Send POST request using NSURLSession

Question

Update  Solution found  You can read it at the end of the post   I m trying to perform a POST request to a remote REST API using NSURLSession  The idea is to make a request with two parameters  deviceId and textContent   The problem is that those parameters are not recognized by the server  The server part works correctly because I ve sent a POST using POSTMAN for Google Chrome and it worked perfectly   This is the code I m using right now   NSString  deviceID     NSUserDefaults standardUserDefaults  objectForKey   deviceID    NSString  textContent     New note   NSString  noteDataString    NSString stringWithFormat   deviceId    amp textContent      deviceID  textContent    NSURLSessionConfiguration  sessionConfiguration    NSURLSessionConfiguration defaultSessionConfiguration   sessionConfiguration HTTPAdditionalHeaders                                                       api-key            API KEY                                                    Content-Type       application json                                                    NSURLSession  session    NSURLSession sessionWithConfiguration sessionConfiguration   NSURL  url    NSURL URLWithString   http   url to manage post requests    NSMutableURLRequest  request    NSMutableURLRequest requestWithURL url   request HTTPBody    noteDataString dataUsingEncoding NSUTF8StringEncoding   request HTTPMethod     POST   NSURLSessionDataTask  postDataTask    session dataTaskWithRequest request completionHandler   NSData  data  NSURLResponse  response  NSError  error           The server answers with an error because it doesn t receive the params      postDataTask resume     I ve tried the same procedure with a NSURLSessionUploadTask          NSURL  url    NSURL URLWithString   http   url to manage post requests    NSMutableURLRequest  request    NSMutableURLRequest requestWithURL url   request HTTPMethod     POST   NSURLSessionUploadTask  uploadTask    session uploadTaskWithRequest request fromData  noteDataString dataUsingEncoding NSUTF8StringEncoding  completionHandler   NSData  data  NSURLResponse  response  NSError  error           The server answers with an error because it doesn t receive the params      uploadTask resume     Any ideas   Solution  The problem with my approach was that I was sending the incorrect Content-Type header with all my requests  So the only change needed for the code to work correctly is to remove the Content-Type   application json HTTP header  So the correct code would be this   NSString  deviceID     NSUserDefaults standardUserDefaults  objectForKey   deviceID    NSString  textContent     New note   NSString  noteDataString    NSString stringWithFormat   deviceId    amp textContent      deviceID  textContent    NSURLSessionConfiguration  sessionConfiguration    NSURLSessionConfiguration defaultSessionConfiguration   sessionConfiguration HTTPAdditionalHeaders                                                       api-key            API KEY                                                    NSURLSession  session    NSURLSession sessionWithConfiguration sessionConfiguration   NSURL  url    NSURL URLWithString   http   url to manage post requests    NSMutableURLRequest  request    NSMutableURLRequest requestWithURL url   request HTTPBody    noteDataString dataUsingEncoding NSUTF8StringEncoding   request HTTPMethod     POST   NSURLSessionDataTask  postDataTask    session dataTaskWithRequest request completionHandler   NSData  data  NSURLResponse  response  NSError  error           The server answers with an error because it doesn t receive the params      postDataTask resume     Sending images along with other parameters  If you need to post images along with other parameters using NSURLSession here you have an example   NSString  deviceID     NSUserDefaults standardUserDefaults  objectForKey   deviceID    NSString  textContent     This is a new note       Build the request body NSString  boundary     SportuondoFormBoundary   NSMutableData  body    NSMutableData data      Body part for  deviceId  parameter  This is a string   body appendData   NSString stringWithFormat   --   r n   boundary  dataUsingEncoding NSUTF8StringEncoding     body appendData   NSString stringWithFormat   Content-Disposition  form-data  name        r n r n     deviceId   dataUsingEncoding NSUTF8StringEncoding     body appendData   NSString stringWithFormat      r n   deviceID  dataUsingEncoding NSUTF8StringEncoding       Body part for  textContent  parameter  This is a string   body appendData   NSString stringWithFormat   --   r n   boundary  dataUsingEncoding NSUTF8StringEncoding     body appendData   NSString stringWithFormat   Content-Disposition  form-data  name        r n r n     textContent   dataUsingEncoding NSUTF8StringEncoding     body appendData   NSString stringWithFormat      r n   textContent  dataUsingEncoding NSUTF8StringEncoding       Body part for the attachament  This is an image  NSData  imageData   UIImageJPEGRepresentation  UIImage imageNamed   ranking    0 6   if  imageData         body appendData   NSString stringWithFormat   --   r n   boundary  dataUsingEncoding NSUTF8StringEncoding         body appendData   NSString stringWithFormat   Content-Disposition  form-data  name         filename   image jpg   r n     image   dataUsingEncoding NSUTF8StringEncoding         body appendData    Content-Type  image jpeg r n r n  dataUsingEncoding NSUTF8StringEncoding         body appendData imageData        body appendData   NSString stringWithFormat    r n   dataUsingEncoding NSUTF8StringEncoding       body appendData   NSString stringWithFormat   --  -- r n   boundary  dataUsingEncoding NSUTF8StringEncoding        Setup the session NSURLSessionConfiguration  sessionConfiguration    NSURLSessionConfiguration defaultSessionConfiguration   sessionConfiguration HTTPAdditionalHeaders                                                       api-key            55e76dc4bbae25b066cb                                                    Accept             application json                                                    Content-Type      NSString stringWithFormat   multipart form-data  boundary      boundary                                                        Create the session    We can use the delegate to track upload progress NSURLSession  session    NSURLSession sessionWithConfiguration sessionConfiguration delegate self delegateQueue nil       Data uploading task  We could use NSURLSessionUploadTask instead of NSURLSessionDataTask if we needed to support uploads in the background NSURL  url    NSURL URLWithString   URL TO UPLOAD TO    NSMutableURLRequest  request    NSMutableURLRequest requestWithURL url   request HTTPMethod     POST   request HTTPBody   body  NSURLSessionDataTask  uploadTask    session dataTaskWithRequest request completionHandler   NSData  data  NSURLResponse  response  NSError  error           Process the response      uploadTask resume

