Mailing List Archive: Is there a way to force exit vcl

Is there a way to force exit vcl_recv?

Sep 11, 2017, 1:52 AM

Post #1 of 3 (520 views)

Hi,

We are trying to have varnish respond to all OPTIONS method requests. These
requests should not go to any backend. They should return the CORS headers
with an empty body, always (cors headers are added in vcl_deliver).

Our problem is that, because of the logic that follows in the config,
Varnish still ends up picking a backend and adding body, etc.

I would like to avoid adding everywhere 'if req.method != OPTIONS'..

Is there a way in vcl_recv to do something like this:

if (req.method ~ "(OPTIONS)"){
// dont pick backend, finish vcl_recv processing and jump directly to
vcl_deliver
}

?

Thanks!

Re: Is there a way to force exit vcl_recv? [ In reply to ]

dridi at varni

Sep 11, 2017, 2:43 AM

Post #2 of 3 (518 views)

Permalink

On Mon, Sep 11, 2017 at 10:52 AM, Eyal Marantenboim
<eyal.marantenboim@storecast.de> wrote:
> Hi,
>
> We are trying to have varnish respond to all OPTIONS method requests. These
> requests should not go to any backend. They should return the CORS headers
> with an empty body, always (cors headers are added in vcl_deliver).
>
> Our problem is that, because of the logic that follows in the config,
> Varnish still ends up picking a backend and adding body, etc.
>
> I would like to avoid adding everywhere 'if req.method != OPTIONS'..
>
> Is there a way in vcl_recv to do something like this:
>
> if (req.method ~ "(OPTIONS)"){
> // dont pick backend, finish vcl_recv processing and jump directly to
> vcl_deliver
> }
>
> ?
>
> Thanks!

Hi,

You are looking for synthetic responses:

sub vcl_recv {
if (req.method == "OPTIONS") {
return (synth(200));
}
}

sub vcl_synth {
if (req.method == "OPTIONS") {
# set the CORS response headers
return (deliver);
}
}

Dridi
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Re: Is there a way to force exit vcl_recv? [ In reply to ]

eyal.marantenboim at storecast

Sep 11, 2017, 4:35 AM

Post #3 of 3 (518 views)

Permalink

On 11. September 2017 at 11:44:27, Dridi Boukelmoune (dridi@varni.sh) wrote:

On Mon, Sep 11, 2017 at 10:52 AM, Eyal Marantenboim
<eyal.marantenboim@storecast.de> wrote:
> Hi,
>
> We are trying to have varnish respond to all OPTIONS method requests.
These
> requests should not go to any backend. They should return the CORS headers

> with an empty body, always (cors headers are added in vcl_deliver).
>
> Our problem is that, because of the logic that follows in the config,
> Varnish still ends up picking a backend and adding body, etc.
>
> I would like to avoid adding everywhere 'if req.method != OPTIONS'..
>
> Is there a way in vcl_recv to do something like this:
>
> if (req.method ~ "(OPTIONS)"){
> // dont pick backend, finish vcl_recv processing and jump directly to
> vcl_deliver
> }
>
> ?
>
> Thanks!

Hi,

You are looking for synthetic responses:

sub vcl_recv {
if (req.method == "OPTIONS") {
return (synth(200));
}
}

sub vcl_synth {
if (req.method == "OPTIONS") {
# set the CORS response headers
return (deliver);
}
}

Dridi

Exactly what I was looking for. Thanks!!