Dart - HttpRequest.getString() return JSON - json

Question

I am trying to return the raw JSON from my server path (I use rpc for the API) with a Closure, because I want to keep it in the same function instead of using .then() and calling another one.
This is my code:
GetEntryDiscussionsFromDb(){
var url = "http://localhost:8082/discussionApi/v1/getAllDiscussions";
getRawJson(String response){
return response;
}
HttpRequest.getString(url).then(getRawJson);
return getRawJson;
}
then in my main function I do this:
var getRawJson = GetEntryDiscussionsFromDb();
print(getRawJson());
By doing so I get this error:
G.GetEntryDiscussionsFromDb(...).call$0 is not a function
Did I use Closures wrong? Is there maybe a way to return the actual raw Json inside of .then() instead of calling another function?
Thanks in advance

Answer 1

Not sure what you try to accomplish. What is return getRawJson; supposed to do?
getRawJson just returns a reference to the getRawJson method. When you use getRawJson
print(getRawJson());
calls getRawJson without a parameter, but it expects String response. This is why you get the error message.
You can't avoid using then. Alternatively you can use async/await
GetEntryDiscussionsFromDb(){
var url = "http://localhost:8082/discussionApi/v1/getAllDiscussions";
getRawJson(String response){
return response;
}
return HttpRequest.getString(url).then(getRawJson);
}
main
GetEntryDiscussionsFromDb()
.then(print);
or
main() async {
...
var json = await GetEntryDiscussionsFromDb();
print(json);
}