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Update middleware matcher docs to mention has matching #63533

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Mar 20, 2024
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Update middleware matcher docs to mention has matching #63533

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Update middleware matcher docs to mention has matching
ijjk Mar 20, 2024
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ijjk Mar 20, 2024
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16 changes: 15 additions & 1 deletion docs/02-app/01-building-your-application/01-routing/13-middleware.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,7 @@ export const config = {
}
```

You can also ignore prefetches (from `next/link`) that don't need to go through the Middleware using the `missing` array:
You can also bypass Middleware for certain requests by using the `missing` or `has` arrays, or a combination of both:

```js filename="middleware.js"
export const config = {
Expand All @@ -116,6 +116,20 @@ export const config = {
{ type: 'header', key: 'purpose', value: 'prefetch' },
],
},

{
source: '/((?!api|_next/static|_next/image|favicon.ico).*)',
has: [
{ type: 'header', key: 'next-router-prefetch' },
{ type: 'header', key: 'purpose', value: 'prefetch' },
],
},

{
source: '/((?!api|_next/static|_next/image|favicon.ico).*)',
has: [{ type: 'header', key: 'x-present' }],
missing: [{ type: 'header', key: 'x-missing', value: 'prefetch' }],
},
],
}
```
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