Send a JSON request to another web site from C# code behind in an ASP.NET MVC project

Question

I'm working with ASP.NET MVC (backend being C#) and I'm trying to send a json that would look like this :

{
    "store_id": "store3",
    "api_token": "yesguy",
    "checkout_id": "UniqueNumber",
    "txn_total": "10.00",
    "environment": "qa",
    "action": "preload"
}

to another web site, suppose it's something like:

https://TestGate.paimon.com/chkt/request/request.php

Through some research I found this :

Send json to another server using asp.net core mvc c#

Looks good but I'm not working in core, my project is just normal ASP.NET MVC. I don't know how to use json functions to send it to a web site.

Here is what I tried (updated after inspired by Liad Dadon answer) :

public ActionResult Index(int idInsc)
{
    INSC_Inscription insc = GetMainModelInfos(idinsc);
    
    JsonModel jm = new JsonModel();
    jm.store_id = "store2";
    jm.api_token = "yesguy";
    jm.checkout_id = "uniqueId";
    jm.txn_total = "123.00";
    jm.environment = "qa";
    jm.action = "preload";

    var jsonObject = JsonConvert.SerializeObject(jm);
    var url = "https://gatewayt.whatever.com/chkt/request/request.php";
    HttpClient client = new HttpClient();
    var content = new StringContent(jsonObject, System.Text.Encoding.UTF8, "application/json");
    System.Threading.Tasks.Task<HttpResponseMessage> res = client.PostAsync(url, content);
    insc.response = res.Result; // This cause an exeption
    return View(insc);
}

When ths Json is posted correctly, the other web site will answer me with is own Json :

{
"response" : 
    {
        "success": "true",
        "ticket": "Another_Long_And_Unique_Id_From_The_Other_Web_Site"
    }
}

What I need to do is retreive this Json answer, once I have it, the rest is piece of cake.

Infos :

After the PostAsync function, var res contains this :

HttpClient class is the right API that you are looking for. See this link. learn.microsoft.com/en-us/dotnet/api/… — ibubi
– ibubi, Commented Mar 11, 2022 at 19:56
Yes this answers a good part of the question, thank you, it will allow me to send something to the other web site, the Json part though... — Antoine Pelletier
– Antoine Pelletier, Commented Mar 11, 2022 at 20:09
Expectation is the other web site is going to answer me with is own JSON that format will be like the code block before the last one. Maybe the order of my explanations is a bit confusing, i'll reformulate and also will add an image of res — Antoine Pelletier
– Antoine Pelletier, Commented Mar 14, 2022 at 19:28
@LiadDadon reformulated my question so the goal is clear, also added the content of res var — Antoine Pelletier
– Antoine Pelletier, Commented Mar 14, 2022 at 19:36

MD. RAKIB HASAN · Accepted Answer · 2022-03-15 09:37:35Z

1

+100

It looks like you might not be correctly handling an asynchronous task — the WaitingForActivation message you’re seeing, rather than being a response from our API, is in fact the status of your task. The task is waiting to be activated and scheduled internally by the .NET Framework infrastructure.
It seems you might need to await⁽²⁾ the task to ensure it completes or access the response with await client.PostAsync(url, content);. for adding await you need to add async to controller⁽¹⁾ action.

public  async Task<ActionResult> Index(int idInsc) //Change here [1]
{
    INSC_Inscription insc = GetMainModelInfos(idinsc);
    
    JsonModel jm = new JsonModel();
    jm.store_id = "store2";
    jm.api_token = "yesguy";
    jm.checkout_id = "uniqueId";
    jm.txn_total = "123.00";
    jm.environment = "qa";
    jm.action = "preload";

    var jsonObject = JsonConvert.SerializeObject(jm);
    var url = "https://gatewayt.whatever.com/chkt/request/request.php";
    HttpClient client = new HttpClient();
    var content = new StringContent(jsonObject, System.Text.Encoding.UTF8, "application/json");
    System.Threading.Tasks.Task<HttpResponseMessage> res = await client.PostAsync(url, content); //Change here [2]
    insc.response = res.Result; // This cause an exeption
    return View(insc);
}

edited Mar 15, 2022 at 9:37

answered Mar 15, 2022 at 9:15

MD. RAKIB HASAN

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8 Comments

Antoine Pelletier Over a year ago

Interesting, got an error message though : "Unable to create an SSL/TLS secure channel"

Antoine Pelletier Over a year ago

Probably a problem on my side, a matter of opening security a bit.

MD. RAKIB HASAN Over a year ago

it is another issue, mismatch between your client PC's configured cipher_suites values, and the values that the server is configured as being willing and able to accept. stackoverflow.com/questions/2859790/….

MD. RAKIB HASAN Over a year ago

@AntoinePelletier does this not solve your problem??

Antoine Pelletier Over a year ago

Since there has been some serious progress I would say this answer my specific question, still having trouble with tls/ssl secure canal but that's an other problem

|

learning · Accepted Answer · 2022-03-15 17:56:39Z

1

This is how I would post a JSON object to somewhere using Newtonsoft.Json package, HttpClient and StringContent classes:

using Newtonsoft.Json;

var object = new Model
{
  //your properties
}
var jsonObject = JsonConvert.SerializeObject(object);
var url = "http://yoururl.com/endpoint"; //<- your url here
try
{
   using HttpClient client = new();
   var content = new StringContent(jsonObject , Encoding.UTF8, 
   "application/json");
   var res = await client.PostAsync(url, content);
}

Please make sure your function is async and that you await the client.PostAsync fucntion.

edited Mar 15, 2022 at 17:56

answered Mar 11, 2022 at 20:37

learning

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2 Comments

Antoine Pelletier Over a year ago

I suppose I should replace act by object in your code, else where is act comming from ?

learning Over a year ago

Yes, my bad, forgot to replace it. Hope it will work for you :) Btw, the variable "res" is used for debugging and observing what is wrong in the http request you have just sent. You could debug and see what is the problem with the http request. (Please update on your progress)

Antoine Pelletier · Accepted Answer · 2023-01-17 19:12:07Z

0

If someone is wondering how I finally pulled it off (with other's help) here it is :

var url = "https://gatewayt.whatever.com/chkt/request/request.php";
HttpClient client = new HttpClient();
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
var content = new StringContent(jsonObject, System.Text.Encoding.UTF8, "application/json");
var res = await client.PostAsync(url, content);
var jsonRes = await res.Content.ReadAsStringAsync();

This line is important var jsonRes = await res.Content.ReadAsStringAsync(); the object jsonRes will be a string value, which is actually the response. The var res will only be the status of the response, not the actual response.

answered Jan 17, 2023 at 19:12

Antoine Pelletier

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