Add Add Web Server Layer Redirects as a Vercel til

vercel/add-web-server-layer-redirects.md

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+# Add Web Server Layer Redirects
+
+People create links and bookmark URLs. Content, for a variety of reasons, has
+to move from one place to another. For everyone's sake, you don't want to break
+the URLs that people have come to rely on.
+
+You need to setup some
+[redirects](https://vercel.com/docs/configuration#project/redirects).
+
+Though a [Next.js](https://nextjs.org/) app is just frontend code, when
+distributed through [Vercel](https://vercel.com/), you can include some
+configuration of the web server layer.
+
+Add the `vercel.json` file to the top-level directory of your Next.js project
+and then include any needed redirect rules.
+
+```json
+{
+  "redirects": [
+    {
+      "source": "blog/old-blog-post-name",
+      "destination": "blog/new-blog-post-name"
+    },
+    {
+      "source": "/store",
+      "destination": "store.example.com"
+    }
+  ]
+}
+```
+
+In the first rule, one path is redirected to another for the same domain. In
+the second rule, the path is redirected to an external URL.
+
+By default, these redirects get a [308 status
+code](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/308#:~:text=The%20HyperText%20Transfer%20Protocol%20(HTTP,given%20by%20the%20Location%20headers.).