Sending an HTTP POST request on iOS

Question

I m trying to send an HTTP Post with the iOS application that I m developing but the push never reaches the server although I do get a code 200 as response  from the urlconnection   I never get a response from the server nor does the server detect my posts  the server does detect posts coming from android   I do use ARC but have set pd and urlConnection as strong   This is my code for sending the request   NSMutableURLRequest  request     NSMutableURLRequest alloc                                      initWithURL  NSURL URLWithString  NSString stringWithFormat         dk baseURL   daantest           request setHTTPMethod   POST         request setValue   text xml     forHTTPHeaderField   Content-type         NSString  sendString      lt data gt  lt item gt Item 1 lt  item gt  lt item gt Item 2 lt  item gt  lt  data gt          request setValue  NSString stringWithFormat    d    sendString length   forHTTPHeaderField   Content-length          request setHTTPBody  sendString dataUsingEncoding NSUTF8StringEncoding        PushDelegate  pushd     PushDelegate alloc  init       pd   pushd      urlConnection     NSURLConnection alloc  initWithRequest request delegate pd        urlConnection start     this is my code for the delegate   import  PushDelegate h    implementation PushDelegate  synthesize data   - id  init       if self    super init                 data     NSMutableData alloc init            data setLength 0             return self      -  void connection  NSURLConnection   connection didWriteData  long long bytesWritten totalBytesWritten  long long totalBytesWritten       NSLog   didwriteData push      -  void connectionDidResumeDownloading  NSURLConnection   connection totalBytesWritten  long long totalBytesWritten expectedTotalBytes  long long expectedTotalBytes       NSLog   connectionDidResumeDownloading push       -  void connectionDidFinishDownloading  NSURLConnection   connection destinationURL  NSURL   destinationURL       NSLog   didfinish push  push     data      -  void connection  NSURLConnection   connection didSendBodyData  NSInteger bytesWritten totalBytesWritten  NSInteger totalBytesWritten totalBytesExpectedToWrite  NSInteger totalBytesExpectedToWrite       NSLog   did send body       -  void connection  NSURLConnection   connection didReceiveResponse  NSURLResponse   response        self data setLength 0       NSHTTPURLResponse  resp   NSHTTPURLResponse    response      NSLog   got response with status  push  d   resp statusCode       -  void connection  NSURLConnection   connection didReceiveData  NSData   d        self data appendData d        NSLog   recieved data  push      data      -  void connectionDidFinishLoading  NSURLConnection   connection       NSString  responseText     NSString alloc  initWithData self data encoding NSUTF8StringEncoding        NSLog   didfinishLoading    responseText       -  void connection  NSURLConnection   connection didFailWithError  NSError   error          UIAlertView alloc  initWithTitle NSLocalizedString   Error                                         message  error localizedDescription                                 delegate nil                       cancelButtonTitle NSLocalizedString   OK                              otherButtonTitles nil  show       NSLog   failed  amp push          Handle basic authentication challenge if needed -  void connection  NSURLConnection   connection didReceiveAuthenticationChallenge  NSURLAuthenticationChallenge   challenge       NSLog   credentials requested        NSString  username     username       NSString  password     password        NSURLCredential  credential    NSURLCredential credentialWithUser username                                                              password password                                                           persistence NSURLCredentialPersistenceForSession         challenge sender  useCredential credential forAuthenticationChallenge challenge       end   The console always prints the following lines and the following lines only   2013-04-01 20 35 04 341 ApprenticeXM 3423 907  did send body 2013-04-01 20 35 04 481 ApprenticeXM 3423 907  got response with status  push 200 2013-04-01 20 35 04 484 ApprenticeXM 3423 907  didfinish push  push  lt  gt

User · Accepted Answer

The following code describes a simple example using POST method.(How one can pass data by POST method)

Here, I describe how one can use of POST method.

1. Set post string with actual username and password.

NSString *post = [NSString stringWithFormat:@"Username=%@&Password=%@",@"username",@"password"];

2. Encode the post string using NSASCIIStringEncoding and also the post string you need to send in NSData format.

NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

You need to send the actual length of your data. Calculate the length of the post string.

NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];

3. Create a Urlrequest with all the properties like HTTP method, http header field with length of the post string. Create URLRequest object and initialize it.

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

Set the Url for which your going to send the data to that request.

