fix(azure): prevent azure-swa runtime errors, and response body returning {}

docs/2.deploy/20.providers/azure.md

@@ -12,7 +12,7 @@
 Integration with this provider is possible with [zero configuration](/deploy/#zero-config-providers).
 ::
 
-[Azure Static Web Apps](https://azure.microsoft.com/en-us/products/app-service/static) are designed to be deployed continuously in a [GitHub Actions workflow](https://docs.microsoft.com/en-us/azure/static-web-apps/github-actions-workflow). By default, Nitro will detect this deployment environment and enable the `azure` preset.
+[Azure Static Web Apps](https://azure.microsoft.com/en-us/products/app-service/static) are designed to be deployed continuously in a [GitHub Actions workflow](https://docs.microsoft.com/en-us/azure/static-web-apps/github-actions-workflow). By default, Nitro will detect this deployment environment and enable the `azure-swa` preset.
 
 ### Local preview
 
@@ -21,7 +21,7 @@ Install [Azure Functions Core Tools](https://docs.microsoft.com/en-us/azure/azur
 You can invoke a development environment to preview before deploying.
 
 ```bash
-NITRO_PRESET=azure npx nypm@latest build
+NITRO_PRESET=azure-swa npx nypm@latest build
 npx @azure/static-web-apps-cli start .output/public --api-location .output/server
 ```
 
@@ -32,11 +32,14 @@ Azure Static Web Apps are [configured](https://learn.microsoft.com/en-us/azure/s
 Nitro automatically generates this configuration file whenever the application is built with the `azure` preset.
 
 Nitro will automatically add the following properties based on the following criteria:
-| Property | Criteria | Default |
-| --- | --- | --- |
-| **[platform.apiRuntime](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#platform)** | Will automatically set to `node:16` or `node:14` depending on your package configuration. | `node:16` |
-| **[navigationFallback.rewrite](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#fallback-routes)** | Is always `/api/server` | `/api/server` |
-| **[routes](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#routes)** | All prerendered routes are added. Additionally, if you do not have an `index.html` file an empty one is created for you for compatibility purposes and also requests to `/index.html` are redirected to the root directory which is handled by `/api/server`.  | `[]` |
+
+
+| Property                                                                                                                | Criteria                                                                                                                                                                                                                                                      | Default       |
+| ----------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------- |
+| **[platform.apiRuntime](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#platform)**               | Uses `node:20` or `node:22` when `package.json` `engines.node` (or your current Node major version) matches those supported versions; otherwise falls back to `node:18`.                                                                                      | `node:18`     |
+| **[navigationFallback.rewrite](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#fallback-routes)** | Is always `/api/server`                                                                                                                                                                                                                                       | `/api/server` |
+| **[routes](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#routes)**                              | All prerendered routes are added. Additionally, if you do not have an `index.html` file an empty one is created for you for compatibility purposes and also requests to `/index.html` are redirected to the root directory which is handled by `/api/server`. | `[]`          |
+
 
 ### Custom configuration
 
@@ -50,12 +53,14 @@ When you link your GitHub repository to Azure Static Web Apps, a workflow file i
 
 When you are asked to select your framework, select custom and provide the following information:
 
-| Input | Value |
-| --- | --- |
-| **app_location** | '/' |
-| **api_location** | '.output/server' |
+
+| Input               | Value            |
+| ------------------- | ---------------- |
+| **app_location**    | '/'              |
+| **api_location**    | '.output/server' |
 | **output_location** | '.output/public' |
 
+
 If you miss this step, you can always find the build configuration section in your workflow and update the build configuration:
 
 ```yaml [.github/workflows/azure-static-web-apps-<RANDOM_NAME>.yml]
@@ -68,5 +73,4 @@ output_location: '.output/public'
 
 That's it! Now Azure Static Web Apps will automatically deploy your Nitro-powered application on push.
 
-If you are using runtimeConfig, you will likely want to configure the corresponding [environment variables on Azure](https://docs.microsoft.com/en-us/azure/static-web-apps/application-settings).
-
+If you are using runtimeConfig, you will likely want to configure the corresponding [environment variables on Azure](https://docs.microsoft.com/en-us/azure/static-web-apps/application-settings).

src/presets/azure/runtime/_utils.ts

@@ -1,4 +1,4 @@
-import type { Cookie } from "@azure/functions";
+import type { Cookie, HttpRequest } from "@azure/functions";
 import { parse } from "cookie-es";
 
 export function getAzureParsedCookiesFromHeaders(headers: Headers): Cookie[] {
@@ -32,6 +32,24 @@ export function getAzureParsedCookiesFromHeaders(headers: Headers): Cookie[] {
   return azureCookies;
 }
 
+export function resolveBaseUrl(req: HttpRequest) {
+  const forwardedProto = req.headers["x-forwarded-proto"];
+  const forwardedHost = req.headers["x-forwarded-host"];
+  const host = forwardedHost || req.headers["host"];
+  if (host) {
+    return `${forwardedProto || "http"}://${host}`;
+  }
+  const originalUrl = req.headers["x-ms-original-url"];
+  if (originalUrl) {
+    try {
+      return new URL(originalUrl).origin;
+    } catch {
+      // ignore invalid original URL
+    }
+  }
+  return "http://localhost";
+}
+
 function parseNumberOrDate(expires: string) {
   const expiresAsNumber = parseNumber(expires);
   if (expiresAsNumber !== undefined) {

src/presets/azure/runtime/azure-swa.ts

@@ -1,7 +1,7 @@
 import "#nitro/virtual/polyfills";
 import { parseURL } from "ufo";
 import { useNitroApp } from "nitro/app";
-import { getAzureParsedCookiesFromHeaders } from "./_utils.ts";
+import { getAzureParsedCookiesFromHeaders, resolveBaseUrl } from "./_utils.ts";
 
 import type { HttpRequest, HttpResponse, HttpResponseSimple } from "@azure/functions";
 
@@ -19,8 +19,9 @@ export async function handle(context: { res: HttpResponse }, req: HttpRequest) {
     url = "/api/" + (req.params.url || "");
   }
 
-  const request = new Request(url, {
+  const request = new Request(new URL(url, resolveBaseUrl(req)), {
     method: req.method || undefined,
+    headers: new Headers(req.headers),
     // https://github.com/Azure/azure-functions-nodejs-worker/issues/294
     // https://github.com/Azure/azure-functions-host/issues/293
     body: req.bufferBody ?? req.rawBody,
@@ -32,7 +33,7 @@ export async function handle(context: { res: HttpResponse }, req: HttpRequest) {
   // (v4) https://learn.microsoft.com/en-us/azure/azure-functions/functions-reference-node?tabs=typescript%2Cwindows%2Cazure-cli&pivots=nodejs-model-v4#http-response
   context.res = {
     status: response.status,
-    body: response.body,
+    body: response.body ? Buffer.from(await response.arrayBuffer()) : undefined,
     cookies: getAzureParsedCookiesFromHeaders(response.headers),
     headers: Object.fromEntries(
       [...response.headers.entries()].filter(([key]) => key !== "set-cookie")