Cookies from an iframe are not stored

[buryni]

I charge my responsive web within an iframe. This iframe is loaded with a token and it login into webapp.

In header:

**Response**
:status: 200
Content-Type: text/html; charset=UTF-8
Pragma: no-cache
Access-Control-Allow-Credentials: true
Date: Wed, 04 Apr 2018 18:38:29 GMT
Cache-Control: no-store, no-cache, must-revalidate
Access-Control-Allow-Methods: GET, POST, OPTIONS
Server: nginx
Access-Control-Allow-Origin: *
Expires: Thu, 19 Nov 1981 08:52:00 GMT
**Set-Cookie: _PHPSESSID=5njgpr3a1sb6rbbdk255e4a8h5_; expires=Thu, 05-Apr-2018 18:38:29 GMT; Max-Age=86400; path=/**
Content-Encoding: gzip
Vary: Accept-Encoding
Access-Control-Allow-Headers: DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type

But that cookie is not stored, so I can never enter the webapp on iOS.

This does not happen with UIWebView.
This does not happen on android.
This does not happen in any pc/mac browser (included safari)

I have seen this solution:

https://stackoverflow.com/questions/26573137/can-i-set-the-cookies-to-be-used-by-a-wkwebview

But I do not know how to implement it in my ionic v.1

ionic info

cli packages: (/Users/XXXXXXXX)

    @ionic/cli-utils  : 1.19.2
    ionic (Ionic CLI) : 3.20.0

global packages:

    cordova (Cordova CLI) : 6.5.0 

local packages:

    Cordova Platforms : android 6.1.2 ios 4.3.1
    Ionic Framework   : ionic1 1.3.1

System:

    Android SDK Tools : 25.2.5
    ios-deploy        : 1.9.2 
    Node              : v8.9.1
    npm               : 2.15.12 
    OS                : macOS High Sierra
    Xcode             : Xcode 9.3 Build version 9E145 

Environment Variables:

    ANDROID_HOME : /Users/XXXXXX/Library/Android/sdk

Misc:

    backend : pro