cURL to C# 変換ツール (.NET HttpClient, RestSharp & Flurl) 開発者ガイド

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using System.Text.Json;

using var client = new HttpClient();

using var request = new HttpRequestMessage(HttpMethod.Post, "https://api.openai.com/v1/chat/completions");

request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", "sk-proj-mockToken998877665544332211");

var jsonPayload = """
{
  "model": "gpt-4o",
  "messages": [
    {
      "role": "system",
      "content": "You are a professional C# and .NET full-stack architect."
    },
    {
      "role": "user",
      "content": "Demonstrate modern HttpClient and RestSharp best practices."
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1000
}
""";
request.Content = new StringContent(jsonPayload, Encoding.UTF8, "application/json");

try
{
    using var response = await client.SendAsync(request);
    response.EnsureSuccessStatusCode();
    var responseBody = await response.Content.ReadAsStringAsync();
    Console.WriteLine(responseBody);
}
catch (HttpRequestException ex)
{
    Console.WriteLine($"[HTTP Request Failed] {ex.StatusCode}: {ex.Message}");
}