C＃中的Azure函数内容Webhook错误

Question

I'm having problems trying to obtain the http response from the contentful webhooks. I keep getting this error:

"The WebHook request contained invalid JSON: 'No MediaTypeFormatter is available to read an object of type 'JToken' from content with media type 'application/vnd.contentful.management.v1+json"

This is my function code:

#r "Newtonsoft.Json"


using System;
using System.Net;
using System.IO;
using System.Collections.Generic;
using Newtonsoft.Json;
using System.Net.Http.Headers;
using System.Net.Http.Formatting;
using System.Web.Http;


public static async Task<object> Run(HttpRequestMessage req, TraceWriter log)
{
  @json(body('formdataAction'));
  log.Info($"wjat");

  //    req.Headers.ContentType = new MediaTypeHeaderValue("application/json");

  log.Info($"Webhook was triggered!");
  string jsonContent = await req.Content.ReadAsStringAsync();
  // BodyParser.Of(BodyParser.TolerantJson.class);
  dynamic data = JsonConvert.DeserializeObject(jsonContent);

  log.Info(data.sys);

  if (data.first == null || data.last == null)
  {
    return req.CreateResponse(HttpStatusCode.BadRequest, new
    {
      error = "Please pass first/last properties in the input object"
    });
  }

  return req.CreateResponse(HttpStatusCode.OK, new
  {
      greeting = $"Hello {data.first} {data.last}!"
  });
}

Answer 1

The problem is that ReadAsAsync is trying to use the default media formatters which by default only allows application/json .

You could of course just register to use the json formatter for the contentful content type as well, but I'd suggest suggest using NewtonSoft.Json and doing something like this.

string json = await req.Content.ReadAsStringAsync();
dynamic data = JsonConvert.DeserializeObject(json);

Here is a complete function that works with a webhook from Contentful:

#r "Newtonsoft.Json"

using System.Net;
using Newtonsoft.Json;

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, 
 TraceWriter log)
{
    log.Info("C# HTTP trigger function processed a request.");

    // Get request body
    string json = await req.Content.ReadAsStringAsync();
    log.Info($"Read json: {json}");
     dynamic data = JsonConvert.DeserializeObject(json);

    string deserialized = data?.ToString();

    return req.CreateResponse(HttpStatusCode.OK, deserialized);
}