[request setURL:[NSURL URLWithString:@"http://www.abcde.com/xyz/login.aspx"]];

Now, set HTTP method (POST or GET). Write this lines as it is in your code.

[request setHTTPMethod:@"POST"];

Set HTTP header field with length of the post data.

[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

Also set the Encoded value for HTTP header Field.

[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

Set the HTTPBody of the urlrequest with postData.

[request setHTTPBody:postData];

4. Now, create URLConnection object. Initialize it with the URLRequest.

NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];

It returns the initialized url connection and begins to load the data for the url request. You can check that whether you URL connection is done properly or not using just if/else statement as below.

if(conn) {
    NSLog(@"Connection Successful");
} else {
    NSLog(@"Connection could not be made");
}

5. To receive the data from the HTTP request , you can use the delegate methods provided by the URLConnection Class Reference. Delegate methods are as below.

// This method is used to receive the data which we get using post method.
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data

// This method receives the error report in case of connection is not made to server. 
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 

// This method is used to process the data after connection has made successfully.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection

Also Refer This and This documentation for POST method.

And here is best example with source code of HTTPPost Method.

User · Answer

Heres the method I used in my logging library  https   github com goktugyil QorumLogs  This method fills html forms inside Google Forms  Hope it helps someone using Swift   var url   NSURL string  urlstring   var request   NSMutableURLRequest URL  url   request HTTPMethod    POST  request setValue  application x-www-form-urlencoded  charset utf-8   forHTTPHeaderField   Content-Type   request HTTPBody   postData dataUsingEncoding NSUTF8StringEncoding  var connection   NSURLConnection request  request  delegate  nil  startImmediately  true

User · Answer

Objective C     Post API with parameters and validate with url to navigate if json   response key with status  success    NSString  string   NSString stringWithFormat   url uname    amp pass    amp uname submit Login  self txtUsername text self txtPassword text       NSLog       string       NSURL  url    NSURL URLWithString string       NSMutableURLRequest  request    NSMutableURLRequest requestWithURL url        request setHTTPMethod   POST        NSURLResponse  response      NSError  err      NSData  responseData    NSURLConnection sendSynchronousRequest request returningResponse  amp response error  amp err       NSLog   responseData       responseData       NSString  str     NSString alloc  initWithData responseData encoding NSUTF8StringEncoding       NSLog   responseData       str           NSDictionary  json    NSJSONSerialization JSONObjectWithData responseData                                                          options kNilOptions                                                            error nil       NSDictionary  latestLoans    json objectForKey   status        NSString  str2  NSString stringWithFormat        latestLoans       NSString  str3   success       if   str3 isEqualToString str2                   self performSegueWithIdentifier   move  sender nil           NSLog   successfully               else               UIAlertController  alert   UIAlertController                                  alertControllerWithTitle   Try Again                                   message   Username or Password is Incorrect                                    preferredStyle UIAlertControllerStyleAlert           UIAlertAction  ok    UIAlertAction actionWithTitle   OK  style UIAlertActionStyleDefault                                                    handler   UIAlertAction   action                                                           self view endEditing YES                                                                                                 alert addAction ok             UIView appearanceWhenContainedIn  UIAlertController class   nil  setTintColor  UIColor redColor             self presentViewController alert animated YES completion nil            self view endEditing YES             JSON Response     status   success   user id   58   user name   dilip   result   You have been logged in successfully        Working code

User · Answer

I am not really sure why  but as soon as I comment out the following method it works   connectionDidFinishDownloading destinationURL    Furthermore  I don t think you need the methods from the NSUrlConnectionDownloadDelegate protocol  only those from NSURLConnectionDataDelegate  unless you want some download information

