Access HTTP header values from a request

Use c.req.header(name) to read a single request header:

app.get('/', (c) => {
  const userAgent = c.req.header('User-Agent')
  return c.text(userAgent ?? '')
})

To read all request headers, use c.req.raw.headers:

app.get('/', c => {
  console.log(c.req.raw.headers)
})

Change any HTTP header value for a response

Set response headers with c.header():

c.header('Content-Type', 'text/html')

Lessons in this unit:

0:	Introduction
1:	Your first Hono app
2:	The Request object
3:	Send a response to the client
4:	Manage cookies
5:	▶︎ Work with HTTP headers
6:	Handling redirects
7:	Routing
8:	JSX templates
9:	Middleware
10:	Hono on Node.js