> On 13 May 2022, at 02:32, Maxim Dounin <mdounin@mdounin.ru> wrote:
>
> Hello!
>
> On Wed, May 11, 2022 at 07:32:32PM +0400, Sergey Kandaurov wrote:
>
>> On Thu, Apr 21, 2022 at 01:18:42AM +0300, Maxim Dounin wrote:
>>> # HG changeset patch
>>> # User Maxim Dounin <mdounin@mdounin.ru>
>>> # Date 1650492316 -10800
>>> # Thu Apr 21 01:05:16 2022 +0300
>>> # Node ID 61b29233a55216c6fa72e23b93a4a28d76a9fb94
>>> # Parent e70fb0fdfbc0fb7b7e9f493cc2eb65de617b115a
>>> FastCGI: combining headers with identical names (ticket #1724).
[..]
>>> diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
>>> --- a/src/http/ngx_http_core_module.c
>>> +++ b/src/http/ngx_http_core_module.c
>>> @@ -2802,6 +2802,78 @@ ngx_http_get_forwarded_addr_internal(ngx
>>> }
>>>
>>>
>>> +ngx_int_t
>>> +ngx_http_link_multi_headers(ngx_http_request_t *r)
>>> +{
>>> + ngx_uint_t i, j;
>>> + ngx_list_part_t *part, *ppart;
>>> + ngx_table_elt_t *header, *pheader, **ph;
>>> +
>>> + if (r->headers_in.multi_linked) {
>>> + return NGX_OK;
>>> + }
>>
>> multi_linked is never set, was the intension to avoid doing the work
>> twice on repetitive invocation? it doesn't seem to be possible.
>> I'd just axe it.
>
> Yes, thanks, missed this somehow. It should be set right after
> the test, updated with the following change:
>
> diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
> --- a/src/http/ngx_http_core_module.c
> +++ b/src/http/ngx_http_core_module.c
> @@ -2813,6 +2813,8 @@ ngx_http_link_multi_headers(ngx_http_req
> return NGX_OK;
> }
>
> + r->headers_in.multi_linked = 1;
> +
> part = &r->headers_in.headers.part;
> header = part->elts;
>
>
> Not sure what do you mean by "doesn't seem to be possible". The
> request headers are never changed after parsing, so it is enough
> to link them just once.
Nevermind, the point was the function itself is called just once.
But it's not so as part of internal redirect to another upstream.
[..]
--
Sergey Kandaurov
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