Running into the problems described here: Dfx 0.7.0-beta.2 does not allow ES modules , and I am trying to figure out how to get this all to work using a local http proxy for now. For a GET request, how does the replica know which canister to get the assets from? Inspecting some of the traffic, it se…

Best solution I’ve found is to use http://canisterId.localhost:8000 and to mostly develop on chrome, which supports localhost subdomains, or else to use Webpack dev server

Okay I think I figured it out, it’s got to be the Referer header. When I set that to the empty string I get a 500, and when I manually put a canisterId into it I don’t get 500 errors anymore. So ES modules are indeed unsupported currently with the v0.7.0 beta, since the Referer does not have the ca…

Sorry, late repsonse, but it’s not the referrer. Eventually it will be the Host (canister-id.ic0.app); for local development a query parameter ?canister_id=abcde-fgh is used.

I’m sorry, but are you sure it’s not the referer locally? Like I explained in my previous post, I get 500 errors when the referer header does not have the canisterId query parameter in it. The problem is, many requests locally do not have the canisterId query parameter anywhere in the headers that …

Or, I can’t square what you’re saying with what I’m seeing locally I guess. What am I doing wrong? I assume you would be able to replicate my issues locally

[image] lastmjs: My experiments locally do not match what you’re saying, so I have to disagree. That would be odd; I don’t see any code using the referrer in any component that could play a role here, and I never heard about this. Maybe the requests you are seeing without the url query param…

Cool, I’ll see if I can get more information

Looks like you were right and I was wrong, to some extend. In local development the proxy ran by dfx start will indeed look for the canister id in the following locations: Hostname Query string Referrer The latter two are only needed for local development where you can’t easily have separate hos…

Oh cool, yeah it’s no problem at all! Thanks for getting back to me on this

This seems to work for now, I’ll update this thread if there are any issues with using localhost subdomains.

How does replica know which canister to serve from

Developers

lastmjs May 20, 2021, 3:29pm 12

I think using localhost subdomains might be breaking update calls in development: Fail to verify certificate in development update calls

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How does replica know which canister to serve from

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