using System;

using System.Net.Http   ;               

public class Program

{

    public static void Main()

    {

        var handler = new HttpClientHandler();

handler.UseCookies = false; 

​

using (var httpClient = new HttpClient(handler))

{

    using (var request = new HttpRequestMessage(new HttpMethod("POST"), "https://login.yahoo.com/account/module/create?validateField=yid"))

    {

        request.Headers.TryAddWithoutValidation("Connection", "keep-alive");

        request.Headers.TryAddWithoutValidation("Accept", "*/*");

        request.Headers.TryAddWithoutValidation("Accept-Encoding", "gzip, deflate, br");

        request.Headers.TryAddWithoutValidation("Accept-Language", "en-US,en;q=0.9");

        request.Headers.TryAddWithoutValidation("Referer", "https://login.yahoo.com/account/create?specId=yidReg^&altreg=usernameReg^&intl=us^&lang=en-US^&src=ym^&context=reg^&done=https^%^3A^%^2F^%^2Fmail.yahoo.com^%^2Fd");

        request.Headers.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36");

        request.Headers.TryAddWithoutValidation("Origin", "https://login.yahoo.com");

        request.Headers.TryAddWithoutValidation("X-Requested-With", "XMLHttpRequest");

        request.Headers.TryAddWithoutValidation("Cookie", "B=epvdsc5dueh6m^&b=3^&s=i2; GUCS=AWUZyqiw; GUC=AQEBAQFcqM5db0IkRAUE^&s=AQAAALU0Vr3B^&g=XKeGiA; AS=v=1^&s=uzSfKrxB^&d=D5ca8db81^|vrnMPO7.2cKoWG5MxCDZJLTmWG_G3GFMPWYI8X6ZZ0dhTTZEZWvciRVTSTydBL_i7orjlBd2p2q1GOrE0etIeWo4xTSHH16kEItbn.muIIoRNcWlVGKRETS9QXNsZsK3xnqbb9Fc9B9.uC_JSM2wfjAeZtJ8Rlr1oWHSsgHovJrBVcubVbC6CGhGTNQEKxHCvECib6d3ErKJAT8TIby5RLuPDL2ficY5be4yDmLdOQ.hsnFZrej.e11izdlt6AXIBpNuWMZMJggor1kibPiOKRC9XmKy22pxcI1ItW.K3LMicnC_jJI_v0pmO4VOuFHvgCahaZp75gg.vNwgDvhocUTdGUKTiQbeIQLm9YZBAzXL6jnabbhERtMfO0jQOZlqdN0BUE8D.WCxeX02iSpFR4.aFpssccmeOwe2TPCswxUB4lRifEI74FnTGbA6H.IhiVfp69kl5pkZVTRUXXr6U72or0UrYUwzrVrd80qCba87qp50IzdYKtsQP0i4qO41m.Z0o5QK.QXYMjF.lDdVq3L5CzMHU8Og362AS4W5icZWTiAVJZSSuSD2SFawuOT4HNu0WHAssJkMp1Xam4nP.YLRjIj9UM7eOqnUL97hiYdPo21GBT8xY0QR5pl9z8tWrwC59h9L0hXo6SA1j3IM6i9wLqH4xIAp86.v.vsqjm71VnIBSmP1F.728Va6SQ41mE6eoMMELuWYU9K4tJtyzoJU4W3yOawz485.uyOBIr81yiv4jXc-~A"); 

​

        request.Content = new StringContent("browser-fp-data=^%^7B^%^22language^%^22^%^3A^%^22en-US^%^22^%^2C^%^22color_depth^%^22^%^3A24^%^2C^%^22device_memory^%^22^%^3A8^%^2C^%^22hardware_concurrency^%^22^%^3A32^%^2C^%^22resolution^%^22^%^3A^%^7B^%^22w^%^22^%^3A1920^%^2C^%^22h^%^22^%^3A1080^%^7D^%^2C^%^22available_resolution^%^22^%^3A^%^7B^%^22w^%^22^%^3A1920^%^2C^%^22h^%^22^%^3A1040^%^7D^%^2C^%^22timezone_offset^%^22^%^3A-420^%^2C^%^22session_storage^%^22^%^3A1^%^2C^%^22local_storage^%^22^%^3A1^%^2C^%^22indexed_db^%^22^%^3A1^%^2C^%^22open_database^%^22^%^3A1^%^2C^%^22cpu_class^%^22^%^3A^%^22unknown^%^22^%^2C^%^22navigator_platform^%^22^%^3A^%^22Win32^%^22^%^2C^%^22canvas^%^22^%^3A^%^22canvas^%^20winding^%^3Ayes~canvas^%^22^%^2C^%^22webgl^%^22^%^3A1^%^2C^%^22webgl_vendor^%^22^%^3A^%^22Google^%^20Inc.~ANGLE^%^20(NVIDIA^%^20GeForce^%^20GTX^%^201050^%^20Ti^%^20Direct3D11^%^20vs_5_0^%^20ps_5_0)^%^22^%^2C^%^22adblock^%^22^%^3A1^%^2C^%^22has_lied_languages^%^22^%^3A0^%^2C^%^22has_lied_resolution^%^22^%^3A0^%^2C^%^22has_lied_os^%^22^%^3A0^%^2C^%^22has_lied_browser^%^22^%^3A0^%^2C^%^22touch_support^%^22^%^3A^%^7B^%^22points^%^22^%^3A0^%^2C^%^22event^%^22^%^3A0^%^2C^%^22start^%^22^%^3A0^%^7D^%^2C^%^22audio_fp^%^22^%^3A^%^22124.0434474653739^%^22^%^2C^%^22plugins^%^22^%^3A^%^7B^%^22count^%^22^%^3A3^%^2C^%^22hash^%^22^%^3A^%^22e43a8bc708fc490225cde0663b28278c^%^22^%^7D^%^2C^%^22fonts^%^22^%^3A^%^7B^%^22count^%^22^%^3A33^%^2C^%^22hash^%^22^%^3A^%^22edeefd360161b4bf944ac045e41d0b21^%^22^%^7D^%^2C^%^22ts^%^22^%^3A^%^7B^%^22serve^%^22^%^3A1554484038211^%^2C^%^22render^%^22^%^3A1554484038941^%^7D^%^7D^&specId=yidReg^&cacheStored=true^&crumb=p7Frd6oZDc6^&acrumb=uzSfKrxB^&sessionIndex=^&done=https^%^3A^%^2F^%^2Fmail.yahoo.com^%^2Fd^&googleIdToken=^&authCode=^&attrSetIndex=0^&tos0=oath_freereg^%^7Cus^%^7Cen-US^&firstName=^&lastName=^&yid=phuongtramvn1993^&password=^&shortCountryCode=US^&phone=^&mm=^&dd=^&yyyy=^&freeformGender=", Encoding.UTF8, "application/x-www-form-urlencoded"); 

​

        var response = await httpClient.SendAsync(request);

    }

}

    }

}