Thanks. This bug is fixed in the latest revision
(https://github.com/yaoweibin/ngx_http_substitutions_filter_module)

2012/8/14 abstein2 <nginx-forum@nginx.us>:
> I have e-mailed Yao Weibin, but wanted to give an update here regarding
> my findings. It appears the issue is linked to long strings of text
> unbroken by a new line. With my settings, it appears that if a line
> contains ~40k bytes without being broken by a new line, something occurs
> whether gzip is on or off, that causes the gibberish to appear on the
> page.
>
> Thank you all for your input so far.
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,229545,229651#msg-229651
>
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