Whilst developing Jekyll sites locally, the Chrome browser will sometimes try to fetch the page over
https, rather than
http. This is problematic, because the browser just renders a protocol error:
This is caused by a security policy HSTS, or HTTP Strict Transport Security. We have to tell Chrome to forget that it wants to fetch localhost over a secure connection. To do this, visit chrome://net-internals/#hsts and find the field called Delete domain security policies. Enter
localhost:4000 (or whatever address you are using for the local jekyll server) and click delete. Chrome will now fetch the site over http again.
Once again, I am grateful to the responses over at Stack Overflow. If this doesn’t fix your problem then that’s the next place you should look.