This repository is a reference on how to start a Flutter project with a custom backend based on gRPC and Golang. It is (at least I believe so) not a spaghetti code, so it should be a great starter, and easy to extend.
It allows one to enter a query and send it with a request to the Golang backend server, which then performs it on Wikipedia to scrap information and return it as a result. All via gRPC.
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In order to make it work, you need to run Golang server go run cmd/app/main.go and then run Flutter app.
If you want to make changes to .proto file and regenerate the code, I created a small bash script that does it for you.
All you have to do is execute sh generate.sh from the proto directory.