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NextRequest Context problem

Russian Spaniel posted this in #help-forum
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Russian SpanielOP
I would like to understand a behavior in my NextJS application.

For each request a middleware is launched, which looks like this:

export async function middleware(request: NextRequest) {
   request.headers.set('Custom-Header', 'Custom-Value');

Then a custom route is called (route handler):
export async function GET(request: NextRequest) {
   const customHeaderValue = request.headers.get('Custom-Header');
   console.log(customHeaderValue); // null

Could you explain to me why I don't have access to the data defined in the middleware in the GET route ?
So I tried to set various values, but nothing works, and from what I understood the NextRequest object is the context of the current request.

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