How do I make an HTTP request in Swift

Question

I read The Programming Language Swift by Apple in iBooks  but cannot figure out how to make an HTTP request  something like cURL  in Swift  Do I need to import Obj-C classes or do I just need to import default libraries  Or is it not possible to make an HTTP request based on native Swift code

User · Answer

You can use Just  a python-requests style HTTP library   Some example of sending HTTP request with Just      synchronous GET request with URL query a 1 let r   Just get  https   httpbin org get   params   a  1       asynchronous POST request with form value and file uploads Just post       http   justiceleauge org member register       data    username    barryallen    password   ReverseF1ashSucks        files    profile photo    URL fileURLWithPath  flash jpeg   nil        r      if  r ok       success           In both cases  the result of a request r can be accessed in ways similar to python-request   r ok               is the response successful  r statusCode       status code of response r content          response body as NSData  r text             response body as text  r json             response body parsed by NSJSONSerielization   You can find more examples in this playground  Using this library in synchronous mode in a playground is the closest thing to cURL one can get in Swift

User · Answer

You can use URL  URLRequest and URLSession or NSURLConnection as you d normally do in Objective-C  Note that for iOS 7 0 and later  URLSession is preferred  Using URLSession Initialize a URL object and a URLSessionDataTask from URLSession  Then run the task with resume    let url   URL string   quot http   www stackoverflow com quot     let task   URLSession shared dataTask with  url    data  response  error  in     guard let data   data else   return       print String data  data  encoding   utf8       task resume    Using NSURLConnection First  initialize a URL and a URLRequest  let url   URL string   quot http   www stackoverflow com quot    var request   URLRequest url  url  request httpMethod    quot POST quot    Then  you can load the request asynchronously with  NSURLConnection sendAsynchronousRequest request  queue  OperationQueue main    response  data  error  in     guard let data   data else   return       print String data  data  encoding   utf8       Or you can initialize an NSURLConnection  let connection   NSURLConnection request  request  delegate nil  startImmediately  true   Just make sure to set your delegate to something other than nil and use the delegate methods to work with the response and data received  For more detail  check the documentation for the NSURLConnectionDataDelegate protocol Testing on an Xcode playground If you want to try this code on a Xcode playground  add import PlaygroundSupport to your playground  as well as the following call  PlaygroundPage current needsIndefiniteExecution   true  This will allow you to use asynchronous code in playgrounds

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var post NSString    api myposts amp userid   uid  amp page no 0 amp limit no 10       NSLog  PostData      post        var url1 NSURL   NSURL string  url        var postData NSData   post dataUsingEncoding NSASCIIStringEncoding        var postLength NSString   String  postData length        var request NSMutableURLRequest   NSMutableURLRequest URL  url1      request HTTPMethod    POST      request HTTPBody   postData     request setValue postLength  forHTTPHeaderField   Content-Length       request setValue  application x-www-form-urlencoded   forHTTPHeaderField   Content-Type       request setValue  application json   forHTTPHeaderField   Accept        var reponseError  NSError      var response  NSURLResponse       var urlData  NSData    NSURLConnection sendSynchronousRequest request  returningResponse  amp response  error  amp reponseError       if   urlData    nil             let res   response as NSHTTPURLResponse            NSLog  Response code   ld   res statusCode            if  res statusCode  gt   200  amp  amp  res statusCode  lt  300                        var responseData NSString    NSString data urlData   encoding NSUTF8StringEncoding                NSLog  Response    gt       responseData                var error  NSError               let jsonData NSDictionary   NSJSONSerialization JSONObjectWithData urlData   options NSJSONReadingOptions MutableContainers   error   amp error  as NSDictionary              let success NSInteger   jsonData valueForKey  error   as NSInteger                 jsonData   success   integerValue                NSLog  Success   ld   success                if success    0                                NSLog  Login SUCCESS                     self dataArr   jsonData valueForKey  data   as NSMutableArray                 self table reloadData                  else                    NSLog  Login failed1                    ZAActivityBar showErrorWithStatus  error   forAction   Action2                            else                NSLog  Login failed2                ZAActivityBar showErrorWithStatus  error   forAction   Action2                    else            NSLog  Login failed3            ZAActivityBar showErrorWithStatus  error   forAction   Action2       it will help you surely

User · Answer

For XCUITest to stop the test finishing before the async request completes use this  maybe reduce the 100 timeout    func test api         let url   URL string   https   jsonplaceholder typicode com posts 42        let exp   expectation description   Waiting for data       let task   URLSession shared dataTask with  url    data  response  error  in         guard let data   data else   return           print String data  data  encoding   utf8            exp fulfill             task resume       XCTWaiter wait for   exp   timeout  100

