c# - 从 ASP.Net Web Api 获取数据时获取 403 状态

Question

我正在从 xamarin 表单应用程序中获取 WEB.API。在 .Net Web API 中创建的 Web API。但我收到错误

{StatusCode: 403, ReasonPhrase: 'ModSecurity Action', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Server: Microsoft-IIS/8.5
X-Powered-By: ASP.NET
X-Powered-By-Plesk: PleskWin
Date: Sat, 02 Sep 2017 07:59:38 GMT
Content-Type: text/html
Content-Length: 2684
}}

同样的 URL 也在浏览器和 postman 中提供了正确的输出。我正在使用下面的代码来获取 web api。我不知道到底发生了什么。

string RestUrl = "http://msystemtest.msystem.co/api/Users?userId={0}&pass={1}";

            var uri = new Uri(string.Format(RestUrl, uid, pass));
            string resp = string.Empty;

            var response = await client.GetAsync(uri);

            string statHold = string.Empty;
            if(response.IsSuccessStatusCode)
            {
                var content = await response.Content.ReadAsStringAsync();
                 resp = JsonConvert.DeserializeObject<string>(content);
            }

如果“http://msystemtest.msystem.co/api/Users?userId=test&pass=1”这个 URL 直接从浏览器和 postman 运行，它会给出正确的输出。

Answer 1

似乎服务器不喜欢您从非浏览器阅读此内容。这是从控制台应用程序模拟浏览器的代码:

using System;
using System.Net.Http;
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var httpClient = new HttpClient())
            {
                httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Accept", "application/json");
                httpClient.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0");

                var response = httpClient.GetAsync("http://msystemtest.msystem.co/api/Users?userId=test&pass=1").Result;
                Console.WriteLine(response.Content.ReadAsStringAsync().Result);
                Console.ReadKey();
            }
        }
    }
}