Varnish VCL JSONP support

jsonp.vcl

import urlplus;
import xbody;

sub vcl_backend_response {
	# Insert the JSONP callback
	if (urlplus.query_get("callback") && beresp.http.Content-Type ~ "json") {
		xbody.regsub("^", urlplus.query_get("callback") + "(");
		xbody.regsub("$", ");");
		set beresp.http.Content-Type = regsub(beresp.http.Content-Type, "json", "javascript");
	}
}