Agfdhyk

Friends, I've gone through lot's of examples, which are available on S.O. Though I haven't received proper answer, and still I'm facing issue in getting data via api request using URLSession with Post request & passing parameters with it.

First, I'ld like to show you, what I have. tried till now...

func requestApiCall(){



    let renewal_id = ""

    let policy_no = ""

    let client_name = ""

    let client_id = ""

    let product_name = ""

    let created_date_from = ""

    let created_date_to = ""

    let policy_expiry_from = ""

    let policy_expiry_to = ""



    self.parameters = ["renewal_id":renewal_id,"policy_no":policy_no,"client_name":client_name,"client_id":client_id,"product_name":product_name,"created_date_from":created_date_from,"created_date_to":created_date_to,"policy_expiry_from":policy_expiry_from,"policy_expiry_to":policy_expiry_to]



    let config = URLSessionConfiguration.default

    config.httpAdditionalHeaders = [

        "Accept" : "application/json",

        "Content-Type" : "application/x-www-form-urlencoded"

    ]

    let session = URLSession(configuration: config)

    let Url = String(format: "http://myapi-url");

    let serviceUrl = URL(string: Url)

    var request = URLRequest(url: serviceUrl!)

    print(request.url!)

    request.httpMethod = "POST"

    request.timeoutInterval = 60



    request.httpBody  = try! JSONSerialization.data(withJSONObject: parameters!, options: )



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



        if error == nil{

            print(response!)

        }

        else {

            print(error?.localizedDescription as Any)

        }



        print(response!)

        guard let httpResponse = response as? HTTPURLResponse, let receivedData = data

            else {

                print("error: not a valid http response")

                return

        }



        switch (httpResponse.statusCode)

        {

        case 200: //The request was fulfilled

            let response = NSString (data: receivedData, encoding: String.Encoding.utf8.rawValue)



            if response == "SUCCESS"

            {

                print("Network - HandShaking Successfull...!!!")

            }

            else{

                print("Network - HandShaking is not successfull...!!!")

            }



        case 400:

            print("response-status - 400 : The request had bad syntax or was inherently impossible to be satisfied.")

        case 500:

            print("nresponse-status - 500 : Internal Server Error...!!!")

        default:

            print("response-status - Unknown : Received Response =>  (httpResponse.statusCode)")

        }

    })

    task.resume()

}

After running above function, I'm getting httpResponse.statusCode = 500

But when I run this in postman, I get response properly, as aspected.

Postman Api-Request

Also I have tried to generate code-snippets through postman...which are as follow...

func postmanSnippetApiCall(){

    let headers = [

        "Content-Type": "application/x-www-form-urlencoded",

        "cache-control": "no-cache",

        "Postman-Token": "5d571157-86c5-4eac-ba6d-b00779ae5dbd"

    ]



    let postData = NSMutableData(data: "renewal_id=".data(using: String.Encoding.utf8)!)

    postData.append("&policy_no=".data(using: String.Encoding.utf8)!)

    postData.append("&client_name=".data(using: String.Encoding.utf8)!)

    postData.append("&client_id=".data(using: String.Encoding.utf8)!)

    postData.append("&product_name=".data(using: String.Encoding.utf8)!)

    postData.append("&created_date_from=".data(using: String.Encoding.utf8)!)

    postData.append("&created_date_to=".data(using: String.Encoding.utf8)!)

    postData.append("&policy_expiry_from=".data(using: String.Encoding.utf8)!)

    postData.append("&policy_expiry_to=".data(using: String.Encoding.utf8)!)

    postData.append("&undefined=undefined".data(using: String.Encoding.utf8)!)



    let request = NSMutableURLRequest(url: NSURL(string: "http://myapiurl")! as URL,

                                      cachePolicy: .useProtocolCachePolicy,

                                      timeoutInterval: 10.0)

    request.httpMethod = "POST"

    request.allHTTPHeaderFields = headers

    request.httpBody = postData as Data



    let session = URLSession.shared

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

        if (error != nil) {

            print(error)

        } else {

            let httpResponse = response as? HTTPURLResponse

            print(httpResponse)

        }

    })



    dataTask.resume()

}

But in postman generated code snippet, I'm receiving error on this line i.e request.httpBody = postData as Data and error is this one : Cannot convert value of type 'NSMutableData' to type 'Data' in coercion

If I use thirdParty Library i.e Alamofire, then I'm able to get data very easily.

