(I hope that "Private" checkbox does what I'm thinking. If author doesn't answer why didn't he submit the patch himself, I'll make this public).
I had problem with proxy that doesn't support HTTP/1.0, I googled and discovered that someone has already written a patch for it. I tried it, it works.
But it seems the author didn't post it here yet, I hope you'll excuse me for doing it for him.
His post with this patch is here: http://stephane.lesimple.fr/wiki/blog/proxytunnel_1.9.0_enhanced
But it doesn't open in my browser, I had to use Google cache: http://webcache.googleusercontent.com/search?q=cache:7jeDly3F16sJ:stephane.lesimple.fr/wiki/blog/proxytunnel_1.9.0_enhanced+&cd=1&hl=en&ct=clnk
The direct link for the patch is: http://stephane.lesimple.fr/wiki/_media/blog/proxytunnel-1.9.0-sl2.diff
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cmdline option for HTTP/1.1 support