php - HTTPS POST 工作成功，但变量为空

Question

我在这里发布的代码是一个简短的版本，仅包含该问题的要点。经过严格的错误测试后，除了服务器的响应显示“Function”:null 而不是“Function”之外，请求内、服务器内或返回代码内似乎都没有问题:“addUser”，因为它应该。我在两端都做错了什么吗？它似乎只是无法识别发布的变量，但我在其他应用程序和服务器中多次使用了此代码，并且由于某种我看不到的原因，它似乎在这里失败了。感谢您的帮助。

这是我在服务器上的 PHP:

<?php
   $t = $_POST["function"];
   $do = array("Success"=>true, "Function"=> $t);
   echo json_encode($do);
?>

这是我用来发出请求的 swift:

  let params = ["function": "addUser"] as [String: AnyObject]?


    fetchData("https://pdt.pitchprogress.net/SamplePHP.php", token: nil, parameters: params, method: "POST", onCompletion: { (success, data) -> Void in
        if success {
            do {
                let json = try JSON(data: data!)
                if json["Success"].boolValue == true {
                    print("success!")
                    print(json.description)
                    print(json["Function"].stringValue)
               }
              }      
             }       
             })       




func fetchData(_ feed:String,token:String? = nil,parameters:[String:AnyObject]? = nil,method:String? = nil, onCompletion:@escaping (_ success:Bool,_ data:Data?)->Void){

DispatchQueue.main.async {


    if let unwrapped_url = URL(string: feed){
        let request = NSMutableURLRequest(url: unwrapped_url)

        if let parm = parameters {
            if let data = (try? JSONSerialization.data(withJSONObject: parm, options:[])) as Data? {

                request.httpBody = data
                request.setValue("application/json", forHTTPHeaderField: "Content-Type")
                request.setValue("\(data.count)", forHTTPHeaderField: "Content-Length")

            }
        }

        if let unwrapped_method = method {
            request.httpMethod = unwrapped_method
        }

        let sessionConfiguration = URLSessionConfiguration.default
        sessionConfiguration.timeoutIntervalForRequest = 15.0
        let session = URLSession(configuration: sessionConfiguration)

        let taskGetCategories = session.dataTask(with: request as URLRequest, completionHandler: { (responseData, response, error) -> Void in

            let statusCode = (response as! HTTPURLResponse?)?.statusCode
            //println("Status Code: \(statusCode), error: \(error)")
            if error != nil || (statusCode != 200 && statusCode != 201 && statusCode != 202){
                onCompletion(false, nil)

            } else {
                onCompletion(true, responseData)
            }
        })

        taskGetCategories.resume()
    }
}
}

Answer 1

这是因为您以 JSON 形式发送参数，而您的 API 需要将参数作为表单数据。

此代码将参数作为简单的表单帖子发送，并检索到成功的响应。

var request = URLRequest(url: URL(string: "http://app123.freeiz.com/Apis/samples/api4.php")!)
request.httpMethod = "POST"
var postString =  ""
postString.append("function=value") // replace 'function' with your paramname and 'value' with your value'
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=\(String(describing: 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 = \(String(describing: response))")
        }

        let responseString = String(data: data, encoding: .utf8)

        if let unWrappedResponseString = responseString{

            print(unWrappedResponseString)
        }

    }
    task.resume()

我曾经制作过一个用于发送简单表单数据的小包装器，如果我找到它，我将用它更新答案。在那之前你可以尝试一下。让我知道进展如何..