Rails 6 and ngrok

Long time lurker, first time caller.

I just recently updated my failed payment application to Rails 6. Went to use Ngrok to test some webhoooks and got an interesting little error. Now, unless you specify a host in rails 6 everything except for localhost gets blocked. Great new security feature. Buuuut, what if I use ngrok regularly and don't have the paid version so I get a new address every time I run it? It's regex to the rescue.

Simply open config/environments/development.rb and then add config.hosts << /[a-z0-9]+\.ngrok\.io/super simple and awesome.

Thought I'd keep it short.

Have an awesome week.

Comments

[Chris Oliver]

You can also set config.hosts = nil to disable the feature if you want to let it accept all domains.

[Steve]

Ah yeah, didn't think of that.

[Chris Oliver]

Safer to do it your way. 😜

[Steve]

Haha, yeah.

[bran]

Thanks for the tip, but this regex doesn't cover all cases. I am using the below regex just to catch all possible hosts.

config.hosts << /.+\.ngrok\.io/

[Steve]

Yeah, I'm not regexpert so I'm sure there are spots that can be improved.

[Ben Halpern]

Thanks for the tip

[Steve]

Thanks for the forum to share said tip!

[Fareesh Vijayarangam]

If you are on a regional domain e.g. ap.ngrok.io you can change this to

config.hosts << /[a-z0-9]+\.ap.ngrok\.io/

[Breno da Mata]

Nice :)