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Here s a very simple Swift 4 example in a playground   import UIKit    run asynchronously in a playground import PlaygroundSupport PlaygroundPage current needsIndefiniteExecution   true     create a url let url   URL string   http   www stackoverflow com       create a data task let task   URLSession shared dataTask with  url      data  response  error  in     if error    nil           print  there s a problem             print String data  data   encoding  String Encoding utf8              running the task w  resume task resume

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Swift 3 0 Through a small abstraction https   github com daltoniam swiftHTTP Example     do           let opt   try HTTP GET  quot https   google com quot           opt start   response in             if let err   response error                   print  quot error    err localizedDescription  quot                   return   also notify app of failure as needed                           print  quot opt finished    response description  quot                 print  quot data is    response data  quot   access the response of the data with response data                 catch let error           print  quot got an error creating the request    error  quot

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A simple Swift 2 0 approach to making a HTTP GET request  The HTTP request is asynchronous so you need a way to get the returned value from the HTTP Request  This approach uses Notifiers and is spread over two classes    The example is to check the username and password for an identifier token using the website http   www example com handler php do CheckUserJson amp json  That is the file is called handler php and has a switch statement on the do parameter to get a RESTful approach   In the viewDidLoad we setup the NotifierObserver  set up the json and make the call to the getHTTPRequest function  It will return to the function checkedUsernameAndPassword with the returned parameter from the http request   override func viewDidLoad         super viewDidLoad          setup the Notification observer to catch the result of check username and password     NSNotificationCenter defaultCenter   addObserver self  selector   checkedUsernameAndPassword    name  CHECK USERNAME AND PASSWORD  object  nil              let username   GlobalVariables USER NAME     let password   GlobalVariables PASSWORD        check username and password     if let jsonString   Utility checkUsernameAndPasswordJson username  password password           print  json string returned     jsonString            let url   CHECKUSERJSON jsonString            CHECKUSERJSON   http   www example com handler php do CheckUserJson amp json             jsonString      username     demo     password     demo                the php script handles a json request and returns a string identifier                    Utility getHTTPRequest url notifierId  CHECK USERNAME AND PASSWORD             the returned identifier is sent to the checkedUsernaeAndPassword function when it becomes availabel            There are two static functions in Utility swift first to encode the json and then to do the HTTP call       static func checkUsernameAndPasswordJson username  String  password  String  - gt  String       let para NSMutableDictionary   NSMutableDictionary           para setValue  demo   forKey   username           para setValue  demo   forKey   password       let jsonData  NSData     do          jsonData   try NSJSONSerialization dataWithJSONObject para  options  NSJSONWritingOptions            let jsonString   NSString data  jsonData  encoding  NSUTF8StringEncoding  as  String         return jsonString       catch             print   UH OOO           return nil           and the Http request      static func getHTTPRequest  url String   notifierId  String  - gt  Void      let urlString   url     let config   NSURLSessionConfiguration defaultSessionConfiguration       let session   NSURLSession configuration  config  delegate  nil  delegateQueue  nil      let safeURL   urlString stringByAddingPercentEncodingWithAllowedCharacters NSCharacterSet URLQueryAllowedCharacterSet         if let url   NSURL string  safeURL           let request    NSMutableURLRequest URL  url          request HTTPMethod    GET          request timeoutInterval   60         let taskData   session dataTaskWithRequest request  completionHandler                 data NSData   response NSURLResponse   error NSError   - gt  Void in             if  data    nil                    let result   NSString data  data    encoding  NSUTF8StringEncoding                  sendNotification  notifierId  message  String result   num  0               else                    sendNotification  notifierId  message  String UTF8String  nil   num  -1                                      taskData resume        else          print  bad urlString     urlString              The sendNotification function completes the circle  Notice that in teh Observer there is a     at the end of the selector string  This allows the notification to carry a payload in userInfo  I give this  a String and an Int       static func sendNotification  key  String  message String   num  Int        NSNotificationCenter defaultCenter   postNotificationName          key          object  nil          userInfo       message   message                          num      num                Note that using HTTP is oldFashioned  prefer HTTPS see How do I load an HTTP URL with App Transport Security enabled in iOS 9

