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StaticHeaders.scala
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StaticHeaders.scala
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/*
* Copyright 2014 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s
package server.middleware
import cats.Functor
import cats.data.Kleisli
import cats.data.NonEmptyList
import cats.syntax.all._
import org.http4s.headers.`Cache-Control`
/** Simple middleware for adding a static set of headers to responses
* returned by a kleisli.
*/
object StaticHeaders {
def apply[F[_]: Functor, G[_], A](
headers: Headers
)(http: Kleisli[F, A, Response[G]]): Kleisli[F, A, Response[G]] =
Kleisli { req =>
http(req).map(resp => resp.copy(headers = headers ++ resp.headers))
}
private val noCacheHeader = `Cache-Control`(NonEmptyList.of(CacheDirective.`no-cache`()))
def `no-cache`[F[_]: Functor, G[_], A](
http: Kleisli[F, A, Response[G]]
): Kleisli[F, A, Response[G]] =
StaticHeaders(Headers(noCacheHeader))(http)
}