Imported Google Group message.
Date:Wednesday, 9 September 2015 11:32:50 UTC+1.
You can do this with jQuery, take a look at the ajax() method: http://api.jquery.com/jquery.ajax/ which allows you to control all elements of a request made to an API, you would need to set the headers or add a query parameter depending on your setup.
You'll need to set the "header" or query parameter information to an appropriate API token that Tyk can read.
I'd also recommend enabling the CORS features of the gateway to be a bit more secure.