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Details   Xcode 9 2  Swift 4 Xcode 10 2 1  10E1001   Swift 5    Info plist  NSAppTransportSecurity  Add to the info plist     lt key gt NSAppTransportSecurity lt  key gt   lt dict gt       lt key gt NSAllowsArbitraryLoads lt  key gt       lt true  gt   lt  dict gt      Alamofire Sample  Alamofire  import Alamofire  class AlamofireDataManager       fileprivate let queue  DispatchQueue     init queue  DispatchQueue    self queue   queue        private func createError message  String  code  Int  - gt  Error           return NSError domain   dataManager   code  code  userInfo    message   message               private func make session  URLSession   URLSession shared  request  URLRequest  closure    Result lt  String  Any  gt   - gt  Void              Alamofire request request  responseJSON   response in             let complete   Result lt  String  Any  gt   - gt        result in DispatchQueue main async   closure  result                  switch response result                   case  success let value   complete  success value as   String  Any                    case  failure let error   complete  failure error                                      func searchRequest term  String  closure    Result lt  String  Any  gt   - gt  Void              guard let url   URL string   https   itunes apple com search term   term replacingOccurrences of       with          else   return           let request   URLRequest url  url          make request  request    response in closure  response              Usage of Alamofire sample  private lazy var alamofireDataManager   AlamofireDataManager queue  DispatchQueue label   DataManager queue   qos   utility                alamofireDataManager searchRequest term   jack johnson     result in       print result value     no data         print result error     no error         URLSession Sample  import Foundation  class DataManager        fileprivate let queue  DispatchQueue         init queue  DispatchQueue    self queue   queue        private func createError message  String  code  Int  - gt  Error           return NSError domain   dataManager   code  code  userInfo    message   message               private func make session  URLSession   URLSession shared  request  URLRequest  closure      json   String  Any      error  Error  - gt Void              let task   session dataTask with  request     weak self  data  response  error in             self  queue async                   let complete     json   String  Any      error  Error   - gt        json  error in DispatchQueue main async   closure  json  error                       guard let self   self  error    nil else   complete nil  error   return                   guard let data   data else   complete nil  self createError message   No data   code  999    return                    do                       if let json   try JSONSerialization jsonObject with  data  options   mutableContainers  as   String  Any                            complete json  nil                                          catch let error   complete nil  error   return                                    task resume              func searchRequest term  String  closure      json   String  Any      error  Error  - gt Void              let url   URL string   https   itunes apple com search term   term replacingOccurrences of       with                  let request   URLRequest url  url           make request  request    json  error in closure  json  error              Usage of URLSession sample  private lazy var dataManager   DataManager queue  DispatchQueue label   DataManager queue   qos   utility              dataManager searchRequest term   jack johnson     json  error  in       print error     nil         print json     nil         print  Update views       Results

