Pass proxy_url to download handler

Pass the value of proxy_url variable as optional 9th argument of download
handler.
Added support for http proxy to the example download handler script.
Updated README file.

1 files changed, 1 insertions, 0 deletions

diff --git a/README b/README
index b36293c..f9037c9 100644
--- a/README
+++ b/README
@@ -364,6 +364,7 @@ The script specific arguments are this:
 * download:
 
     $8 url of item to download
+    $9 url of http proxy (optional)
 
 * cookie handler