I ran through the tutorials at https://tutorials.cosmos.network/, which was fun. Some use Cosmos SDK 0.40, which have a different code generation approach than Cosmos SDK 0.39. I decided to do the first tutorial over using the new SDK and it looks like my module URL for the REST API - http://localhost:1317 is coming in as undefined. Here is the network tab from the browser: XHR GET http://0.0.0.0:1317/undefined/poll. My application is called voter, so perhaps I need to set a variable voter somewhere?
I didn't really change too much so it just has the basic app scaffolding with the poll type.
As of this moment, the "Voter" tutorial hasn't been updated to Cosmos SDK Stargate. You get an error because the form component in the component library has changed and instead of making a request to the "REST" API, makes a request to the gRPC HTTP gateway endpoint.
To get a list of polls from the frontend in the Stargate version of this tutorial, you can make a request to either :1317/voter/polls or :1317/alice/voter/voter/poll.