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Check Below Codes    1  SynchonousRequest  Swift 1 2      let urlPath  String    YOUR URL HERE      var url  NSURL   NSURL string  urlPath       var request1  NSURLRequest   NSURLRequest URL  url      var response  AutoreleasingUnsafeMutablePointer lt NSURLResponse  gt  nil     var dataVal  NSData    NSURLConnection sendSynchronousRequest request1  returningResponse  response  error nil       var err  NSError     println response      var jsonResult  NSDictionary   NSJSONSerialization JSONObjectWithData dataVal  options  NSJSONReadingOptions MutableContainers  error   amp err  as  NSDictionary     println  Synchronous  jsonResult      Swift 2 0    let urlPath  String    YOUR URL HERE      let url  NSURL   NSURL string  urlPath       let request1  NSURLRequest   NSURLRequest URL  url      let response  AutoreleasingUnsafeMutablePointer lt NSURLResponse  gt  nil       do           let dataVal   try NSURLConnection sendSynchronousRequest request1  returningResponse  response               print response              do                   if let jsonResult   try NSJSONSerialization JSONObjectWithData dataVal  options      as  NSDictionary                       print  Synchronous  jsonResult                                    catch let error as NSError                   print error localizedDescription                        catch let error as NSError                print error localizedDescription          2   AsynchonousRequest  Swift 1 2  let urlPath  String    YOUR URL HERE      var url  NSURL   NSURL string  urlPath       var request1  NSURLRequest   NSURLRequest URL  url      let queue NSOperationQueue   NSOperationQueue       NSURLConnection sendAsynchronousRequest request1  queue  queue  completionHandler    response  NSURLResponse   data  NSData   error  NSError   - gt  Void in         var err  NSError         var jsonResult  NSDictionary   NSJSONSerialization JSONObjectWithData data  options  NSJSONReadingOptions MutableContainers  error  nil  as NSDictionary         println  Asynchronous  jsonResult                Swift 2 0    let urlPath  String    YOUR URL HERE      let url  NSURL   NSURL string  urlPath       let request1  NSURLRequest   NSURLRequest URL  url      let queue NSOperationQueue   NSOperationQueue        NSURLConnection sendAsynchronousRequest request1  queue  queue  completionHandler    response  NSURLResponse   data  NSData   error  NSError   - gt  Void in          do               if let jsonResult   try NSJSONSerialization JSONObjectWithData data   options      as  NSDictionary                   print  ASynchronous  jsonResult                            catch let error as NSError               print error localizedDescription                       3  As usual URL connection  Swift 1 2      var dataVal   NSMutableData       let urlPath  String    YOUR URL HERE      var url  NSURL   NSURL string  urlPath       var request  NSURLRequest   NSURLRequest URL  url      var connection  NSURLConnection   NSURLConnection request  request  delegate  self  startImmediately  true       connection start     Then   func connection connection  NSURLConnection   didReceiveData data  NSData        self dataVal  appendData data      func connectionDidFinishLoading connection  NSURLConnection         var error  NSErrorPointer nil      var jsonResult  NSDictionary   NSJSONSerialization JSONObjectWithData dataVal   options  NSJSONReadingOptions MutableContainers  error  error  as NSDictionary      println jsonResult         Swift 2 0       var dataVal   NSMutableData       let urlPath  String    YOUR URL HERE      var url  NSURL   NSURL string  urlPath       var request  NSURLRequest   NSURLRequest URL  url      var connection  NSURLConnection   NSURLConnection request  request  delegate  self  startImmediately  true       connection start     Then  func connection connection  NSURLConnection   didReceiveData data  NSData        dataVal appendData data      func connectionDidFinishLoading connection  NSURLConnection          do           if let jsonResult   try NSJSONSerialization JSONObjectWithData dataVal  options      as  NSDictionary               print jsonResult                  catch let error as NSError           print error localizedDescription             4   Asynchonous POST Request  Swift 1 2      let urlPath  String    YOUR URL HERE      var url  NSURL   NSURL string  urlPath       var request1  NSMutableURLRequest   NSMutableURLRequest URL  url       request1 HTTPMethod    POST       var stringPost  deviceToken 123456     Key and Value      let data   stringPost dataUsingEncoding NSUTF8StringEncoding       request1 timeoutInterval   60     request1 HTTPBody data     request1 HTTPShouldHandleCookies false      let queue NSOperationQueue   NSOperationQueue         NSURLConnection sendAsynchronousRequest request1  queue  queue  completionHandler    response  NSURLResponse   data  NSData   error  NSError   - gt  Void in           var err  NSError          var jsonResult  NSDictionary   NSJSONSerialization JSONObjectWithData data  options  NSJSONReadingOptions MutableContainers  error  nil  as NSDictionary         println  AsSynchronous  jsonResult                   Swift 2 0    let urlPath  String    YOUR URL HERE      let url  NSURL   NSURL string  urlPath       let request1  NSMutableURLRequest   NSMutableURLRequest URL  url       request1 HTTPMethod    POST      let stringPost  deviceToken 123456     Key and Value      let data   stringPost dataUsingEncoding NSUTF8StringEncoding       request1 timeoutInterval   60     request1 HTTPBody data     request1 HTTPShouldHandleCookies false      let queue NSOperationQueue   NSOperationQueue        NSURLConnection sendAsynchronousRequest request1  queue  queue  completionHandler    response  NSURLResponse   data  NSData   error  NSError   - gt  Void in          do               if let jsonResult   try NSJSONSerialization JSONObjectWithData data   options      as  NSDictionary                   print  ASynchronous  jsonResult                            catch let error as NSError               print error localizedDescription                       5   Asynchonous GET Request  Swift 1 2      let urlPath  String    YOUR URL HERE      var url  NSURL   NSURL string  urlPath       var request1  NSMutableURLRequest   NSMutableURLRequest URL  url       request1 HTTPMethod    GET      request1 timeoutInterval   60     let queue NSOperationQueue   NSOperationQueue         NSURLConnection sendAsynchronousRequest request1  queue  queue  completionHandler    response  NSURLResponse   data  NSData   error  NSError   - gt  Void in           var err  NSError          var jsonResult  NSDictionary   NSJSONSerialization JSONObjectWithData data  options  NSJSONReadingOptions MutableContainers  error  nil  as NSDictionary         println  AsSynchronous  jsonResult                   Swift 2 0    let urlPath  String    YOUR URL HERE      let url  NSURL   NSURL string  urlPath       let request1  NSMutableURLRequest   NSMutableURLRequest URL  url       request1 HTTPMethod    GET      let queue NSOperationQueue   NSOperationQueue        NSURLConnection sendAsynchronousRequest request1  queue  queue  completionHandler    response  NSURLResponse   data  NSData   error  NSError   - gt  Void in          do               if let jsonResult   try NSJSONSerialization JSONObjectWithData data   options      as  NSDictionary                   print  ASynchronous  jsonResult                            catch let error as NSError               print error localizedDescription                       6  Image File  Upload  Swift 2 0      let mainURL    YOUR URL HERE       let url   NSURL string  mainURL      let request   NSMutableURLRequest URL  url       let boundary    78876565564454554547676      request addValue  multipart form-data  boundary   boundary    forHTTPHeaderField   Content-Type         request HTTPMethod    POST     POST OR PUT What you want     let session   NSURLSession configuration NSURLSessionConfiguration defaultSessionConfiguration    delegate  nil  delegateQueue  nil       let imageData   UIImageJPEGRepresentation UIImage named   Test jpeg     1           var body   NSMutableData        body appendData  --  boundary  r n  dataUsingEncoding NSUTF8StringEncoding            Append your parameters      body appendData  Content-Disposition  form-data  name   name   r n r n  dataUsingEncoding NSUTF8StringEncoding        body appendData  PREMKUMAR r n  dataUsingEncoding NSUTF8StringEncoding  allowLossyConversion  true        body appendData  --  boundary  r n  dataUsingEncoding NSUTF8StringEncoding         body appendData  Content-Disposition  form-data  name   description   r n r n  dataUsingEncoding NSUTF8StringEncoding        body appendData  IOS DEVELOPER r n  dataUsingEncoding NSUTF8StringEncoding  allowLossyConversion  true        body appendData  --  boundary  r n  dataUsingEncoding NSUTF8StringEncoding             Append your Image File Data      var imageNameval    HELLO jpg       body appendData  --  boundary  r n  dataUsingEncoding NSUTF8StringEncoding        body appendData  Content-Disposition  form-data  name   profile photo    filename     imageNameval    r n  dataUsingEncoding NSUTF8StringEncoding        body appendData  Content-Type  image jpeg r n r n  dataUsingEncoding NSUTF8StringEncoding        body appendData imageData       body appendData   r n  dataUsingEncoding NSUTF8StringEncoding         body appendData  --  boundary -- r n  dataUsingEncoding NSUTF8StringEncoding         request HTTPBody   body         let dataTask   session dataTaskWithRequest request     data  response  error  - gt  Void in          if error    nil                  handle error                     else                   let outputString   NSString   NSString data data   encoding NSUTF8StringEncoding               print  Response   outputString                          dataTask resume

