iOS url请求问题

Question

我想在ios应用程序中将手机号码和密码发送到服务器。后端团队提供了如下图的 postman API。

作为表单数据发送成功

下面的 Swift URL 请求失败，我在这里做错了什么？

  func sendReq() {
    let Url                 = String(format: "http://xxxxxxx/mobile/request_otp")
    guard let serviceUrl    = URL(string: Url) else { return }
    let parameterDictionary = ["mobile_number" : "xxxxxxxxxx", "password" : "12345678"]
    var request             = URLRequest(url: serviceUrl)
    request.httpMethod      = "POST"
    request.cachePolicy     = .useProtocolCachePolicy
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")

    //  params dict as data
    guard let httpBody = try? JSONSerialization.data(withJSONObject: parameterDictionary, options: []) else {
        return
    }
    request.httpBody        = httpBody

    // session
    let session             = URLSession.shared

    //data task
    session.dataTask(with: request) { (data, response, error) in
        if let response = response {
            print(response)
        }
        if let data = data {
            do {
                let json = try JSONSerialization.jsonObject(with: data, options: [])
                print(json)
            }
            catch {
                print(error)
            }
        }
        }.resume()
}

但是上面的 API 调用会抛出错误，例如

{
    error = TRUE;
    message = "All fields Required!";
}

Answer 1

设置Content-Type HTTP header :

request.allHTTPHeaderFields = ["Content-Type": "application/json"]

这样您就可以通知服务器您正在发送 JSON。