Is it possible to send custom HTTP methods with HttpClient (C#)?

Yes, it is possible to send custom HTTP methods using HttpClient in C#. The HttpRequestMessage class allows you to specify any HTTP method you want, including custom methods, by setting the Method property with an instance of HttpMethod.

Here's an example of how to send a custom HTTP method using HttpClient:

using System;
using System.Net.Http;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        using var httpClient = new HttpClient();
        var request = new HttpRequestMessage();

        // Define your custom HTTP method
        request.Method = new HttpMethod("CUSTOM");

        // Set the request URL
        request.RequestUri = new Uri("http://example.com");

        try
        {
            // Send the request
            HttpResponseMessage response = await httpClient.SendAsync(request);

            // Check the response
            if (response.IsSuccessStatusCode)
            {
                string content = await response.Content.ReadAsStringAsync();
                Console.WriteLine(content);
            }
            else
            {
                Console.WriteLine($"Error: {response.StatusCode}");
            }
        }
        catch (HttpRequestException e)
        {
            Console.WriteLine($"Request exception: {e.Message}");
        }
    }
}

In this example, CUSTOM is the custom HTTP method. You can replace CUSTOM with your desired custom method name.

Please note that while HttpClient allows you to send custom HTTP methods, the server you're sending the request to must be configured to handle these methods. If the server does not support the custom method, it may return a 405 Method Not Allowed error or simply not respond in the expected manner.

Also, be aware that some intermediate network devices, such as proxies and firewalls, might not recognize or allow custom methods. This can lead to unexpected behavior or blocked requests, so it's important to ensure that the entire network path supports the custom methods you intend to use.