Alamofire/Source/RedirectHandler.swift

//
//  RedirectHandler.swift
//
//  Copyright (c) 2014-2018 Alamofire Software Foundation (http://alamofire.org/)
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation

/// A type that handles how an HTTP redirect response from a remote server should be redirected to the new request.
public protocol RedirectHandler {
    /// Determines how the HTTP redirect response should be redirected to the new request.
    ///
    /// The `completion` closure should be passed one of three possible options:
    ///
    ///   1. The new request specified by the redirect (this is the most common use case).
    ///   2. A modified version of the new request (you may want to route it somewhere else).
    ///   3. A `nil` value to deny the redirect request and return the body of the redirect response.
    ///
    /// - Parameters:
    ///   - task:       The task whose request resulted in a redirect.
    ///   - request:    The URL request object to the new location specified by the redirect response.
    ///   - response:   The response containing the server's response to the original request.
    ///   - completion: The closure to execute containing the new request, a modified request, or `nil`.
    func task(_ task: URLSessionTask,
              willBeRedirectedTo request: URLRequest,
              for response: HTTPURLResponse,
              completion: @escaping (URLRequest?) -> Void)
}