.net 核心 HTTPS 请求 returns 502 错误网关而 Postman returns 200 正常

Question

C#.NET core 3 中的这段代码有什么问题：

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var uriBuilder = new UriBuilder
            {
                Scheme = Uri.UriSchemeHttps,
                Host = "api.omniexplorer.info",
                Path = "v1/transaction/address",
            };

            var req = new Dictionary<string, string>
            {
                { "addr", "1FoWyxwPXuj4C6abqwhjDWdz6D4PZgYRjA" }
            };

            using(var httpClient = new HttpClient())
            {
                var response = await httpClient.PostAsync(uriBuilder.Uri, new StringContent(JsonConvert.SerializeObject(req)));
                response.EnsureSuccessStatusCode();
                Console.WriteLine(response.Content.ToString());
            }
        }
    }
}

当运行在行 response.EnsureSuccessStatusCode() 处设置断点时，我总是得到 502 响应。但是，如果运行这在 Postman 或 curl 中，我得到了一个有效的结果。

卷曲示例：

curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -d "addr=1EXoDusjGwvnjZUyKkxZ4UHEf77z6A5S4P" "https://api.omniexplorer.info/v1/transaction/address"

非常感谢您帮助新手！

Answer 1

请求使用 application/x-www-form-urlencoded，因此使用 FormUrlEncodedContent:

而不是 StringContent

var content = new FormUrlEncodedContent(req);
content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");

var response = await httpClient.PostAsync(uriBuilder.Uri, content);

.net 核心 HTTPS 请求 returns 502 错误网关而 Postman returns 200 正常

.net core HTTPS requests returns 502 bad gateway while Postman returns 200 OK

c#

https

post

dotnet-httpclient

.net-core