Microsoft Bot Builder activity.text POST 到 webhook，REST 作为 JSON 有效负载答案

【问题标题】：Microsoft Bot Builder activity.text POST to webhook with REST as JSON payloadMicrosoft Bot Builder activity.text POST 到 webhook，REST 作为 JSON 有效负载
【发布时间】：2017-12-26 15:39:54
【问题描述】：

我想使用 Microsoft Bot Builder 创建一个机器人，它将接收到的消息发送到 webhook 端点。我尝试结合一些从搜索中找到的示例，但无济于事。我需要一些帮助才能将用户输入文本作为带有文本值的 json 有效负载发送到 webhook，这是我现在拥有的代码：

using System;
using System.Net;
using System.IO;
using System.Threading.Tasks;
using Microsoft.Bot.Builder.Dialogs;
using Microsoft.Bot.Connector;
using System.Web.Script.Serialization;

namespace Bot_Application1.Dialogs
{

    [Serializable]
    public class RootDialog : IDialog<object>
    {

        public Task StartAsync(IDialogContext context)
        {
            context.Wait(MessageReceivedAsync);

            return Task.CompletedTask;
        }

        private async Task MessageReceivedAsync(IDialogContext context, IAwaitable<object> result)
        {
            var activity = await result as Activity;

            // calculate something for us to return
            int length = (activity.Text ?? string.Empty).Length;

            // return our reply to the user
            await context.PostAsync($"You sent {activity.Text} which was {length} characters");

            // 
            var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://outlook.office.com/webhook/.../IncomingWebhook/.../...");
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Accept = "application/json";
            httpWebRequest.Method = "POST";

            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json = new JavaScriptSerializer().Serialize(new
                {
                    text = "\"" + activity.Text + "\""
                    });
                streamWriter.Write(json);
                streamWriter.Flush();
                streamWriter.Close();
            }
            //

            context.Wait(MessageReceivedAsync);
        }
    }
}

这是基于https://docs.microsoft.com/en-us/bot-framework/dotnet/bot-builder-dotnet-quickstart

当我在使用 Fiddler 进行监控时对此进行测试时，我可以看到机器人和客户端之间的通信，但看不到任何 REST http 请求。我不确定这是否是最好的方法，并且希望得到一些反馈。

到此端点的成功 POST 如下所示：

POST /webhook/.../IncomingWebhook/.../... HTTP/1.1
Host: outlook.office.com
User-Agent: insomnia/5.12.4
Content-Type: application/json
Accept: application/json
Content-Length: 26
{
    "text":"Hello world!"
}

感谢您的帮助！

【问题讨论】：

您正在形成请求，但最后没有发出请求。缺少代码(HttpWebResponse)httpWebRequest.GetResponse();。看看下面的答案。

标签： c# json rest bots botframework

【解决方案1】：

看起来您实际上并没有在最后提出请求。将代码更改为：

private async Task MessageReceivedAsync(IDialogContext context, IAwaitable<object> result)
    {
        var activity = await result as Activity;

        // calculate something for us to return
        int length = (activity.Text ?? string.Empty).Length;

        // return our reply to the user
        await context.PostAsync($"You sent {activity.Text} which was {length} characters");

        // 
        var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://outlook.office.com/webhook/.../IncomingWebhook/.../...");
        httpWebRequest.ContentType = "application/json";
        httpWebRequest.Accept = "application/json";
        httpWebRequest.Method = "POST";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string json = new JavaScriptSerializer().Serialize(new
            {
                text = "\"" + activity.Text + "\""
            });
            streamWriter.Write(json);
            streamWriter.Flush();
            streamWriter.Close();
        }
        //Make the actual request
        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            //Get the output
            var result = streamReader.ReadToEnd();
        }
        //

        context.Wait(MessageReceivedAsync);
    }

【讨论】：