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Max-Forwards.scala
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Max-Forwards.scala
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/*
* Copyright 2013 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 headers
import org.http4s.parser.AdditionalRules
/** Request header, used with the TRACE and OPTION request methods,
* that gives an upper bound on how many times the request can be
* forwarded by a proxy before it is rejected.
*
* [[https://datatracker.ietf.org/doc/html/rfc7231#section-5.1.2 RFC-7231]]
*/
sealed abstract case class `Max-Forwards`(count: Long)
object `Max-Forwards` extends HeaderCompanion[`Max-Forwards`]("Max-Forwards") {
private class MaxForwardsImpl(length: Long) extends `Max-Forwards`(length)
val zero: `Max-Forwards` = new MaxForwardsImpl(0)
def fromLong(length: Long): ParseResult[`Max-Forwards`] =
if (length >= 0L) ParseResult.success(new MaxForwardsImpl(length))
else ParseResult.fail("Invalid Max-Forwards", length.toString)
def unsafeFromLong(length: Long): `Max-Forwards` =
fromLong(length).fold(throw _, identity)
private[http4s] val parser = AdditionalRules.NonNegativeLong.mapFilter(l => fromLong(l).toOption)
implicit val headerInstance: Header[`Max-Forwards`, Header.Single] =
createRendered(_.count)
}