问题
I'm experiencing a 503 error with heroku on my project using WebSockets and a custom domain.
- Connecting on http://www.mydomain.com (That point with CNAME on my heroku app)
WebSocket connection to 'ws://www.mydomain.com/shoutbox' failed: Error during WebSocket handshake: Unexpected response code: 503
- Connecting on http://myapp.herokuapp.com
Everything goes allright with adress ws://myapp.herokuapp.com/shoutbox. Everything is also good in my local setup.
Is there any cross-domain issue I'm not aware off ? I'm using play!2 as server side fwk, but I don't think there is any relation to this problem.
[EDIT] If I can only connect within my own domain then it would be fine. Cause this would be the address I'd like people to use.
回答1:
I'm assuming you already enabled heroku labs:enable websockets since your herokuapp domain is working properly.
I have a hunch your DNS query is hitting a Heroku endpoint that doesn't support websockets, i.e. it's cached from before you enabled the websockets functionality.
If this behavior only happens on a single client, try flushing your DNS cache and trying again. Alternatively, make sure the DNS records for both of your domains are resolving to the same IP.
来源：https://stackoverflow.com/questions/23104517/heroku-error-503-websockets-on-multiple-domains