User · Answer

Swift 4 and above   Data Request using URLSession API       create the url with NSURL    let url   URL string   https   jsonplaceholder typicode com todos 1      change the url       create the session object    let session   URLSession shared       now create the URLRequest object using the url object    let request   URLRequest url  url        create dataTask using the session object to send data to the server    let task   session dataTask with  request as URLRequest  completionHandler    data  response  error in         guard error    nil else              return                  guard let data   data else              return                 do              create json object from data          if let json   try JSONSerialization jsonObject with  data  options   mutableContainers  as   String  Any                print json                     catch let error           print error localizedDescription                    task resume     Swift 4 and above  Decodable and Result enum    APPError enum which shows all possible errors enum APPError  Error       case networkError Error      case dataNotFound     case jsonParsingError Error      case invalidStatusCode Int       Result enum to show success or failure enum Result lt T gt        case success T      case failure APPError       dataRequest which sends request to given URL and convert to Decodable Object func dataRequest lt T  Decodable gt  with url  String  objectType  T Type  completion   escaping  Result lt T gt   - gt  Void           create the url with NSURL     let dataURL   URL string  url     change the url        create the session object     let session   URLSession shared        now create the URLRequest object using the url object     let request   URLRequest url  dataURL  cachePolicy   useProtocolCachePolicy  timeoutInterval  60         create dataTask using the session object to send data to the server     let task   session dataTask with  request  completionHandler    data  response  error in          guard error    nil else               completion Result failure AppError networkError error                 return                    guard let data   data else               completion Result failure APPError dataNotFound               return                    do                 create decodable object from data             let decodedObject   try JSONDecoder   decode objectType self  from  data              completion Result success decodedObject             catch let error               completion Result failure APPError jsonParsingError error as  DecodingError                          task resume       example     if we want to fetch todo from placeholder API  then we define the ToDo struct and call dataRequest and pass  https   jsonplaceholder typicode com todos 1  string url   struct ToDo  Decodable       let id  Int     let userId  Int     let title  String     let completed  Bool     dataRequest with   https   jsonplaceholder typicode com todos 1   objectType  ToDo self     result  Result  in     switch result       case  success let object           print object      case  failure let error           print error              this prints the result   ToDo id  1  userId  1  title   delectus aut autem   completed  false

