我有一个简单的应用程序，客户端通过 wss 连接在页面加载时发送加入 websocket 通道的请求。我已将我的应用程序部署到 domain 的 heroku my_app.heroku.com。每当我打开我的网站时，我都会收到错误消息Error in connection establishment: net::ERR_SSL_PROTOCOL_ERROR。我知道这是一个 SSL 问题，而且要使用 Heroku 的 SSL，您必须使用业余爱好者帐户。所以，我将应用程序升级为爱好者（一天前），但它并没有解决问题。
我已经用谷歌搜索了这个问题，从我看到的情况来看，除了升级到 Heroku Hobby 之外，似乎只有在使用自定义域名时才需要额外的设置，而我不是。如何my_app.heroku.com使用 Hobby dyno 让 SSL 在我的域上工作？
编辑：如果我跑步，curl -vI <my_app>.heroku_app.com我会得到以下信息：
curl -vI https://<my_app>.herokuapp.com
* Rebuilt URL to: https://<my_app>.herokuapp.com/
* Trying __.___.___.___...
* Connected to <my_app>.herokuapp.com (__.___.___.___) port 443
(#0)
* found 148 certificates in /etc/ssl/certs/ca-certificates.crt
* found 592 certificates in /etc/ssl/certs
* ALPN, offering http/1.1
* SSL connection using TLS1.2 / ECDHE_RSA_AES_128_GCM_SHA256
* server certificate verification OK
* server certificate status verification SKIPPED
* common name: *.herokuapp.com (matched)
* server certificate expiration date OK
* server certificate activation date OK
* certificate public key: RSA
* certificate version: #3
* subject: C=US,ST=California,L=San Francisco,O=Heroku\, Inc.,CN=*.herokuapp.com
* start date: Wed, 19 Apr 2017 00:00:00 GMT
* expire date: Mon, 22 Jun 2020 12:00:00 GMT
* issuer: C=US,O=DigiCert Inc,OU=www.digicert.com,CN=DigiCert SHA2
High Assurance Server CA
* compression: NULL
* ALPN, server did not agree to a protocol
> HEAD / HTTP/1.1
> Host: <my_app>.herokuapp.com
> User-Agent: curl/7.47.0
> Accept: */*
>
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< Server: Cowboy
Server: Cowboy
< Connection: keep-alive
Connection: keep-alive
< Content-Type: text/html; charset=utf-8
Content-Type: text/html; charset=utf-8
< Content-Length: 1154
Content-Length: 1154
< Date: Thu, 22 Nov 2018 08:39:51 GMT
Date: Thu, 22 Nov 2018 08:39:51 GMT
< Via: 1.1 vegur
Via: 1.1 vegur