How to send large POST parameters with URLSession

I am trying to create a class that allows me to send POST requests to a website whose content type is application / x-www-form-urlencoded. The code I am using is as follows:


import Foundation
class HTTPClient {


 func getStringResponse(url: String, method: String, charset: String, parametros: [String: Any], headers: [String: Any])->String{
 var htmlCode = ""

 connectionRequest(url: url, method: method, charset: charset, parametros: parametros, headers: headers, callback: {
  (data, error) in
  htmlCode = data
 })

 while htmlCode == "" {

 }

 return htmlCode
 }


func connectionRequest(url: String, method: String, charset: String, parametros: [String: Any], headers: [String: Any], callback: @escaping (String, String!) -> Void)
 {
  let myUrl = NSURL(string: url)
  let request = NSMutableURLRequest(url: myUrl! as URL)

 request.httpMethod = method

 if method == Constantes.METHOD_POST
 {
  var postString = ""

  for parametro in parametros
  {
  if postString.isEmpty
  {
  var cadena = parametro.key
  cadena.append("=")
  cadena.append(parametro.value as! String)
  postString.append(cadena)
  }
  else
  {
  var cadena = "&"
  cadena.append(parametro.key)
  cadena.append("=")
  cadena.append(parametro.value as! String)
  postString.append(cadena)
  }
  }


  var httpHeaders = [String: String]()
  httpHeaders["Cache-Control"] = "no-cache"
  httpHeaders["Content-Type"] = "application/x-www-form-urlencoded"

  for header in headers
  {
  httpHeaders[header.key] = header.value as! String
  }

  let encodeParameters: Data = postString.data(using: String.Encoding.utf8, allowLossyConversion: false)!
  let decodeParameters = String(data: encodeParameters, encoding: .utf8)

  request.allHTTPHeaderFields=httpHeaders
  request.httpBody = postString.data(using: String.Encoding.utf8, allowLossyConversion: false)

 }


  let task = URLSession.shared.dataTask(with: request as URLRequest) { data, response, error in
  if error == nil {
  let htmlCode = String(data: data!, encoding: .ascii)
  callback(htmlCode!, nil)
  return
  }
  }

 task.resume()
}


With this class if the parameter are simple, like "?name=One&surname=Two&city=City", this class works propertly. My problem is for large params. If I try to send next parameters it´s not working.


I can´t add the value of parameters, so I add the link of this question I posted on stackoverflow that include the parma values: https://stackoverflow.com/questions/58474729/how-to-send-large-post-parameters-with-urlsession


In my code, the variable decodeParameters have not the same value than postString after do the encode and decode process. Exists any limitation on the length of this type of parameters?

Up vote post of Diego Cid Down vote post of Diego Cid
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Diego Cid
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Accepted Reply

I have finally resolved the error. The problem was not in this class, which works perfectly, the problem was that the parameter that was received was not properly scraped to use as a parameter. So I has created this function to encode the parameters before call the class that I posted previously. func encodeParamenters(parametro: String) -> String { let allowedCharacterSet = (CharacterSet(charactersIn: "!*'();:@&=+$,/?%#[] ").inverted) let escapedString = parametro.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet) ?? "" return escapedString }

Posted by
Diego Cid
Up vote reply of Diego Cid Down vote reply of Diego Cid
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Reading the referenced post, it seems that your specific issue is that the 

decodeParameters
value doesn’t match the original 
postString
value. If so, I’m not able to reproduce this. Consider this code snippet: 
let postString = … from the referenced post …
let encodeParameters: Data = postString.data(using: String.Encoding.utf8, allowLossyConversion: false)!
let decodeParameters = String(data: encodeParameters, encoding: .utf8)
print(postString == decodeParameters)

On my machine this prints 

true
, indicating that the string survived the encode / decode process.

And, just to be super concrete about this, pasted in below is the full source of my test. Here I’ve encoded 

postString
value as hex in order to make DevForums happy.

In short, I’m not sure what your actual problem is, but I’m pretty sure that it’s not your encode / decode process.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware 