User · Answer

use like this           Create file       import  lt Foundation Foundation h gt            import  SharedManager h       import  Constant h       import  UserDetails h        interface APISession   NSURLSession lt NSURLSessionDelegate gt       property  nonatomic  retain  NSMutableData  responseData        void postRequetsWithParam  NSMutableDictionary   objDic withAPIName  NSString        strAPIURL completionHandler  void     id result  BOOL status  completionHandler       end                   m                               import  APISession h       import  lt UIKit UIKit h gt       implementation APISession        void postRequetsWithParam  NSMutableDictionary   objDic withAPIName  NSString        strAPIURL completionHandler  void     id  BOOL  completionHandler           NSURL  url  NSURL URLWithString strAPIURL       NSMutableURLRequest  request   NSMutableURLRequest alloc initWithURL url        request setHTTPMethod   POST         request addValue   application json  forHTTPHeaderField   Content-Type        NSError  err   nil       NSData  data  NSJSONSerialization dataWithJSONObject objDic options NSJSONWritingPrettyPrinted error  amp err        request setHTTPBody data        NSString  strJsonFormat     NSString alloc  initWithData data encoding NSUTF8StringEncoding       NSLog   API URL      t  Api Request Parameter                   url strJsonFormat             NSLog   Request data       objDic       NSURLSessionConfiguration  defaultConfigObject    NSURLSessionConfiguration defaultSessionConfiguration       NSURLSession  session    NSURLSession sessionWithConfiguration  defaultConfigObject delegate  nil delegateQueue   NSOperationQueue mainQueue             NSURLSession  session  NSURLSession sharedSession        NSURLSessionTask  task  session dataTaskWithRequest request completionHandler   NSData    Nullable data  NSURLResponse    Nullable response  NSError    Nullable error                                                                if  error  nil                                        NSDictionary  dicData  NSJSONSerialization JSONObjectWithData data options NSJSONReadingAllowFragments error  amp error                                        NSLog   Response Data                 dicData                                       if   dicData valueForKey   tokenExpired  integerValue     1                                                                                 NSLog   hello                                            NSDictionary  dict    NSDictionary dictionaryWithObject   Access Token Expire   forKey   message                                              NSNotificationCenter defaultCenter  postNotificationName   UserLogOut  object self userInfo dict                                                                             dispatch async dispatch get main queue                                               completionHandler dicData  error    nil                                                                                NSLog       dicData                                                                     else                                      dispatch async dispatch get main queue                                               completionHandler error localizedDescription NO                                                                                                                       dispatch after dispatch time DISPATCH TIME NOW   int64 t  2 0   NSEC PER SEC    dispatch get main queue            task resume                            end                                   in  your view controller                 import  file      txtEmail text    txtEmail text stringByTrimmingCharactersInSet  NSCharacterSet whitespaceCharacterSet                        SVProgressHUD showWithStatus   Loading                    SVProgressHUD setDefaultMaskType SVProgressHUDMaskTypeGradient                NSMutableDictionary  objLoginDic   NSMutableDictionary alloc  init                objLoginDic setValue txtEmail text forKey   email                 objLoginDic setValue  0            forKey kDeviceType                objLoginDic setValue txtPassword text forKey kPassword                objLoginDic setValue   376545432   forKey kDeviceTokan                objLoginDic setValue               forKey kcountryId                objLoginDic setValue               forKey kfbAccessToken                objLoginDic setValue  0            forKey kloginType                 APISession postRequetsWithParam objLoginDic withAPIName KLOGIN URL completionHandler   id result  BOOL status                      SVProgressHUD dismiss                    NSInteger statusResponse   result valueForKey kStatus  integerValue                   NSString  strMessage  result valueForKey KMessage                   if  status                        if  statusResponse    1                                            UserDetails  objLoginUserDetail   UserDetails alloc                           initWithObject  result valueForKey   userDetails                                 NSUserDefaults standardUserDefaults                           setObject   objLoginUserDetail userId  forKey   user id                              NSUserDefaults standardUserDefaults  synchronize                            self clearTextfeilds                           HomeScreen  