Yes, looks like you're right. It seems odd that we have some paths that
assign r->headers_out and some that don't.
In any case, here is the updated patch. It may be worth opening this as a
bug report so we can keep track of it easier.
On Wed, Sep 16, 2015 at 3:47 AM, Yann Ylavic <ylavic....@gmail.com> wrote:
> Hi Ed,
>
> On Tue, Sep 15, 2015 at 10:10 PM, Edward Lu <chaos...@gmail.com> wrote:
> > This looks like a bug. I believe I've tracked down the cause to a single
> > errant line in the cache module; can you apply the attached patch to
> 2.4.x
> > and see if it fixes the problem?
>
> I think the patch would also need this hunk:
>
> Index: modules/cache/mod_cache.c
> ===================================================================
> --- modules/cache/mod_cache.c (revision 1703149)
> +++ modules/cache/mod_cache.c (working copy)
> @@ -1462,6 +1462,7 @@ static apr_status_t cache_save_filter(ap_filter_t
> * forward all of them to the client, including non-cacheable
> ones).
> */
> r->headers_out = cache_merge_headers_out(r);
> + apr_table_clear(r->err_headers_out);
>
> /* Merge in our cached headers. However, keep any updated
> values. */
> /* take output, overlay on top of cached */
> --
>
> Otherwise we might leave this path with some headers both in
> headers_out and err_headers_out.
>
> Regards,
> Yann.
>
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>
diff --git a/modules/cache/cache_util.c b/modules/cache/cache_util.c
index b7454ad..070a5f0 100644
--- a/modules/cache/cache_util.c
+++ b/modules/cache/cache_util.c
@@ -1254,7 +1254,6 @@ apr_table_t *cache_merge_headers_out(request_rec *r)
headers_out = apr_table_overlay(r->pool, r->headers_out,
r->err_headers_out);
- apr_table_clear(r->err_headers_out);
if (r->content_type
&& !apr_table_get(headers_out, "Content-Type")) {
diff --git a/modules/cache/mod_cache.c b/modules/cache/mod_cache.c
index b95f0a8..091d527 100644
--- a/modules/cache/mod_cache.c
+++ b/modules/cache/mod_cache.c
@@ -1452,6 +1452,7 @@ static apr_status_t cache_save_filter(ap_filter_t *f, apr_bucket_brigade *in)
* forward all of them to the client, including non-cacheable ones).
*/
r->headers_out = cache_merge_headers_out(r);
+ apr_table_clear(r->err_headers_out);
/* Merge in our cached headers. However, keep any updated values. */
/* take output, overlay on top of cached */
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