Send headers with JSONP

[cyberwombat]

How can I send custom header with JSONP? or how can I extend that if I need to add a headers entry - tried messing with the jsonp class with no success so far.

Basically I need to modify all my jsonp proxies to send wsse headers - there is another post on this but no solution for jsonp itself

Thanks for any direction

[mitchellsimoens]

The problem is JsonP is just a <script> tag