obj  Kiran Storyboard instantiateViewControllerWithIdentifier   HomeScreen                             self navigationController pushViewController obj animated YES                                             else                           strMessage showAsAlert self                                                                               use model class for represnt data                    import  lt Foundation Foundation h gt       import  Constant h       import  lt objc runtime h gt         interface UserDetails   NSObject      property strong nonatomic  NSString  emailId       deviceToken       countryId       fbAccessToken       accessToken       countryName       isProfileSetup       profilePic       firstName       lastName       password        property  assign  NSInteger userId deviceType loginType       - id initWithObject   NSDictionary   dicUserData      - void saveLoginUserDetail        UserDetails   getLoginUserDetail      - UserDetails   getEmptyModel      -  NSArray   allPropertyNames      - void printDescription         - NSMutableDictionary   getDictionary        end                        model m                    import  UserDetails h       import  SharedManager h        implementation UserDetails          - id initWithObject   NSDictionary   dicUserData                 self     UserDetails alloc  init          if  self                       try                   self setFirstName   dicUserData valueForKey   firstName       NSNull null                     dicUserData valueForKey   firstName                           self setUserId   dicUserData valueForKey kUserId      NSNull null                      dicUserData valueForKey kUserId  integerValue  0                               catch  NSException  exception                NSLog   Exception      exception description                      finally                       return self         - UserDetails   getEmptyModel       self setFirstName            self setLastName               self setDeviceType 0         return self                 -   void encodeWithCoder  NSCoder   encoder             Encode properties  other class variables  etc      encoder encodeObject  firstName forKey kFirstName          encoder encodeObject  NSNumber numberWithInteger  deviceType  forKey kDeviceType               -  id initWithCoder  NSCoder   decoder       if  self    super init               firstName    decoder decodeObjectForKey kEmailId             deviceType    decoder decodeObjectForKey kDeviceType  integerValue              return self            -  NSArray   allPropertyNames           unsigned count      objc property t  properties   class copyPropertyList  self class    amp count        NSMutableArray  rv    NSMutableArray array        unsigned i      for  i   0  i  lt  count  i                  objc property t property   properties i           NSString  name    NSString stringWithUTF8String property getName property             rv addObject name              free properties        return rv               - void printDescription      NSMutableDictionary  dic     NSMutableDictionary alloc  init        for NSString  key in  self allPropertyNames                  dic setValue  self valueForKey key  forKey key             NSLog    n                          User Detail                                n        NSLog        dic description        NSLog    n                                                              n              - NSMutableDictionary   getDictionary      NSMutableDictionary  dic     NSMutableDictionary alloc  init       for NSString  key in  self allPropertyNames                  dic setValue  self valueForKey key  forKey key             return dic             pragma mark      pragma mark - Save and get User details     - void saveLoginUserDetail      NSData  encodedObject    NSKeyedArchiver archivedDataWithRootObject self        Shared UserDefault setObject encodedObject forKey kUserDefault SavedUserDetail        Shared UserDefault synchronize                 UserDetails   getLoginUserDetail        NSData  encodedObject    Shared UserDefault objectForKey kUserDefault SavedUserDetail       UserDetails  object    NSKeyedUnarchiver unarchiveObjectWithData encodedObject       return object            end                                usefull code while add data into model and get data                             NSLog   Response     result                     NSString  strMessg    result objectForKey kMessage                    NSString  status    NSString stringWithFormat        result                  objectForKey kStatus                 if  status isEqualToString   1                                  arryBankList    NSMutableArray alloc init                    NSMutableArray  arrEvents  result valueForKey kbankList                   ShareOBJ isDefaultBank    result valueForKey kisDefaultBank                   if   arrEvents count  gt 0                                     for  NSMutableArray  dic in arrEvents                                                BankList  objBankListDetail    BankList alloc initWithObject  dic                           mutableCopy                             arryBankList addObject objBankListDetail                                      display data using model               BankList  objBankListing    arryBankList objectAtIndex indexPath row

