Adding static http headers

[karthiga812]

Describe the bug
I'm trying to add static http headers to my API call like in the example.
@headers(<String, dynamic>{
'Content-Type': 'application/json',
'Custom-Header': 'Your header',
})
But I'm getting an error 'Annotation must be either a const variable reference or const constructor invocation.'
Can someone help?

Steps to reproduce the behavior:
Add static http headers to any API call like below,
@get('/api/endpoint')
@headers(<String, dynamic>{
'Content-Type': 'application/json',
'Custom-Header': 'Your header',
})

Expected behavior
The headers must be added to the API request and should get success response.

[geusan]

I've got same issue but i solved.

import 'package:retrofit/http.dart' as http;

@http.Headers({"Content-Type": "application/json"})

It is working.
I think there is same naming issue with dio package's Headers.