推荐订阅源

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Net;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        string appid = "983506039_qq_com_962b1aefc";
        string appkey = "2e0b9a8a2f357d2f2901055b290c185ad56196e714bb127d4a09e4b81b7c";

       // string jsonHeard = "{\"app_id\": \""+ appid+"\", \"app_key\": \""+ appkey+"\"}";
        string url = "https://api.mathpix.com/v3/text";

        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        request.Method = "POST";
        request.ContentType = "application/json"; 
        request.Headers.Set("app_id", appid);
        request.Headers.Set("app_key", appkey);

        string body = "{ \"src\":\"https://mathpix-ocr-examples.s3.amazonaws.com/cases_hw.jpg\", \"math_inline_delimiters\": [\"$\", \"$\"],  \"rm_spaces\": True}";

        body = "{ \"src\":\"http://www.dotnetcms.cn/1.png\", \"math_inline_delimiters\": [\"$\", \"$\"], \"math_display_delimiters\": [\"$$\", \"$$\"], \"rm_spaces\": \"true\"}";



        byte[] postBytes = null;
        postBytes = Encoding.UTF8.GetBytes(body);
        request.ContentLength = postBytes.Length;

        using (Stream reqStream = request.GetRequestStream())
        {
            reqStream.Write(postBytes, 0, postBytes.Length);
        }

        string result = string.Empty;

        using (WebResponse response = request.GetResponse())
        {
            if (response != null)
            {
                using (Stream stream = response.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                    {
                        result = reader.ReadToEnd();
                    }
                }

            }
        }

        Response.Write(result);

    }
}