Unable to post parameters in post request ios swift - ios

Question

I'm trying to send these parameters as a post request to the URL but the parameters are not getting sent. I don't know whether is URLSession configuration issue. Can anyone check and solve the issue?
import UIKit
let json: [String: Any] = [
"set_id" : "20",
"user_id" : "30",
"type" : "contact",
"contact_name" : "shinto"
]
let jsonData = try? JSONSerialization.data(withJSONObject: json)
var str = String(data: jsonData!, encoding: .utf8)
let url = URL(string: "****.php")!
var request = URLRequest(url: url)
request.httpMethod = "Post"
request.httpBody = str!.data(using: .utf8)
let session = URLSession(configuration: .default)
let task = session.dataTask(with: request) {
(data, response, error) in
if let data = data {
if let postResponse = String(data: data, encoding: .utf8) {
print(postResponse)
}
}
}
task.resume()

Answer 1

Check with this:
func post method(){
let headers = [
"Content-Type": "application/json",
"cache-control": "no-cache"]
let parameters = ["set_id" : "20",
"user_id" : "30",
"type" : "contact",
"contact_name" : "shinto"] as [String : Any]
let postData = try? JSONSerialization.data(withJSONObject: parameters, options: [])
let url = URL(string: "****.php")!
var request = URLRequest(url: url)
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)
}
guard let httpresponse = response as? HTTPURLResponse,
(200...299).contains(httpresponse.statusCode) else {
print ("server error")
return
}
if let mimeType = response?.mimeType,
mimeType == "application/json",
let data = data,
let dataString = String(data: data, encoding: .utf8) {
print ("got data: \(dataString)")
}
}
})
dataTask.resume()
}

Answer 2

I used an online service called RequestBin to inspect your request and data seem to be sent correctly. I only did minor modifications as already mentioned in the comment.
This was the resulting code:
let json: [String: Any] = [
"set_id" : "20",
"user_id" : "30",
"type" : "contact",
"contact_name" : "shinto"
]
let jsonData = try! JSONSerialization.data(withJSONObject: json)
let url = URL(string: "http://requestbin.fullcontact.com/***")! // Was "using"
var request = URLRequest(url: url)
request.httpMethod = "POST" // Was "Post"
request.httpBody = jsonData // Was utf8 string representation
let session = URLSession(configuration: .default)
let task = session.dataTask(with: request) {
(data, response, error) in
if let data = data {
if let postResponse = String(data: data, encoding: .utf8) {
print(postResponse)
}
}
}
task.resume()
You can check inspected result using this service. You simply create a new URL and use it in your request. After you have successfully sent the request all you do is reload the page to inspect your request.
Note that these are "http" requests so you need to allow arbitrary loads.

Answer 3

You may set your request like following and change content type according to your need
import UIKit
let json: [String: Any]? = [
"set_id" : "20",
"user_id" : "30",
"type" : "contact",
"contact_name" : "shinto"
]
let url = URL(string: "****.php")!
var request = URLRequest(url: url)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
if let parameters = json
{
self.makeParamterString(request: request, parameterDic: parameters)
}
let session = URLSession(configuration: .default)
let task = session.dataTask(with: request) {
(data, response, error) in
if let data = data {
if let postResponse = String(data: data, encoding: .utf8) {
print(postResponse)
}
}
}
task.resume()
static func makeParamterString(request:NSMutableURLRequest, parameterDic:[String:AnyObject])
{
let _ = NSCharacterSet(charactersIn:"=\"#%/<>?#\\^`{|}").inverted
var dataString = String()
for (key, value) in parameterDic {
dataString = (dataString as String) + ("&\(key.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!)=\(value)")
}
dataString = dataString.addingPercentEncoding(withAllowedCharacters: NSCharacterSet.urlQueryAllowed)!
request.httpBody = dataString.data(using: String.Encoding.utf8)
}