={request.url} />,
       {
         [readyOption]() {
diff --git a/integration/helpers/vite-plugin-cloudflare-template/app/entry.server.tsx b/packages/react-router-dev/config/defaults/entry.server.web.tsx
similarity index 55%
rename from integration/helpers/vite-plugin-cloudflare-template/app/entry.server.tsx
rename to packages/react-router-dev/config/defaults/entry.server.web.tsx
index 113e32c94e..0c873ccc0c 100644
--- a/integration/helpers/vite-plugin-cloudflare-template/app/entry.server.tsx
+++ b/packages/react-router-dev/config/defaults/entry.server.web.tsx
@@ -1,24 +1,46 @@
 import type { AppLoadContext, EntryContext } from "react-router";
 import { ServerRouter } from "react-router";
 import { isbot } from "isbot";
-import { renderToReadableStream } from "react-dom/server";
+import * as ReactDOMServer from "react-dom/server";
+
+// ReactDOMServer.renderToReadableStream is not available in Node.js until React 19.2.0+
+if (typeof ReactDOMServer.renderToReadableStream !== "function") {
+  throw new Error(
+    `ReactDOMServer.renderToReadableStream() is not available. ` +
+      `React Router uses this API when @react-router/node is not installed. ` +
+      `Please install @react-router/node, or provide a custom entry.server.tsx/jsx file in your app directory.`,
+  );
+}
+
+export const streamTimeout = 5_000;
 
 export default async function handleRequest(
   request: Request,
   responseStatusCode: number,
   responseHeaders: Headers,
   routerContext: EntryContext,
-  _loadContext: AppLoadContext,
+  loadContext: AppLoadContext,
+  // If you have middleware enabled:
+  // loadContext: RouterContextProvider
 ) {
+  // https://httpwg.org/specs/rfc9110.html#HEAD
+  if (request.method.toUpperCase() === "HEAD") {
+    return new Response(null, {
+      status: responseStatusCode,
+      headers: responseHeaders,
+    });
+  }
+
   let shellRendered = false;
-  const userAgent = request.headers.get("user-agent");
+  let userAgent = request.headers.get("user-agent");
 
-  const body = await renderToReadableStream(
+  const body = await ReactDOMServer.renderToReadableStream(
     <ServerRouter context={routerContext} url={request.url} />,
     {
+      signal: AbortSignal.timeout(streamTimeout + 1000),
       onError(error: unknown) {
         responseStatusCode = 500;
-        // Log streaming rendering errors from inside the shell.  Don't log
+        // Log streaming rendering errors from inside the shell. Don't log
         // errors encountered during initial shell rendering since they'll
         // reject and get logged in handleDocumentRequest.
         if (shellRendered) {