HTTP Request in Swift with POST method

Question

I m trying to run a HTTP Request in Swift  to POST 2 parameters to a URL   Example   Link  www thisismylink com postName php  Params   id   13 name   Jack   What is the simplest way to do that   I don t even want to read the response  I just want to send that to perform changes on my database through a PHP file

User · Answer

For anyone looking for a clean way to encode a POST request in Swift 5.

You don’t need to deal with manually adding percent encoding. Use URLComponents to create a GET request URL. Then use query property of that URL to get properly percent escaped query string.

let url = URL(string: "https://example.com")!
var components = URLComponents(url: url, resolvingAgainstBaseURL: false)!

components.queryItems = [
    URLQueryItem(name: "key1", value: "NeedToEscape=And&"),
    URLQueryItem(name: "key2", value: "vålüé")
]

let query = components.url!.query

The query will be a properly escaped string:

key1=NeedToEscape%3DAnd%26&key2=v%C3%A5l%C3%BC%C3%A9

Now you can create a request and use the query as HTTPBody:

var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = Data(query.utf8)

Now you can send the request.

User · Answer

All the answers here use JSON objects  This gave us problems with the  this- gt input- gt post   methods of our Codeigniter controllers  The CI Controller cannot read JSON directly  We used this method to do it WITHOUT JSON func postRequest            Create url object     guard let url   URL string  yourURL  else  return          Create the session object     let session   URLSession shared         Create the URLRequest object using the url object     var request   URLRequest url  url          Set the request method  Important Do not set any other headers  like Content-Type     request httpMethod    quot POST quot    set http method as POST         Set parameters here  Replace with your own      let postData    quot param1 id param1 value amp param2 id param2 value quot  data using   utf8      request httpBody   postData         Create a task using the session object  to run and return completion handler     let webTask   session dataTask with  request  completionHandler   data  response  error in     guard error    nil else           print error  localizedDescription     quot Response Error quot           return           guard let serverData   data else           print  quot server data error quot           return           do           if let requestJson   try JSONSerialization jsonObject with  serverData  options   mutableContainers  as   String  Any               print  quot Response    requestJson  quot                   catch let responseError           print  quot Serialisation in error in creating response body    responseError localizedDescription  quot           let message   String bytes  serverData  encoding   ascii          print message as Any                Run the task     webTask resume      Now your CI Controller will be able to get param1 and param2 using  this- gt input- gt post  param1   and  this- gt input- gt post  param2

User · Answer

let session   URLSession shared         let url    http                 let request   NSMutableURLRequest url  NSURL string  url   as URL          request httpMethod    POST          request addValue  application json   forHTTPHeaderField   Content-Type           var params   String  Any           params     Some ID     111    REQUEST     SOME API NAME           do              request httpBody   try JSONSerialization data withJSONObject  params  options  JSONSerialization WritingOptions                let task   session dataTask with  request as URLRequest as URLRequest  completionHandler    data  response  error  in                 if let response   response                       let nsHTTPResponse   response as  HTTPURLResponse                     let statusCode   nsHTTPResponse statusCode                     print   status code     statusCode                                      if let error   error                       print     error                                      if let data   data                       do                          let jsonResponse   try JSONSerialization jsonObject with  data  options  JSONSerialization ReadingOptions                            print   data     jsonResponse                         catch                             print   OOps not good JSON formatted response                                                                      task resume            catch                 print   Oops something happened buddy

User · Answer

Swift 4 and above    IBAction func submitAction sender  UIButton           declare parameter as a dictionary which contains string as key and value combination  considering inputs are valid      let parameters     id   13   name    jack          create the url with URL     let url   URL string   www thisismylink com postName 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

User · Answer

In Swift 3 and later you can   let url   URL string   http   www thisismylink com postName php    var request   URLRequest url  url  request setValue  application x-www-form-urlencoded   forHTTPHeaderField   Content-Type   request httpMethod    POST  let parameters   String  Any           id   13       name    Jack  amp  Jill    request httpBody   parameters percentEncoded    let task   URLSession shared dataTask with  request    data  response  error in     guard let data   data           let response   response as  HTTPURLResponse           error    nil else                                                   check for fundamental networking error         print  error   error     Unknown error           return            guard  200     299     response statusCode else                         check for http errors         print  statusCode should be 2xx  but is   response statusCode            print  response     response            return            let responseString   String data  data  encoding   utf8      print  responseString     responseString       task resume     Where   extension Dictionary       func percentEncoded   - gt  Data            return map   key  value in             let escapedKey      key   addingPercentEncoding withAllowedCharacters   urlQueryValueAllowed                    let escapedValue      value   addingPercentEncoding withAllowedCharacters   urlQueryValueAllowed                    return escapedKey         escapedValue                    joined separator    amp             data using   utf8           extension CharacterSet        static let urlQueryValueAllowed  CharacterSet             let generalDelimitersToEncode              does not include     or     due to RFC 3986 - Section 3 4         let subDelimitersToEncode       amp                    var allowed   CharacterSet urlQueryAllowed         allowed remove charactersIn     generalDelimitersToEncode   subDelimitersToEncode            return allowed             This checks for both fundamental networking errors as well as high-level HTTP errors  This also properly percent escapes the parameters of the query    Note  I used a name of Jack  amp  Jill  to illustrate the proper x-www-form-urlencoded result of name Jack 20 26 20Jill  which is    percent encoded     i e  the space is replaced with  20 and the  amp  in the value is replaced with  26      See previous revision of this answer for Swift 2 rendition

User · Answer

Heres the method I used in my logging library  https   github com goktugyil QorumLogs  This method fills html forms inside Google Forms       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

IBAction func btn LogIn sender  AnyObject         let request   NSMutableURLRequest URL  NSURL string   http   demo hackerkernel com ios api login php         request HTTPMethod    POST      let postString    email  test test com  amp  password  testtest      request HTTPBody   postString dataUsingEncoding NSUTF8StringEncoding      let task   NSURLSession sharedSession   dataTaskWithRequest request  data  response  error in         guard error    nil  amp  amp  data    nil else              print  error               return                   if let httpStatus   response as  NSHTTPURLResponse where httpStatus statusCode    200              print  statusCode should be 200  but is   httpStatus statusCode                print  response     response                      let responseString   String data  data   encoding  NSUTF8StringEncoding          print  responseString     responseString              task resume

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