How can I send a GET request with JSON body?

Question

Is there any way at all that I can send a GET request with a JSON body using C#? I am making a call to an API to retrieve a list of items using a GET request, but I have to pass the customer_id in JSON. I am able to do this successfully in Postman and Python. However, the legacy app that I am working with is built as c# .NET winform. I am able to make other calls using HttpClient, but after some research I am finding that this class does not allow GET request with body except when using CORE. Are there any other alternatives?

Answer 1

According to Ian Kemp's answer to this question, This can be done in .NET Framework projects using the System.Net.Http.WinHttpHandler Library. (I'll just add the relevant part of the answer here, but I recommend to go check his full answer)

First, Install the System.Net.Http.WinHttpHandler Library from Nuget and then use it as your http client handler as described below:

var handler = new WinHttpHandler();
var client = new HttpClient(handler);
var request = new HttpRequestMessage
{
    Method = HttpMethod.Get,
    RequestUri = new Uri("some url"),
    Content = new StringContent("some json", Encoding.UTF8, ContentType.Json),
};

var response = await client.SendAsync(request).ConfigureAwait(false);
//Handle the response as you see fit