Hi.

To perform rewrite, nginx does ngx_unescape_uri and then ngx_escape_uri to
pass request to backend. There is a problem with this functions: they both
can't handler "+" propertly: ngx_escape_uri does not escape «+» character

So when there is «%2b» sequence in rewrite command, it will be passed to
backend as «+» where it SHOULD be interpreted as space character.
I've attached a small patch that solved a problem for me.

For testing I used
location /foo {
rewrite (.*) $1 break;
proxy_pass http://localhost:1234;
}
+ while true; do nc -l -p 1234; done — to watch what is really send to
backend by nginx.

--
Regards,
Dmitry
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