Re: Set header with value extracted from path
Baptiste,
This is exactly what I needed. I hadn't considered doing it in multiple
steps like this.
Thank you!
Ryan
On Thu, Dec 4, 2014 at 12:27 AM, Baptiste wrote:
> On Thu, Dec 4, 2014 at 12:09 AM, Ryan wrote:
> > When I received URL's with the following format:
> >
> > /1/a/b/c
> >
> > I rewrite the URL removing the digit like so:
> >
> > /v2.0.0/a/b/c
> >
> > And I need to set a header with the value of the digit I replaced, i.e.:
> >
> > X-ID: 1
> >
> > Is it possible to do this within haproxy? I am able to reqrep the
> original
> > url, and set an ACL to be used with an "http-request add-header"
> directive,
> > but I dont know how to extract the url value and either save it for use
> in
> > the add-header, or to write a format string in the add-header directive
> that
> > will do this.
> >
> > I'm playing around with something like this but not having much luck:
> >
> > acl url_id path_reg ^/([0-9]+)/.*$
> > http-request add-header X_ID %[path_reg(^/([0-9]+)/.*$)] if url_id
> >
> > Any ideas?
> >
> > Thanks,
> > Ryan
>
>
>
> Hi Rian,
>
> Either there is a bug in the code or the documentation is inacurate,
> in chapter 7.3.6 HTTP samples.
> The document says we can fetch content using a sample called path and
> all its derivatives, including path_reg.
>
> Actually, when I add the following in my conf:
> http-request set-header X-blah %[path_reg .*]
> I have a configuration parsing error because of the slash.
> When I backslash it:
> http-request set-header X-blah %[path_reg\ .*]
> The configuration is valid (from a syntax point of view) but HAProxy
> doesn't do anything.
>
>
> So in your case, I would do this for now:
> acl url_id path_reg ^/([0-9]+)/.*$
> http-request set-header X_ID %[path] if url_id
> http-request replace-value X_ID ^/([0-9]+)/.*$ \1 if { req.hdr(X_ID) -m
> found }
>
> should do the trick.
>
> Baptiste
>
Re: Set header with value extracted from path
On Thu, Dec 4, 2014 at 12:09 AM, Ryan wrote:
> When I received URL's with the following format:
>
> /1/a/b/c
>
> I rewrite the URL removing the digit like so:
>
> /v2.0.0/a/b/c
>
> And I need to set a header with the value of the digit I replaced, i.e.:
>
> X-ID: 1
>
> Is it possible to do this within haproxy? I am able to reqrep the original
> url, and set an ACL to be used with an "http-request add-header" directive,
> but I dont know how to extract the url value and either save it for use in
> the add-header, or to write a format string in the add-header directive that
> will do this.
>
> I'm playing around with something like this but not having much luck:
>
> acl url_id path_reg ^/([0-9]+)/.*$
> http-request add-header X_ID %[path_reg(^/([0-9]+)/.*$)] if url_id
>
> Any ideas?
>
> Thanks,
> Ryan
Hi Rian,
Either there is a bug in the code or the documentation is inacurate,
in chapter 7.3.6 HTTP samples.
The document says we can fetch content using a sample called path and
all its derivatives, including path_reg.
Actually, when I add the following in my conf:
http-request set-header X-blah %[path_reg .*]
I have a configuration parsing error because of the slash.
When I backslash it:
http-request set-header X-blah %[path_reg\ .*]
The configuration is valid (from a syntax point of view) but HAProxy
doesn't do anything.
So in your case, I would do this for now:
acl url_id path_reg ^/([0-9]+)/.*$
http-request set-header X_ID %[path] if url_id
http-request replace-value X_ID ^/([0-9]+)/.*$ \1 if { req.hdr(X_ID) -m found }
should do the trick.
Baptiste
Set header with value extracted from path
When I received URL's with the following format: /1/a/b/c I rewrite the URL removing the digit like so: /v2.0.0/a/b/c And I need to set a header with the value of the digit I replaced, i.e.: X-ID: 1 Is it possible to do this within haproxy? I am able to reqrep the original url, and set an ACL to be used with an "http-request add-header" directive, but I dont know how to extract the url value and either save it for use in the add-header, or to write a format string in the add-header directive that will do this. I'm playing around with something like this but not having much luck: acl url_id path_reg ^/([0-9]+)/.*$ http-request add-header X_ID %[path_reg(^/([0-9]+)/.*$)] if url_id Any ideas? Thanks, Ryan