User · Answer

Motivation  Sometimes I have been getting some errors when you want to pass httpBody serialized to Data from Dictionary  which on most cases is due to the wrong encoding or malformed data due to non NSCoding conforming objects in the Dictionary   Solution  Depending on your requirements one easy solution would be to create a String instead of Dictionary and convert it to Data  You have the code samples below written on Objective-C and Swift 3 0   Objective-C     Create the URLSession on the default configuration NSURLSessionConfiguration  defaultSessionConfiguration    NSURLSessionConfiguration defaultSessionConfiguration   NSURLSession  defaultSession    NSURLSession sessionWithConfiguration defaultSessionConfiguration       Setup the request with URL NSURL  url    NSURL URLWithString   yourURL    NSMutableURLRequest  urlRequest    NSMutableURLRequest requestWithURL url       Convert POST string parameters to data using UTF8 Encoding NSString  postParams     api key APIKEY amp email example example com amp password password   NSData  postData    postParams dataUsingEncoding NSUTF8StringEncoding       Convert POST string parameters to data using UTF8 Encoding  urlRequest setHTTPMethod   POST     urlRequest setHTTPBody postData       Create dataTask NSURLSessionDataTask  dataTask    defaultSession dataTaskWithRequest urlRequest completionHandler   NSData  data  NSURLResponse  response  NSError  error           Handle your response here         Fire the request  dataTask resume     Swift     Create the URLSession on the default configuration let defaultSessionConfiguration   URLSessionConfiguration default let defaultSession   URLSession configuration  defaultSessionConfiguration      Setup the request with URL let url   URL string   yourURL   var urlRequest   URLRequest url  url       Note  This is a demo  that s why I use implicitly unwrapped optional     Convert POST string parameters to data using UTF8 Encoding let postParams    api key APIKEY amp email example example com amp password password  let postData   postParams data using   utf8      Set the httpMethod and assign httpBody urlRequest httpMethod    POST  urlRequest httpBody   postData     Create dataTask let dataTask   defaultSession dataTask with  urlRequest     data  response  error  in        Handle your response here       Fire the request dataTask resume

