hlunn88:
520 error
Regarding Cloudflare 520 error, may I suggest you to try looking into below articles to troubleshoot the issue:
Error
Try the suggestions in this Community Tip to help you fix “Error 520 : Web server is returning an unknown error”.
Background
Error 520 is essentially a catch-all response when something unexpected happens or when the origin server incorrectly interprets or does not tolerate a request due to a protocol violation or an empty response. A 520 error occurs when the connection started on the origin web server, but that the request was not completed. The most common reason why this would occur …
https://support.cloudflare.com/hc/en-us/articles/115003011431-Troubleshooting-Cloudflare-5XX-errors#520error
hlunn88:
DNSSEC
May I ask was the DNSSEC enabled for your domain before you changed your nameservers to Cloudflare?
hlunn88:
HTTPS
Regarding Heroku and HTTPS, may I also ask did they provided you with an SSL certificate for your domain (covering both www and non-www) and was your Website working over HTTPS before moving to Cloudflare?
Kindly, check and post back here what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain? (Flexible, Full, Full Strict … )
Here is a way to re-check if you correctly setup the SSL for your domain with Cloudflare:
Get started with SSL/TLS · Cloudflare SSL/TLS docs
Archive This tutorial covers getting SSL working with Cloudflare in various different scenarios.
This assumes you already have your website set up on Cloudflare with all your DNS records set to
If any other issues appear, follow the needed steps for troubleshooting from article below:
Troubleshooting · Cloudflare SSL/TLS docs
Archive This tutorial post covers the steps you should take if you have enabled Cloudflare, but HTTPS is not working on the site.
If your main domain is secure, but a subdomain is not, please see <a href="https://community.cloudflare.com/t/ssl-tls-not-working-on-subdomain/75181.">https://community.cloudflare.com/t/ssl-tls-not-working-on-subdomain/75181.</a>
1. Check that the DNS record is se…
Regarding available SSL options at Cloudflare dashboard, check here:
Get started with SSL/TLS · Cloudflare SSL/TLS docs
Archive SSL/TLS Configuration Video:
This tutorial covers basic settings in the SSL/TLS app of the Cloudflare Dashboard, including SSL Mode [Off/Flexible/Full/Full (Strict)], Cloudflare Origin Certificates, ‘Always Use HTTPS’ and ‘Automatic HTTPS Rewrites’.
The settings covered here can all be found by visiting <a href="http://Cloudflare.com">Cloudflare.com</a>, logging in, selectin…
In case you do not have an SSL certificate, you can use Cloudflare SSL, if so, kindly make sure you follow the instructions as follows on the below article to setup an SSL certificate using Cloudflare CA Origin Certificate:
Last but not least, kindly have a look here for more information regarding correct SSL settings:
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That’s when th…
Few tips to check out for:
https://www.drivereasy.com/knowledge/fix-err-empty-response-on-google-chrome/
https://www.troubleshootingcentral.com/how-to-fix-err-empty-response-in-chrome/