User · Answer

Sending an HTTP POST request on iOS  Objective c    - NSString   postexample      SEND POST NSString  url    NSString stringWithFormat   URL    NSString  post    NSString stringWithFormat   param value    NSData  postData    post dataUsingEncoding NSASCIIStringEncoding allowLossyConversion YES   NSString  postLength    NSString stringWithFormat    d   postData length      NSMutableURLRequest  request     NSMutableURLRequest alloc  init    request setHTTPMethod   POST     request setURL  NSURL URLWithString url     request setValue postLength forHTTPHeaderField   Content-Length     request setValue   application x-www-form-urlencoded  forHTTPHeaderField   Content-Type     request setHTTPBody postData    NSError  error   nil  NSHTTPURLResponse  responseCode   nil     RESPONDE DATA  NSData  oResponseData    NSURLConnection sendSynchronousRequest request returningResponse  amp responseCode error  amp error    if  responseCode statusCode     200       NSLog   Error getting     HTTP status code  li   url   long  responseCode statusCode        return nil       SEE RESPONSE DATA UIAlertView  alert     UIAlertView alloc  initWithTitle   Response  message   NSString alloc  initWithData oResponseData encoding NSUTF8StringEncoding  delegate nil cancelButtonTitle   OK  otherButtonTitles  nil    alert show    return   NSString alloc  initWithData oResponseData encoding NSUTF8StringEncoding

User · Answer

- void sendingAnHTTPPOSTRequestOniOSWithUserEmailId   NSString   emailId withPassword   NSString   password    Init the NSURLSession with a configuration NSURLSessionConfiguration  defaultConfigObject    NSURLSessionConfiguration defaultSessionConfiguration   NSURLSession  defaultSession    NSURLSession sessionWithConfiguration  defaultConfigObject delegate  nil delegateQueue   NSOperationQueue mainQueue       Create an URLRequest NSURL  url    NSURL URLWithString   http   www example com apis login api    NSMutableURLRequest  urlRequest    NSMutableURLRequest requestWithURL url      Create POST Params and add it to HTTPBody NSString  params    NSString stringWithFormat   email    amp password     emailId password    urlRequest setHTTPMethod   POST     urlRequest setHTTPBody  params dataUsingEncoding NSUTF8StringEncoding       Create task NSURLSessionDataTask  dataTask    defaultSession dataTaskWithRequest urlRequest completionHandler   NSData  data  NSURLResponse  response  NSError  error          Handle your response here     NSDictionary  responseDict    NSJSONSerialization JSONObjectWithData data options NSJSONReadingAllowFragments error nil        NSLog       responseDict           dataTask resume

User · Answer

Using Swift 3 or 4 you can access these http request for sever communication      For POST data to request   func postAction        declare parameter as a dictionary which contains string as key and value combination  considering inputs are valid let parameters     id   13   name    jack   as  String   Any    create the url with URL let url   URL string   www requestURL php      change the url   create the session object let session   URLSession shared   now create the URLRequest object using the url object var request   URLRequest url  url  request httpMethod    POST    set http method as POST do       request httpBody   try JSONSerialization data withJSONObject  parameters  options   prettyPrinted     pass dictionary to nsdata object and set it as request body   catch let error       print error localizedDescription    request addValue  application json   forHTTPHeaderField   Content-Type   request addValue  application json   forHTTPHeaderField   Accept     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                 handle json                    catch let error           print error localizedDescription           task resume          For get the data from request  func GetRequest          let urlString   URL string   http   www requestURL php     change the url      if let url   urlString           let task   URLSession shared dataTask with  url     data  response  error  in             if error    nil                   print error                      else                   if let responceData   data                       print responceData    JSONSerialization                     do                             create json object from data                         if let json   try JSONSerialization jsonObject with responceData  options   mutableContainers  as   String  Any                                print json                                 handle json                                                    catch let error                           print error localizedDescription                                                                          task resume                For get the download content like image or video from request  func downloadTask             Create destination URL     let documentsUrl URL    FileManager default urls for   documentDirectory  in   userDomainMask  first as URL      let destinationFileUrl   documentsUrl appendingPathComponent  downloadedFile jpg         Create URL to the source file you want to download     let fileURL   URL string   http   placehold it 120x120 amp text image1       let sessionConfig   URLSessionConfiguration default     let session   URLSession configuration  sessionConfig      let request   URLRequest url fileURL        let task   session downloadTask with  request     tempLocalUrl  response  error  in         if let tempLocalUrl   tempLocalUrl  error    nil                  Success             if let statusCode    response as  HTTPURLResponse   statusCode                   print  Successfully downloaded  Status code    statusCode                               do                   try FileManager default copyItem at  tempLocalUrl  to  destinationFileUrl                catch  let writeError                    print  Error creating a file   destinationFileUrl      writeError                             else               print  Error took place while downloading a file  Error description       error  localizedDescription                             task resume

[ios] Sending an HTTP POST request on iOS

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