Output.setHeader
Output.setHeader($name, $value, $options={}) -> null
Description
Set a response header.
If $options is -append, it will set the same header multiple times without overwriting the previous value.
Output.setHeader('X-App-Name', 'MyApp 2.0')
Output.setHeader('WWW-Authenticate', 'Negotiate')
Output.setHeader('WWW-Authenticate', 'NTLM', { append })