具有修改有效负载的 Alamofire 重试请求

Question

我一直在考虑在收到某个 400 错误时利用 alamofire 重试请求，到目前为止重试有效，但我不确定是否可以修改请求对象，以便在重试时它具有更新的有效负载。

欢迎任何建议和阅读材料的链接。

这是我的代码：

class HTTP412Retrier: RequestRetrier, RequestAdapter {
func adapt(_ urlRequest: URLRequest) throws -> URLRequest {
print("called") // this is not being printed 
return urlRequest
}

func should(_ manager: SessionManager, retry request: Request, with error: Error, completion: @escaping RequestRetryCompletion) {
if let response = request.task?.response as? HTTPURLResponse, response.statusCode == 412 {
completion(request.retryCount < 3, 0.0)
} else {
completion(false, 0.0)
}
}
}

Answer 1

文档讨论了适应和重试请求，因此我认为这将是您正在寻找的。

我已经写了以下内容，它按预期命中adapt(_:)函数

import UIKit
import Alamofire
class ViewController: UIViewController {
let sessionManager = Alamofire.SessionManager(configuration: URLSessionConfiguration.default)
override func viewDidLoad() {
super.viewDidLoad()
sessionManager.adapter = AccessTokenAdapter(accessToken: "1234")
sessionManager.request("http://example.com")
}
}
class AccessTokenAdapter: RequestAdapter {
private let accessToken: String
init(accessToken: String) {
self.accessToken = accessToken
}
func adapt(_ urlRequest: URLRequest) throws -> URLRequest {
var urlRequest = urlRequest
guard let urlString = urlRequest.url?.absoluteString, urlString.hasPrefix("https://example.com") else { return urlRequest }
urlRequest.setValue("Bearer " + accessToken, forHTTPHeaderField: "Authorization")
return urlRequest
}
}