How to get applicationUrl from theme extension?

[Moonloon]

I am building an app that has a Block theme extension, and backend part.

I am using Remix app template.

When I run app with "shopify app dev" it starts my app with a Cloudflare proxy like pathology-repository-float-dts.trycloudflare.com (just an example)

My Block needs to make ajax requests to my backend remix server. 

But how can I know the URL if it is dynamically generated each time when I run "shopify app dev" ?

[MaverickStudio]

Hey @Moonloon,

Welcome to the community mate!

In that case use an ngrok tunnel url that will be static. Make sure to turn off the updates URL on dev option in your toml. Once you are ready for prod, just switch the urls and you're good to go.

Ngrok has a free tier that can be used by just signing up, it has limited egress of 1gb per month. 

[Sonya_2025 · Accepted solution]

Hi @Moonloon 

Welcome to Shopify Community.

You need using app Proxy to help you generate a fixed url address calling from your block. Please have a check.

Hope this helps.