[SR-Users] remove_hf_re error on startup

[Daniel-Constantin Mierla]

For the records, I just pushed a patch implementing remove_hf_exp(match,
skip) in textops module, in which allows to provide two expressions: one
to match the header for removal and one to skip the header. Will be in
the next major release.

Otherwise, besides the workaround presented in this discussion, see also
keep_hf() from textopsx, it may help in some similar situations.

Cheers,
Daniel


On 27.06.17 11:30, Grant Bagdasarian wrote:
> Too bad!
> Your workaround works. 
> I'll use that instead.
> Thanks!
>
> -----Original Message-----
> From: sr-users [mailto:sr-users-bounces at lists.kamailio.org] On Behalf Of Daniel Tryba
> Sent: dinsdag 27 juni 2017 11:09
> To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
> Subject: Re: [SR-Users] remove_hf_re error on startup
>
> On Tue, Jun 27, 2017 at 08:48:07AM +0000, Grant Bagdasarian wrote:
>> I'm trying to remove all custom headers starting with X-, except a 
>> certain header, but Kamailio won't start due to an error.  ERROR:
>> <core> [route.c:1154]: fix_actions(): fixing failed (code=-1) at
>> cfg:/etc/kamailio/kamailio.cfg:455
>>
>> remove_hf_re("^(?!X-ThisHeaderShouldNotBeRemoved)X-.*") or
>> remove_hf_re("^(?!X- ThisHeaderShouldNotBeRemoved)X-")
>>
>> This is valid regex according to https://regex101.com/
>>
>> Any idea's why this won't compile?
> Maybe because kamailio uses a regular expression lib that doesn't support this syntax (since there is a seperate regex module that supports PCRE it implies the "standard" regexes don't).
>
> Easy work around is to remove all X- headers and add them again, something like:
>
> remove_hf_re("^X-");
> if(is_present_hf("X-ThisHeaderShouldNotBeRemoved"))
> {
>  append_hf("X-ThisHeaderShouldNotBeRemoved: $(hdr(X-ThisHeaderShouldNotBeRemoved))\r\n");
> }
>
>
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-- 
Daniel-Constantin Mierla
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