User · Answer

I have done HTTP Request Both methods GET  amp  POST with JSON Parsing this way   on viewDidLoad     override func viewDidLoad     super viewDidLoad        makeGetRequest       makePostRequest       func makePostRequest         let urlPath  String    http   www swiftdeveloperblog com http-post-example-script       var url  NSURL   NSURL string  urlPath       var request  NSMutableURLRequest   NSMutableURLRequest URL  url       request HTTPMethod    POST      var stringPost  firstName James amp lastName Bond     Key and Value      let data   stringPost dataUsingEncoding NSUTF8StringEncoding       request timeoutInterval   60     request HTTPBody data     request HTTPShouldHandleCookies false      let queue NSOperationQueue   NSOperationQueue        NSURLConnection sendAsynchronousRequest request  queue  NSOperationQueue    completionHandler    response NSURLResponse   data  NSData   error  NSError   - gt  Void in         var error  AutoreleasingUnsafeMutablePointer lt NSError  gt    nil         let jsonResult  NSDictionary    NSJSONSerialization JSONObjectWithData data  options NSJSONReadingOptions MutableContainers  error  error  as  NSDictionary           if  jsonResult    nil                   Success            println jsonResult              let message   jsonResult  Message   as  NSString             println message            else                  Failed             println  Failed                         func makeGetRequest        var url   String    http   api androidhive info contacts       var request   NSMutableURLRequest   NSMutableURLRequest       request URL   NSURL string  url      request HTTPMethod    GET      request timeoutInterval   60      NSURLConnection sendAsynchronousRequest request  queue  NSOperationQueue    completionHandler    response NSURLResponse   data  NSData   error  NSError   - gt  Void in         var error  AutoreleasingUnsafeMutablePointer lt NSError  gt    nil         let jsonResult  NSDictionary    NSJSONSerialization JSONObjectWithData data  options NSJSONReadingOptions MutableContainers  error  error  as  NSDictionary          if  jsonResult    nil                   Success             println jsonResult               let dataArray   jsonResult  contacts   as  NSArray               for item in dataArray      loop through data items                  let obj   item as  NSDictionary                  for  key  value  in obj                        println  Key    key  - Value    value                         let phone   obj  phone   as  NSDictionary                       let mobile   phone  mobile   as  NSString                     println mobile                      let home   phone  home   as  NSString                     println home                      let office   phone  office   as  NSString                     println office                                             else                  Failed             println  Failed                         Done

