Adding custom header (om_http)

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Hi, According to this documentation I can use 'AddHeader' to put my custom headers to http request. However, when I put it in config i get: ERROR invalid keyword: AddHeader

I also tried

 Exec 				add_http_header('Application-Id', 'b1f8b7a0-5cc5-11e8-8230-0db3d3bfb10d');

This time error is: procedure 'add_http_header()' does not exist or takes different arguments.

What's the correct way to add a http header"?