fix: skip subrequests and internal redirects in post_read_request

- FIX: Guard post_read_request hook with r->main and r->prev checks to
  avoid logging duplicate lines for subrequests and internal redirects
- DOC: Document subrequest/redirect filtering in architecture.yml

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

architecture.yml

@@ -31,6 +31,10 @@ context:
       Log as soon as the HTTP request is fully read to capture input-side data
       (client/server addresses, request line, headers) without waiting for
       application processing.
+    filters:
+      - Subrequests (r->main != NULL) are skipped.
+      - Internal redirects (r->prev != NULL) are skipped.
+      - Only the original client request is logged.
   logging_scope:
     coverage: all-traffic
     description: >

mod_reqin_log.spec

@@ -1,4 +1,4 @@
-%global spec_version 1.0.15
+%global spec_version 1.0.16
 
 Name:           mod_reqin_log
 Version:        %{spec_version}
@@ -37,6 +37,10 @@ install -m 644 %{_pkgroot}/%{_sysconfdir}/httpd/conf.d/mod_reqin_log.conf %{buil
 %doc %{_docdir}/%{name}
 
 %changelog
+* Thu Mar 05 2026 Developer <dev@example.com> - 1.0.16
+- FIX: Skip subrequests and internal redirects to log only the original client request
+- DOC: Document subrequest/redirect filtering in architecture.yml
+
 * Thu Mar 05 2026 Developer <dev@example.com> - 1.0.15
 - FIX: timestamp field now uses r->request_time (request reception time) instead of apr_time_now()
 - DOC: Remove unparsed_uri and fragment fields from architecture.yml (not logged)

src/mod_reqin_log.c

@@ -900,6 +900,11 @@ static int reqin_log_post_read_request(request_rec *r)
 {
     reqin_log_server_conf_t *srv_conf = get_server_conf(r->server);
 
+    /* Skip subrequests and internal redirects to log only the original hit */
+    if (r->main != NULL || r->prev != NULL) {
+        return DECLINED;
+    }
+
     if (srv_conf == NULL || srv_conf->config == NULL ||
         !srv_conf->config->enabled || srv_conf->config->socket_path == NULL) {
         return DECLINED;