User · Answer

Using URLSession   Swift 5 Just adding to cezar s answer  if you want to make web request using Apple s URLSession class  there are multiple way to do the task  Simple GET Request with URL Simple GET Request with URL and Parameters Simple GET Request with URL with Error Handlings Simple POST Request with URL  Parameters with Error Handlings   1  Simple GET Request with URL func simpleGetUrlRequest                 let url   URL string   quot https   httpbin org get quot             let task   URLSession shared dataTask with  url    data  response  error  in             guard let data   data else   return               print  quot The response is    quot  String data  data  encoding   utf8                  print NSString data  data  encoding  String Encoding utf8 rawValue  as Any                    task resume           Note   Make sure You must add  quot NSAppTransportSecurity quot  key in pList for http requests   lt key gt NSAppTransportSecurity lt  key gt   lt dict gt   lt key gt NSAllowsArbitraryLoads lt  key gt   lt true  gt   lt  dict gt    2  Simple GET Request with URL and Parameters func simpleGetUrlWithParamRequest                 let url   URL string   quot https   www google com search q peace quot                     let task   URLSession shared dataTask with  url    data  response  error  in                          if error    nil    data    nil                   print  quot Client error  quot                   return                           guard let response   response as  HTTPURLResponse   200   299  contains response statusCode  else                   print  quot Server error  quot                   return                           print  quot The Response is    quot  response                    task resume           3  Simple GET Request with URL with Error Handlings func simpleGetUrlRequestWithErrorHandling                 let session   URLSession shared         let url   URL string   quot https   httpbin org get quot                     let task   session dataTask with  url    data  response  error in                          if error    nil    data    nil                   print  quot Client error  quot                   return                                        guard let response   response as  HTTPURLResponse   200   299  contains response statusCode  else                   print  quot Server error  quot                   return                                        guard let mime   response mimeType  mime     quot application json quot  else                   print  quot Wrong MIME type  quot                   return                                        do                   let json   try JSONSerialization jsonObject with  data   options                      print  quot The Response is    quot  json                catch                   print  quot JSON error    error localizedDescription  quot                                                task resume           4  Simple POST Request with URL  Parameters with Error Handlings  func simplePostRequestWithParamsAndErrorHandling            let configuration   URLSessionConfiguration default         configuration timeoutIntervalForRequest   30         configuration timeoutIntervalForResource   30         let session   URLSession configuration  configuration                   let url   URL string   quot https   httpbin org post quot                     var request   URLRequest url  url          request httpMethod    quot POST quot          request setValue  quot application json quot   forHTTPHeaderField   quot Content-Type quot           request addValue  quot application json quot   forHTTPHeaderField   quot Accept quot                    let parameters     quot username quot    quot foo quot    quot password quot    quot 123456 quot                    do               request httpBody   try JSONSerialization data withJSONObject  parameters  options   prettyPrinted            catch let error               print error localizedDescription                             let task   session dataTask with  request as URLRequest  completionHandler    data  response  error in                          if error    nil    data    nil                   print  quot Client error  quot                   return                                        guard let response   response as  HTTPURLResponse   200   299  contains response statusCode  else                   print  quot Oops   there is server error  quot                   return                                        guard let mime   response mimeType  mime     quot application json quot  else                   print  quot response is not json quot                   return                                        do                   let json   try JSONSerialization jsonObject with  data   options                      print  quot The Response is    quot  json                catch                   print  quot JSON error    error localizedDescription  quot                                                          task resume          Your suggestions are appreciated

User · Answer

KISS answer   URLSession shared dataTask with  URL string   https   google com       data  response  error  in     print String data  data   encoding   utf8     resume

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In Swift 4 1 and Xcode 9 4 1   JSON POST approach example  To check internet connection add Reachability h  amp   m files from https   developer apple com library archive samplecode Reachability Introduction Intro html   apple ref doc uid DTS40007324-Intro-DontLinkElementID 2  func yourFunctionName         Check internet connection     let networkReachability   Reachability forInternetConnection       let networkStatus Int    networkReachability  currentReachabilityStatus     rawValue     print networkStatus      if networkStatus    NotReachable rawValue           let msg   SharedClass sharedInstance noNetMsg  Message           Call alert from shared class         SharedClass sharedInstance alert view  self  title      message  msg        else             Call spinner from shared class         SharedClass sharedInstance activityIndicator view  self view   Play spinner          let parameters    Your parameters here          var request   URLRequest url  URL string  url             request setValue  application x-www-form-urlencoded   forHTTPHeaderField   Content-Type           request httpMethod    POST           print  URL     request             request httpBody   parameters 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               Stop spinner             SharedClass sharedInstance stopActivityIndicator     Stop spinner               Print error in alert             SharedClass sharedInstance alert view  self  title      message     String describing  error  localizedDescription                 return                            SharedClass sharedInstance stopActivityIndicator     Stop spinner              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                                do                   let response   try JSONSerialization jsonObject with  data  options      as   String  AnyObject                  print response                     Your code here                                   catch let error as NSError                   print error                                   task resume               If you have interest to use this function in SharedClass     My shared class import UIKit class SharedClass  NSObject    static let sharedInstance   SharedClass    func postRequestFunction apiName  String   parameters  String  onCompletion   escaping    success  Bool    error  Error     result   String  Any   - gt            var URL     your URL here index php            URL   URL replacingOccurrences of         with  apiName       var request   URLRequest url  URL string  URL        request setValue  application x-www-form-urlencoded   forHTTPHeaderField   Content-Type       request httpMethod    POST      print  shared URL     request        request httpBody   parameters data using   utf8       var returnRes  String Any            let task   URLSession shared dataTask with  request    data  response  error in          if let error   error               onCompletion false  error  nil            else               guard let data   data else                   onCompletion false  error  nil                  return                            if let httpStatus   response as  HTTPURLResponse  httpStatus statusCode    200                   do                      returnRes   try JSONSerialization jsonObject with  data  options      as   String   Any                      onCompletion true  nil  returnRes                     catch let error as NSError                      onCompletion false  error  nil                                  else                   onCompletion false  error  nil                                    task resume       private override init          And finally call this function like this      SharedClass sharedInstance postRequestFunction apiName   Your API name   parameters  parameters     success  error  result  in     print result       if success             Your code here       else           print error  localizedDescription

