Fastify
## Request
The first parameter of the handler function is `Request`.
Request is a core Fastify object containing the following fields:
- `query` - the parsed querystring, its format is specified by [`querystringParser`](Server.md#querystringparser)
- `body` - the body
- `params` - the params matching the URL
- [`headers`](#headers) - the headers getter and setter
- `raw` - the incoming HTTP request from Node core
- `req` *(deprecated, use `.raw` instead)* - the incoming HTTP request from Node core
- `server` - The Fastify server instance, scoped to the current [encapsulation context](Encapsulation.md)
- `id` - the request ID
- `log` - the logger instance of the incoming request
- `ip` - the IP address of the incoming request
- `ips` - an array of the IP addresses, ordered from closest to furthest, in the `X-Forwarded-For` header of the incoming request (only when the [`trustProxy`](Server.md#factory-trust-proxy) option is enabled)
- `hostname` - the host of the incoming request (derived from `X-Forwarded-Host` header when the [`trustProxy`](Server.md#factory-trust-proxy) option is enabled). For HTTP/2 compatibility it returns `:authority` if no host header exists.
- `protocol` - the protocol of the incoming request (`https` or `http`)
- `method` - the method of the incoming request
- `url` - the URL of the incoming request
- `routerMethod` - the method defined for the router that is handling the request
- `routerPath` - the path pattern defined for the router that is handling the request
- `is404` - true if request is being handled by 404 handler, false if it is not
- `connection` - Deprecated, use `socket` instead. The underlying connection of the incoming request.
- `socket` - the underlying connection of the incoming request
- `context` - A Fastify internal object. You should not use it directly or modify it. It is useful to access one special key:
- `context.config` - The route [`config`](Routes.md#routes-config) object.
### Headers
The `request.headers` is a getter that returns an Object with the headers of the incoming request.
You can set custom headers like this:
```js
request.headers = {
'foo': 'bar',
'baz': 'qux'
}
```
This operation will add to the request headers the new values that can be read calling `request.headers.bar`.
Moreover, you can still access the standard request's headers with the `request.raw.headers` property.
```js
fastify.post('/:params', options, function (request, reply) {
console.log(request.body)
console.log(request.query)
console.log(request.params)
console.log(request.headers)
console.log(request.raw)
console.log(request.server)
console.log(request.id)
console.log(request.ip)
console.log(request.ips)
console.log(request.hostname)
console.log(request.protocol)
console.log(request.url)
console.log(request.routerMethod)
console.log(request.routerPath)
request.log.info('some info')
})
```