njs and subrequests

[Antoine Bonavita]

Hello Valentin,

And thank you for your prompt answer. Writing such a http client and making
it available is probably a pretty big work. But if I were to write a
"limited" one that would fit my simple needs (GET only, only HTTP/1.1,
response in memory, etc.) trying to re-use what already exists in nginx
code base (asynchronous resolver comes to mind first), how should I proceed
? Which parts of the code should I start looking at/take as sample ?

Basically, I think I am asking what is the extension model of njs...

Thanks for your help,

Antoine.

On Sat, Nov 17, 2018 at 4:17 PM Valentin V. Bartenev <vbart at nginx.com>
wrote:

> On Saturday, 17 November 2018 17:06:12 MSK Antoine Bonavita wrote:
> > Hello,
> >
> > For a pet project of mine I'm trying to use njs to retrieve data from a
> > number of different sources (URLs really) and assemble them into one
> single
> > response. I tried to implement a proof of concept using subrequest (from
> > ngx_http_js_module) to do so. I quickly realized that it works only for
> > internal subrequests (i.e. not to external servers).
> >
> > I worked around this with the following location:
> >     location = /fwd-proxy {
> >         proxy_pass $arg_tgt;
> >     }
> >
> > We all know nginx is not really a forward proxy and this approach does
> not
> > seem very nice for the long term.
> >
> > So, I have a few cascading questions:
> > 1 - Is there any plan to have subrequest from ngx_http_js_module support
> > external URLs ?
> > 2 - If answer to 1 is no, is there any plan to have another official js
> > module implement it ?
> > 3 - If no, what would make most sense: implement it as a 3rd-party module
> > or completely move to something different (nginx Unit with Node.js comes
> to
> > mind) ? And why one rather than the other ?
> >
> > Thank you for reading so far and evne more thanks if you are kind enough
> to
> > hit the reply button.
> >
>
> Just to make it clear, "subrequest" is not a js module part.  It's a
> generic
> nginx mechanism used by many modules (including ssi, auth_request,
> addition)
> to request _internal_ resources.  The js module just provides you an API
> for this mechanism to make ssi-like subrequests.
>
> You're looking for a different thing, in fact you need an http client in
> the
> js module to request external resources.  That's not something provided
> right
> now, but will be nice to have in the future.
>
>   wbr, Valentin V. Bartenev
>
>
>
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