User · Answer

You could try using a NSDictionary for the params  The following will send the parameters correctly to a JSON server   NSError  error   NSURLSessionConfiguration  configuration    NSURLSessionConfiguration defaultSessionConfiguration   NSURLSession  session    NSURLSession sessionWithConfiguration configuration delegate self delegateQueue nil   NSURL  url    NSURL URLWithString    JSON SERVER    NSMutableURLRequest  request    NSMutableURLRequest requestWithURL url                                                        cachePolicy NSURLRequestUseProtocolCachePolicy                                                    timeoutInterval 60 0     request addValue   application json  forHTTPHeaderField   Content-Type     request addValue   application json  forHTTPHeaderField   Accept      request setHTTPMethod   POST    NSDictionary  mapData     NSDictionary alloc  initWithObjectsAndKeys    TEST IOS     name                          IOS TYPE     typemap                        nil   NSData  postData    NSJSONSerialization dataWithJSONObject mapData options 0 error  amp error    request setHTTPBody postData     NSURLSessionDataTask  postDataTask    session dataTaskWithRequest request completionHandler   NSData  data  NSURLResponse  response  NSError  error           postDataTask resume     Hope this helps  I m trying to sort a CSRF authenticity issue with the above - but it does send the params in the NSDictionary

User · Answer

If you are using Swift  the Just library does this for you  Example from it s readme file       talk to registration end point 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

User · Answer

Teja Kumar Bethina s code changed for Swift 3       let urlStr    http   url to manage post requests      let url   URL string  urlStr       var request  URLRequest   URLRequest url  url        request httpMethod    POST       request setValue  application json   forHTTPHeaderField  Content-Type       request timeoutInterval   60 0        additional headers     request setValue  deviceIDValue   forHTTPHeaderField  DeviceId        let bodyStr    string or data to add to body of request      let bodyData   bodyStr data using  String Encoding utf8  allowLossyConversion  true      request httpBody   bodyData      let task   URLSession shared dataTask with  request             data  Data   response  URLResponse   error  Error   - gt  Void in          if let httpResponse   response as  HTTPURLResponse               print  responseCode   httpResponse statusCode                       if error    nil                   You can handle error response here             print    error              else                 Converting response to collection formate  array or dictionary              do                   let jsonResult    try JSONSerialization jsonObject with  data   options                      JSONSerialization ReadingOptions mutableContainers                      success code               catch                     failure code                                    task resume

User · Answer

You can use https   github com mxcl OMGHTTPURLRQ  id config    NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier someID   id session    NSURLSession sessionWithConfiguration config delegate someObject delegateQueue  NSOperationQueue new     OMGMultipartFormData  multipartFormData    OMGMultipartFormData new    multipartFormData addFile data1 parameterName   file1  filename   myimage1 png  contentType   image png     NSURLRequest  rq    OMGHTTPURLRQ POST url multipartFormData    id path     NSSearchPathForDirectoriesInDomains NSCachesDirectory  NSUserDomainMask  YES  lastObject  stringByAppendingPathComponent   upload NSData     rq HTTPBody writeToFile path atomically YES      session uploadTaskWithRequest rq fromFile  NSURL fileURLWithPath path   resume

User · Answer

Swift 2 0 solution is here    let urlStr      http   url to manage post requests      let url   NSURL string  urlStr    let request  NSMutableURLRequest    NSMutableURLRequest URL  url   request HTTPMethod    POST   request setValue    application json    forHTTPHeaderField    Content-Type      request timeoutInterval   60 0     additional headers  request setValue    deviceIDValue     forHTTPHeaderField    DeviceId       let bodyStr      string or data to add to body of request      let bodyData   bodyStr dataUsingEncoding NSUTF8StringEncoding  allowLossyConversion  true    request HTTPBody   bodyData   let session   NSURLSession sharedSession     let task   session dataTaskWithRequest request                 data  NSData   response  NSURLResponse   error  NSError   - gt  Void in               if let httpResponse   response as  NSHTTPURLResponse                   print  responseCode   httpResponse statusCode                                if error    nil                        You can handle error response here                  print    error                  else                       Converting response to collection formate  array or dictionary                   do                       let jsonResult  AnyObject    try NSJSONSerialization JSONObjectWithData data   options   NSJSONReadingOptions MutableContainers                           success code                   catch                         failure code                                                  task resume

[ios] Send POST request using NSURLSession

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