Modifying POST data

[duebel13]

Using "Redirector-SSL", all HTTPS requests are replaced by a Proxo URL command prx/http://https.. When I save a bookmark in Diigo on secure pages, Diigo uses the original URL/Referer, not the fixed one (see the grey line starting with json=):



I think I can write a header filter to replace the URL command in the POST data, but how do I correct the Content-Length? I'm not aware of any method to do calculations in Proxomitron. Or can I just add some crap data to the post to match exactly 552 bytes?

A second, off-topic question would be: If I wanted to save the bookmark to delicio.us, too, how could I generate a second request?