add-mime-header
Returns a stream with added header key: value. This function does not remove an existing header with that key.
Signature
| add-mime-header(s:stream, key:string, value:string) -> stream | 
Parameters
| Name | Type | Description | 
|---|---|---|
| s | stream | The stream to which the header should be added. | 
| key | string | The key from the key-value pair. | 
| value | string | The value from the key-value pair. |