HubConnection failed to start successfully because of error '{Invalid request method.toString()}

[maliaydemir]

I am using SignalR succesfully almost all phone. But I realized in Redmi Note7 (Android 10) it doesnt connect SignalR when celcular data is active. I couldun't find any solution therefore I am posting this issue. Maybe Redmi Note 7 phone has some security block. Does anyone get this error? By the way it is working on wifi on Redmi Note 7.

I used AWS ElasticBeanstalk on server side. Api and SignalR wrote with dotnet 5.

I/flutter ( 7123): SignalR log: Starting HubConnection. LogLevel.debug
I/flutter ( 7123): SignalR log: Starting connection with transfer format 'TransferFormat.text'. LogLevel.debug
I/flutter ( 7123): SignalR log: (WebSockets transport) Connecting. LogLevel.trace
I/flutter ( 7123): SignalR log: Failed to start the connection: Invalid request method LogLevel.error
I/flutter ( 7123): SignalR log: HubConnection failed to start successfully because of error '{Invalid request method.toString()}'. LogLevel.debug