ios - 有没有不同的方式如何发送 HTTP "POST"请求而不使用第三方库使用自定义 header 和正文？

Question

我正在尝试发送一个 HTTP“POST”请求，请求一个应该返回 base64 编码图片的 Web 服务。这是服务的 HTTP 请求示例:

我正在尝试以下操作:

func fetchPicture(username: String, password: String) {
    let url = URL(string: "https://myurl.com/download/bootcamp/image.php")!
    var request = URLRequest(url: url)
    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    request.httpMethod = "POST"
    request.setValue(password.stringToSHA1Hash(), forHTTPHeaderField: "Authorization")
    let postString = "username=\(username)"
    request.httpBody = postString.data(using: .utf8)
    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data, error == nil else {                                                 // check for fundamental networking error
            print("error=\(error)")
            return
        }
        if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {           // check for http errors
            print("statusCode should be 200, but is \(httpStatus.statusCode)")
            print("response = \(response)")
        }
        let responseString = String(data: data, encoding: .utf8)
        print("responseString = \(responseString)")
    }
    task.resume()
}

我收到错误 401 Unauthorized，我实际上不知道这是因为我的请求全部错误还是只是登录名首字母错误。如果有人可以检查代码并告诉我它是否确实对应于上面显示的请求示例，那就太好了。

谢谢!

Answer 1

我注意到的第一件事是您没有设置请求 HTTP 方法:

request.httpMethod = “POST”