Command execution shouldn't occur when CORS allowed origin is not valid

[lucifercr07]

Steps to reproduce:

• Trigger command from UI with origin not part of configValue.Server.AllowedOrigins
• Command execution will still happen and response returned is not proper.

Expected output:

• Triggered command should fail with proper error response and no command execution

[mayank2424]

@lucifercr07 I would like to take this up. Could you please assign the issue to me?

[lucifercr07]

@mayank2424 assigned, thanks for contributing.

[mayank2424]

@mayank2424 assigned, thanks for contributing.

@lucifercr07 Here is a pull request for the changes - #61

[mayank2424]

Hey @lucifercr07, have you had a chance to review this PR?