Duplicate sending of X-App-Version and X-App-Platform headers in SignalR client

[ysmoradi]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

The SignalR client in the bit Boilerplate template sends X-App-Version and X-App-Platform headers unneccesarily, because http client message handlers are already handling this.

Expected Behavior

Each header should be sent once per request.

Steps To Reproduce

Inspect outgoing SignalR requests for duplicate headers.

Exceptions (if any)

No response

.NET Version

No response

Anything else?

See parent issue #11512 and PR #11513 for more info.

[github-actions]

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