let myEmail = "eskimo" + "1" + "@apple.com"
import Foundation

let postStringHex = """
    6578636C 75646564 4964504C 6973743D 53746F72 6B26616C 6C6F774C 6567616C
    50657273 6F6E3D74 72756526 53414D4C 52657175 6573743D 50443934 62577767
    646D5679 63326C76 626A3069 4D533477 4969426C 626D4E76 5A476C75 5A7A3069
    56565247 4C546769 507A344B 50484E68 62577779 63447042 6458526F 626C4A6C
    6358566C 63335167 51584E7A 5A584A30 61573975 51323975 63335674 5A584A54
    5A584A32 61574E6C 56564A4D 50534A6F 64485277 637A6F76 4C334E6C 5A47566A
    62474632 5A53356B 5A335175 5A323969 4C6D567A 4F6A5130 4D793958 52554A66
    53566451 557A5666 53553546 56433971 63334176 59323975 59325679 64476C6D
    61574E68 5A473876 6157356B 5A586775 616E4E77 65434967 51323975 63325675
    64443069 64584A75 4F6D3968 63326C7A 4F6D3568 6257567A 4F6E526A 4F6C4E42
    54557736 4D693477 4F6D4E76 626E4E6C 626E5136 6457357A 6347566A 61575A70
    5A575169 4945526C 63335270 626D4630 61573975 50534A6F 64485277 637A6F76
    4C334E6C 4C584268 63324679 5A577868 4C6D4E73 59585A6C 4C6D6476 5969356C
    63793951 636D3934 65533954 5A584A32 61574E6C 55484A76 646D6C6B 5A584969
    49455A76 636D4E6C 51585630 61473439 496D5A68 62484E6C 4969424A 52443069
    58315178 61303155 5A323577 4D6B5533 516B7057 4E334E4D 4F584A4F 596A6C72
    56464E77 64445647 55575670 4969424A 63314268 63334E70 646D5539 496D5A68
    62484E6C 4969424A 63334E31 5A556C75 63335268 626E5139 496A4977 4D546B74
    4D544174 4D6A4255 4D6A4136 4E546B36 4D6A6B75 4D546B33 57694967 55484A76
    6447396A 62327843 6157356B 6157356E 50534A31 636D3436 6232467A 61584D36
    626D4674 5A584D36 64474D36 5530464E 54446F79 4C6A4136 596D6C75 5A476C75
    5A334D36 53465255 55433151 54314E55 49694251 636D3932 6157526C 636B3568
    62575539 496C4579 4F444532 4D44417A 52463946 4D444178 4D7A4131 4D444969
    49465A6C 636E4E70 62323439 496A4975 4D434967 65473173 626E4D36 63335276
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    """

extension String {

    func cluster(maxCount: Int) -> AnySequence<Substring> {
        return AnySequence(sequence(state: self.startIndex) { index -> Substring? in
            guard index != self.endIndex else {
                return nil
            }
            let base = index
            _ = self.formIndex(&index, offsetBy: maxCount, limitedBy: self.endIndex)
            return self[base..<index]
        })
    }
}

// let postStringOrig = … from the referenced post …
let postStringBytes = postStringHex
    .filter({!$0.isWhitespace})
    .cluster(maxCount: 2)
    .map { s -> UInt8 in
        precondition(s.count == 2)
        return UInt8(s, radix: 16)!
    }
let postString = String(bytes: postStringBytes, encoding: .utf8)!
// assert(postString == postStringOrig)
let encodeParameters: Data = postString.data(using: String.Encoding.utf8, allowLossyConversion: false)!
let decodeParameters = String(data: encodeParameters, encoding: .utf8)
print(postString == decodeParameters)
Posted by
eskimo
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Thank you very much for your answer. My main problem is that making the call to the web with the parameters of the form is returning an error due to incorrect parameters. As I commented in my post, other websites with simpler parameters are correctly configured, so he began to distrust the passing of parameters due to its length. What does not fit me is how the check is returning you a true one, when reviewing the values at runtime are the ones I have put in the related post. The truth is that I am a bit frustrated with the issue because it is something that should work without a problem and I do not understand how it could be causing problems.

Posted by
Diego Cid
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My main problem is that making the call to the web with the parameters of the form is returning an error due to incorrect parameters.

I strongly suspect that the parameters are not making it on the ‘wire’ the way that you think they are. I wrote up my some general advice on this topic in Debugging HTTP Server-Side Errors.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware 

let myEmail = "eskimo" + "1" + "@apple.com"
Posted by
eskimo
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Hi have review your post, and I have checked that the response code was 200, but in the body (html) there was a text that indicates that there was an error of validation. So my question now is if it´s possible that the system have sending the request two times. In this case of validation, the parameters only are valids one time.

Posted by
Diego Cid
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[is it] possible that the system have sending the request two times. In this case of validation, the parameters only are valids one time.

Certainly. There are various circumstances under which CFNetwork will retransmit requests. It shouldn’t retransmit a POST request (the HTTP RFCs make it very clear that POSTs are not idempotent) unless it’s sure that no part of the request made it to the server, but it’s always possible that something has gone wrong with that limiter.

If you’re concerned about this, you can rule it out using various debugging tools. Probably the easiest would be CFNetwork diagnostic logging.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware 

let myEmail = "eskimo" + "1" + "@apple.com"
Posted by
eskimo
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I have finally resolved the error. The problem was not in this class, which works perfectly, the problem was that the parameter that was received was not properly scraped to use as a parameter. So I has created this function to encode the parameters before call the class that I posted previously. func encodeParamenters(parametro: String) -> String { let allowedCharacterSet = (CharacterSet(charactersIn: "!*'();:@&=+$,/?%#[] ").inverted) let escapedString = parametro.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet) ?? "" return escapedString }

Posted by
Diego Cid
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