url rewrite without nginx touching the string

david.birdsong · 2015-12-16T06:35:26+00:00

Hello! On Wed, Dec 16, 2015 at 3:00 PM, Lord Nynex wrote: > Personally, I'd love to understand how to generate a bytecode file and > compile it into n...

url rewrite without nginx touching the string

david.birdsong

We have a fairly robust c library that we expose via luajit for managing urls. This library takes care for performing url joins and proper encoding for each url element and is crucial to our business logic.

Is there a way to perform a ngx.req.set_uri and *not* have nginx touch the string, like at all?

I realize this might turn out to be an nginx question and not an openresty question, but I find this list to have more sophisticated discussion topics and responses.

agentzh

Hello!

On Tue, Dec 15, 2015 at 2:35 PM, David Birdsong wrote:
> Is there a way to perform a ngx.req.set_uri and *not* have nginx touch the
> string, like at all?
>

Could you elaborate and (better) give examples?

I don't really understand what you mean by "not having nginx touch the
string". Does nginx modify the strings set via ngx.req.set_uri() and
ngx.req.set_uri_args() in anyway undesired?

Best regards,
-agentzh

david.birdsong

On Tue, Dec 15, 2015 at 2:40 PM, Yichun Zhang (agentzh) <age...@gmail.com> wrote:

Hello!

On Tue, Dec 15, 2015 at 2:35 PM, David Birdsong wrote:
> Is there a way to perform a ngx.req.set_uri and *not* have nginx touch the
> string, like at all?
>

Could you elaborate and (better) give examples?

I don't really understand what you mean by "not having nginx touch the
string". Does nginx modify the strings set via ngx.req.set_uri() and
ngx.req.set_uri_args() in anyway undesired?

Best regards,
-agentzh

We had a case where a path "/path/foo/../bar" was being modified after ngx.req.set_uri w/ jump set to false. I can't recall if it was to "/path/bar" or "/path/foo/bar" but in the past, I've also noticed nginx rewrites url encode when we don't expect, so I figured the join collapsing and encoding were part of the rewrite phase. I can shut up for now and come back with something more concrete in the future if what I'm describing isn't sufficient to ask the question.

.

agentzh

Hello!

On Tue, Dec 15, 2015 at 2:52 PM, David Birdsong wrote:
> We had a case where a path "/path/foo/../bar" was being modified after
> ngx.req.set_uri w/ jump set to false. I can't recall if it was to
> "/path/bar" or "/path/foo/bar" but in the past, I've also noticed nginx
> rewrites url encode when we don't expect, so I figured the join collapsing
> and encoding were part of the rewrite phase. I can shut up for now and come
> back with something more concrete in the future if what I'm describing isn't
> sufficient to ask the question.
>

Yeah, a concrete and standalone test case can be very helpful for
discussing things :)

Best regards,
-agentzh