Bug in request.headers_out initialization?

Igor Sysoev igor at sysoev.ru
Wed Nov 23 16:40:55 UTC 2011

On Wed, Nov 23, 2011 at 10:04:06PM +0530, Fasih wrote:
> Hi
> I have a plugin that uses request.headers_out.headers, I use the
> lowcase_key of the element for something. However, recently while debugging
> a crash I noticed that the lowcase_key isnt always initialized
> [e.g.  src/http/modules/ngx_http_userid_filter_module.c:424,
> set_cookie->lowcase_key isnt set(nor initialized)] I would have taken that
> as a bug but noticed that there are other places
> [src/http/modules/ngx_http_headers_filter_module.c] where lowcase_key isnt
> initialized. However, in all the three instances, header.hash is
> initialized to 1.
> So, the question is:
> 1. Does hash = 1 necessarily imply that lowcase_key isnt initialized?
> 2. Should lowcase_key have been initialized and this is a bug [in which
> case I can walk through the code and submit a patch]
> 3. Why is this done?

lowcase_key is used in r->headers_in only to find them in headers_in_hash.

Igor Sysoev

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