net/url: issue with encoding spaces

by tech163@sliceone.com:

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. http://play.golang.org/p/Hal0slZDI9

What is the expected output?

Tue%%20Aug%%2028%%2013%%3A52%%3A20%%20UTC%%202012

What do you see instead?

Tue+Aug+28+13%%3A52%%3A20+UTC+2012

Which version are you using?  (run 'go version')

go version go1.0.2 (appengine-1.7.1)

Please provide any additional information below.

http://golang.org/pkg/net/url/ says "Package url parses URLs and implements query
escaping. See RFC 3986.", and spaces ' ' should be %%20 rather than +