How to send data to server through headers using signalr_client flutter

I need some help ...I am using a flutter package signalr_client for real time web functionality to flutter app.So i want to send data to server either Http headers or query string . There is no option for signalr_client.

Solution

Finally I got answer. I sent timezone through query string by http:192.168.0.100/Chat?tmz=330'.And i get by calling context.Request.Query["tmz"]