Restrictions to modifying request->headers_in.headers in NGX_HTTP_PREACCESS_PHASE?

Maxim Dounin mdounin at
Wed Mar 28 19:56:45 UTC 2018


On Wed, Mar 28, 2018 at 03:47:04PM -0400, Ryan Burn wrote:

> I have a module that registers a handler to run in
> NGX_HTTP_PREACCESS_PHASE. The handler adds headers to
> request->headers_in.headers. This works as I would expect most of the
> time. But I am seeing cases of some crashes when calling
>       ngx_list_push(&request->headers_in.headers));
> Are there any restrictions where you are not allowed to push to
> headers_in.headers like that in the preaccess phase?

You are not allowed to modify r->headers_in, at any time.

Maxim Dounin

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