using mod_filter on non-200 responses

[Andrew Huntwork <ash@xxxxxxxxxxxx>]

I'm trying to use mod_filter (specifically mod_substitute) on non-200
responses, specifically with a 404 response.  After playing around for
a while and assuming that i had screwed something up, i discovered
that mod_filter specifically skips non-200 responses [1].  Is there an
important reason for skipping such responses?  would a patch to make
skipping such responses configurable be accepted into the main distro
if i wrote it?

thanks,

andy

1.
static apr_status_t filter_harness(ap_filter_t *f, apr_bucket_brigade *bb)

{

    apr_status_t ret;

    const char *cachecontrol;

    char *str;

    harness_ctx *ctx = f->ctx;

    ap_filter_rec_t *filter = f->frec;



    if (f->r->status != 200) {

        ap_remove_output_filter(f);

        return ap_pass_brigade(f->next, bb);

    }

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