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I am calling the json on login button click    IBAction func loginClicked sender   AnyObject         var request   NSMutableURLRequest URL  NSURL string  kLoginURL      Here  kLogin contains the Login API       var session   NSURLSession sharedSession        request HTTPMethod    POST       var err  NSError      request HTTPBody   NSJSONSerialization dataWithJSONObject self criteriaDic    options  nil  error   amp err     This Line fills the web service with required parameters      request addValue  application json   forHTTPHeaderField   Content-Type       request addValue  application json   forHTTPHeaderField   Accept        var task   session dataTaskWithRequest request  completionHandler   data  response  error - gt  Void in         var strData   NSString data  data  encoding  NSUTF8StringEncoding          var err1  NSError          var json2   NSJSONSerialization JSONObjectWithData strData dataUsingEncoding NSUTF8StringEncoding   options   MutableLeaves  error  amp err1   as NSDictionary          println  json2    json2             if err                println err  localizedDescription                    else               var success   json2  success   as  Int             println  Success    success                          task resume       Here  I have made a seperate dictionary for the parameters   var params     format   json    MobileType   IOS   MIN   f8d16d98ad12acdbbe1de647414495ec   UserName  emailTxtField text  PWD  passwordTxtField text  SigninVia   SH  as NSDictionary     return params       You can add your own sets of parameter here

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An example for a sample  GET  request is given below       let urlString    YOUR GET URL  let yourURL   URL string  urlstring  let dataTask   URLSession shared dataTask with  yourURL     data  response  error  in do       let json   try JSONSerialization jsonObject with  data   options   mutableContainers      print  json ---   json         catch let err       print  err---  err localizedDescription               dataTask resume

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Basic Swift 3  Solution  guard let url   URL string   http   www stackoverflow com   else   return    let task   URLSession shared dataTask with  url    data  response  error in    guard let data   data  error    nil else   return      print NSString data  data  encoding  String Encoding utf8 rawValue      task resume

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Here is an example that worked for me     Swift function that post a request to a server with key values   func insertRecords            let usrID   txtID text     let checkin   lblInOut text     let comment   txtComment text           The address of the web service     let urlString    http   your url checkInOut post php          These are the keys that your are sending as part of the post request     let keyValues    id   usrID  amp inout   checkin  amp comment   comment              1 - Create the session by getting the configuration and then            creating the session      let config   NSURLSessionConfiguration defaultSessionConfiguration       let session   NSURLSession configuration  config  delegate  nil  delegateQueue  nil           2 - Create the URL Object      if let url   NSURL string  urlString                3 - Create the Request Object          var request    NSMutableURLRequest URL  url          request HTTPMethod    POST              set the key values         request HTTPBody   keyValues dataUsingEncoding NSUTF8StringEncoding                4 - execute the request          let taskData   session dataTaskWithRequest request  completionHandler                  data NSData   response NSURLResponse   error NSError   - gt  Void in              println    data                    5 - Do something with the Data back              if  data    nil                        we got some data back                 println    data                     let result   NSString data  data   encoding  NSUTF8StringEncoding                  println    result                     if result     OK                         let a   UIAlertView title   OK   message   Attendece has been recorded   delegate  nil  cancelButtonTitle   OK                        println    result                         dispatch async dispatch get main queue                            a show                                               else                        display error and do something else                                    else                     we got an error                 println  Error getting stores    error localizedDescription                                         taskData resume                  PHP Code to get the key values    empID     POST  id      inOut     POST  inout      comment     POST  comment

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Another option is the Alamofire lib that offers Chainable Request   Response methods   https   github com Alamofire Alamofire  Making a Request  import Alamofire  Alamofire request  GET   http   httpbin org get     Response Handling  Alamofire request  GET   http   httpbin org get   parameters    foo    bar              response   request  response  data  error in               print request                print response                print error

[ios] How do I make an HTTP request in Swift?

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