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Posted to users@httpd.apache.org by Antony Stone <An...@apache.open.source.it> on 2020/02/05 11:45:01 UTC
[users@httpd] Health check expressions
Hi.
I'm using Apache as a load-balancing proxy, following
https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html and
https://httpd.apache.org/docs/2.4/mod/mod_proxy_hcheck.html as guides to
setting it up.
I've got it working fine when I use %{REQUEST_STATUS} in the health check
expression, but I'd like to use the content type of the returned header for
the health check.
Following the "expression" link from the hcheck page and looking at
https://httpd.apache.org/docs/2.4/expr.html I think I should be able to use
%{CONTENT_TYPE} but this always returns status HcFl.
Is there a list of what I can use in ProxyHCExpr definitions somewhere, other
than the two examples (request status, and body content) shown on the above
page?
Any idea how to check the content-type of the returned response?
Thanks,
Antony.
--
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Engineers think "If it ain't broke, it doesn't have enough features yet".
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Re: [users@httpd] Health check expressions
Posted by Antony Stone <An...@apache.open.source.it>.
On Thursday 13 February 2020 at 13:38:40, Eric Covener wrote:
> On Thu, Feb 13, 2020 at 7:30 AM Antony Stone wrote:
> > On Thursday 13 February 2020 at 13:16:19, Eric Covener wrote:
> > > On Wed, Feb 5, 2020 at 6:45 AM Antony Stone wrote:
> > > >
> > > > Any idea how to check the content-type of the returned response?
> > >
> > > Have you tried reading the value of the Content-Type response header
> > > instead of this built-in var?
> >
> > No - how would I do that?
> >
> > What should I use for ProxyHCExpr to achieve this?
>
> Sorry I can't easily test it. you'd use the resp() function w/ that
> header as the parameter.
I'm still not quite sure what you mean, since
https://httpd.apache.org/docs/2.4/mod/mod_proxy_hcheck.html says nothing about
a resp() function, but I'll see whether
https://httpd.apache.org/docs/2.4/expr.html is enough to go on.
Regards,
Antony.
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Re: [users@httpd] Health check expressions
Posted by Eric Covener <co...@gmail.com>.
On Thu, Feb 13, 2020 at 7:30 AM Antony Stone
<An...@apache.open.source.it> wrote:
>
> On Thursday 13 February 2020 at 13:16:19, Eric Covener wrote:
>
> > On Wed, Feb 5, 2020 at 6:45 AM Antony Stone wrote:
> > > Hi.
> > >
> > > I'm using Apache as a load-balancing proxy, following
> > > https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html and
> > > https://httpd.apache.org/docs/2.4/mod/mod_proxy_hcheck.html as guides to
> > > setting it up.
> > >
> > > I've got it working fine when I use %{REQUEST_STATUS} in the health check
> > > expression, but I'd like to use the content type of the returned header
> > > for the health check.
> > >
> > > Following the "expression" link from the hcheck page and looking at
> > > https://httpd.apache.org/docs/2.4/expr.html I think I should be able to
> > > use %{CONTENT_TYPE} but this always returns status HcFl.
> > >
> > > Is there a list of what I can use in ProxyHCExpr definitions somewhere,
> > > other than the two examples (request status, and body content) shown on
> > > the above page?
> > >
> > > Any idea how to check the content-type of the returned response?
> >
> > Have you tried reading the value of the Content-Type response header
> > instead of this built-in var?
>
> No - how would I do that?
>
> What should I use for ProxyHCExpr to achieve this?
Sorry I can't easily test it. you'd use the resp() function w/ that
header as the parameter.
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Re: [users@httpd] Health check expressions
Posted by Antony Stone <An...@apache.open.source.it>.
On Thursday 13 February 2020 at 13:16:19, Eric Covener wrote:
> On Wed, Feb 5, 2020 at 6:45 AM Antony Stone wrote:
> > Hi.
> >
> > I'm using Apache as a load-balancing proxy, following
> > https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html and
> > https://httpd.apache.org/docs/2.4/mod/mod_proxy_hcheck.html as guides to
> > setting it up.
> >
> > I've got it working fine when I use %{REQUEST_STATUS} in the health check
> > expression, but I'd like to use the content type of the returned header
> > for the health check.
> >
> > Following the "expression" link from the hcheck page and looking at
> > https://httpd.apache.org/docs/2.4/expr.html I think I should be able to
> > use %{CONTENT_TYPE} but this always returns status HcFl.
> >
> > Is there a list of what I can use in ProxyHCExpr definitions somewhere,
> > other than the two examples (request status, and body content) shown on
> > the above page?
> >
> > Any idea how to check the content-type of the returned response?
>
> Have you tried reading the value of the Content-Type response header
> instead of this built-in var?
No - how would I do that?
What should I use for ProxyHCExpr to achieve this?
Thanks,
Antony.
--
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- Paul Davies, Professor of Theoretical Physics
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Re: [users@httpd] Health check expressions
Posted by Eric Covener <co...@gmail.com>.
On Wed, Feb 5, 2020 at 6:45 AM Antony Stone
<An...@apache.open.source.it> wrote:
>
> Hi.
>
> I'm using Apache as a load-balancing proxy, following
> https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html and
> https://httpd.apache.org/docs/2.4/mod/mod_proxy_hcheck.html as guides to
> setting it up.
>
> I've got it working fine when I use %{REQUEST_STATUS} in the health check
> expression, but I'd like to use the content type of the returned header for
> the health check.
>
> Following the "expression" link from the hcheck page and looking at
> https://httpd.apache.org/docs/2.4/expr.html I think I should be able to use
> %{CONTENT_TYPE} but this always returns status HcFl.
>
> Is there a list of what I can use in ProxyHCExpr definitions somewhere, other
> than the two examples (request status, and body content) shown on the above
> page?
>
> Any idea how to check the content-type of the returned response?
Have you tried reading the value of the Content-Type response header
instead of this built-in var?
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Re: [users@httpd] Health check expressions
Posted by Antony Stone <An...@apache.open.source.it>.
Does nobody have an idea about this?
Any suggestions where else I can ask (developer list etc)?
On Wednesday 05 February 2020 at 12:45:01, Antony Stone wrote:
> Hi.
>
> I'm using Apache as a load-balancing proxy, following
> https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html and
> https://httpd.apache.org/docs/2.4/mod/mod_proxy_hcheck.html as guides to
> setting it up.
>
> I've got it working fine when I use %{REQUEST_STATUS} in the health check
> expression, but I'd like to use the content type of the returned header for
> the health check.
>
> Following the "expression" link from the hcheck page and looking at
> https://httpd.apache.org/docs/2.4/expr.html I think I should be able to use
> %{CONTENT_TYPE} but this always returns status HcFl.
>
> Is there a list of what I can use in ProxyHCExpr definitions somewhere,
> other than the two examples (request status, and body content) shown on
> the above page?
>
> Any idea how to check the content-type of the returned response?
>
>
> Thanks,
>
>
> Antony.
--
2 days of trial and error can easily save you 5 minutes spent reading the
manual.
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