; http://www.mail-archive.com/dev%40httpd.apache.org/msg56690.html
diff -ur a/server/mpm_common.c b/server/mpm_common.c
--- a/server/mpm_common.c	2012-07-03 21:38:58.000000000 +0200
+++ b/server/mpm.common.c	2013-04-12 09:14:58.282929959 +0200
@@ -604,7 +604,17 @@
         len = strlen(data);
     }
 
-    apr_socket_send(sock, data, &len);
+    rv = apr_socket_send(sock, data, &len);
+    if (rv == APR_SUCCESS) {
+        char *buffer[10]; // dummy buffer to see if child is alive
+
+        len = sizeof(buffer);
+        rv = apr_socket_recv(sock, buffer, &len);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf,
+                         "receiving response to dummy data to listener on %pI", lp->bind_addr);
+        }
+    }
     apr_socket_close(sock);
     apr_pool_destroy(p);