iothub-errorcode：InvalidProtocolVersion

Question

将azure-iot-device sdk用于节点可在独立的节点程序中运行。当尝试在React Web应用程序中使用相同的节点代码时，与IoT中心的连接失败，出现以下错误：“ iothub-errorcode：InvalidProtocolVersion”：

stream.js:61 WebSocket connection to 'wss://my-iothub.azure-devices.net/' failed: Error during WebSocket handshake: Unexpected response code: 400

App.js

var Protocol = require('azure-iot-device-mqtt').Mqtt;
var Client = require('azure-iot-device').Client;

var connectionString = "HostName=my-iothub.azure-devices.net;DeviceId=<redacted>;SharedAccessKey=<redacted>=";
var client = Client.fromConnectionString(connectionString, Protocol);

var connectCallback = function (err) {
  if (err) {
    console.error('Could not connect: ' + err.message);
  }
  ...
};

client.open(connectCallback);

标题（来自Chrome开发者工具）

Request URL: wss://my-iothub.azure-devices.net/
Request Method: GET
Status Code: 400 Bad Request
Content-Length: 158
Content-Type: application/json; charset=utf-8
Date: Wed, 02 Oct 2019 21:18:10 GMT
iothub-errorcode: InvalidProtocolVersion
Server: Microsoft-HTTPAPI/2.0
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Cache-Control: no-cache
Connection: Upgrade
Host: my-iothub.azure-devices.net
Origin: http://localhost:3000
Pragma: no-cache
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
Sec-WebSocket-Key: <redacted>
Sec-WebSocket-Protocol: mqtt
Sec-WebSocket-Version: 13
Upgrade: websocket
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_0) 

可能与：https://github.com/Azure/azure-sdk-for-js/issues/3473#issuecomment-499719031] >>

将azure-iot-device sdk用于节点可在独立的节点程序中运行。当尝试在React Web应用程序中使用相同的节点代码时，与IoT中心的连接失败“ iothub-errorcode：...

Answer 1

我假设您正在尝试从Microsoft Azure中部署的React Web应用程序中利用IOT集线器，如果是这种情况，请尝试以下操作：