Alamofire code snippet...runs perfectly..& gives proper response.

func apiRequestByAlamofire(){

        let urlString = "http://myapiurl"



        let params: [String: Any]? = ["renewal_id":"","policy_no":"","client_name":"","client_id":"","product_name":"","created_date_from":"","created_date_to":"","policy_expiry_from":"","policy_expiry_to":""]



        Alamofire.request(urlString, method: .post, parameters: params).responseJSON { response in

            print(response) //Here getting perfect response successfully...!!!

        }



    }

But still I'm struggling this via URLSession...!!!

And still I doubt, that why I'm getting too much problems, while doing with URLSession.

Friends for above my doubt, please I'm open to your suggestions, as well as please help me out to understand it.

Don't know, where am I going wrong. please help me out here.

I am giving you simple function, You can edit this function as per your requirement. You can change your URL and params as well. And in the response, I have written two-line if you are taking JSON array from the server then use the first one if you are taking object then second one else remove Both lines.

func abc()  {

    let request = NSMutableURLRequest(url: URL(string: "Your URL")!)

    request.httpMethod = "POST"

    let postString = "param_name_one=( value_1 )&param_name_two=(value_2)&........."

    request.httpBody = postString.data(using: String.Encoding.utf8)

    let task = URLSession.shared.dataTask(with: request as URLRequest) {

        data, response, error in

        if(error != nil){

            // Show Error Message

        } else{

            do {

                //For JSON ARRAY

                let jsonItem  = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSArray

                let json = jsonItem[0] as AnyObject

               //For JSON object 

                let json_object  = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as AnyObject

                print(json_object)



            } catch {



            }

        }

    }

    task.resume();

}

Hopefully this function will help you!

Try to add the headers in URLRequest instead of URLSession directly and also try different Content-Types and Accepts like application/json, application/x-www-form-urlencoded etc..

let config = URLSessionConfiguration.default

config.timeoutIntervalForRequest = TimeInterval(30)

config.timeoutIntervalForResource = TimeInterval(30)



let session = URLSession(configuration: config)

let Url = String(format: "http://myapi-url")

let serviceUrl = URL(string: Url)



var request = URLRequest(url: serviceUrl!)

print(request.url!)



request.httpMethod = "POST"



let parameters: [String: Any]? = //Request parameters in Dictionary format like ["user_id": 2, "name": "TestUser"]



//Set body to url request

if parameters != nil {



    do {

        let bodyData = try JSONSerialization.data(withJSONObject: parameters!,

                                                  options: JSONSerialization.WritingOptions.prettyPrinted)

        request.httpBody = bodyData

    } catch let error {

        print(error.localizedDescription)

    }

}



request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type") //Try different types of Content-Types here like "application/json", etc.

request.addValue("application/json", forHTTPHeaderField: "Accept") //Try different types of Content-Types here like "application/json", etc.



let task = session.dataTask(with: request) { (data, response, error) in



    // Your code here

    guard data != nil && error == nil else {

        return

    }



    let apiResponse = String.init(data: data!, encoding: String.Encoding.utf8)!

    print(apiResponse)

}



task.resume()

session.finishTasksAndInvalidate()

Please visit the link below for how to code with URLSession.

https://github.com/sateeshyegireddi/MovieFlix/blob/master/MovieFlix/MovieFlix/API/APIHandler.swift