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Update middleware documentation for custom server #33535

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merged 4 commits into from
Jan 21, 2022
Merged

Update middleware documentation for custom server #33535

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Update middleware documentation for custom server
saevarb Jan 21, 2022
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ijjk Jan 21, 2022
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lint-fix
ijjk Jan 21, 2022
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Merge branch 'canary' into patch-1
ijjk Jan 21, 2022
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13 changes: 13 additions & 0 deletions docs/middleware.md
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Expand Up @@ -76,6 +76,19 @@ Middleware runs directly after `redirects` and `headers`, before the first files

Middleware uses a [strict runtime](/docs/api-reference/edge-runtime.md) that supports standard Web APIs like `fetch`. This works out of the box using `next start`, as well as on Edge platforms like Vercel, which use [Edge Functions](http://www.vercel.com/edge).

## Custom Server

When using a custom server with middleware, you must specify the hostname and port when instantiating your `NextApp`.
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I wonder if this should be moved to the Custom Server docs, since it only applies to a very small segment of Next.js users who are ejecting for a custom server.


```ts
import next from "next";
// ...
const port = process.env.PORT ? +process.env.PORT : 3000;
const dev = process.env.NODE_ENV !== "production";
const app = next({ dev, customServer: true, hostname: "localhost", port });
```


## Related

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