Is it possible to modify incoming c.req?

[nedimaf]

I have a middleware which should attach new header to the specific incoming requests and pass them further. It seems that c.req.header can only get the existing header, but not modify them. Also, c.headers can add new header, but not to the specific request. Is there any alternative for headers modification?

[yusukebe]

Hi @nedimaf

You should create a new Request object to modify headers. If you want to use it in c.req, you can write like the following hack-way:

app.get('/', (c) => {
  const req = new Request(c.req.raw)
  req.headers.append('foo', 'bar')
  c.req.raw = req
  return c.text(c.req.header('foo'))
})

[nedimaf]

@yusukebe that works! Thank you very much :)