Lighttpd

https://github.com/lighttpd/lighttpd1.4/pull/44 was committed in r3130

lighttpd -tt (two -tt) processes the config file up through the unknown config key warnings, actually initializing all modules (except binding to sockets and opening log files). While this exits 0 unless there is an error, you can easily write a script to capture stderr and to treat any output to stderr as an error.

I missed adding preflight checks around mod_fastcgi and mod_scgi spawning of local backend processes. Please apply this additional patch.

diff --git a/src/mod_fastcgi.c b/src/mod_fastcgi.c
index 9c50fa7..a9c300a 100644
--- a/src/mod_fastcgi.c
+++ b/src/mod_fastcgi.c
@@ -1428,7 +1428,8 @@ SETDEFAULTS_FUNC(mod_fastcgi_set_defaults) {
                                                                                "\n\tcurrent:", pno, "/", host->max_procs);
                                                        }

-                                                       if (fcgi_spawn_connection(srv, p, host, proc)) {
+                                                       if (!srv->srvconf.preflight_check
+                                                           && fcgi_spawn_connection(srv, p, host, proc)) {
                                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                                "[ERROR]: spawning fcgi failed.");
                                                                fastcgi_process_free(proc);
diff --git a/src/mod_scgi.c b/src/mod_scgi.c
index b7b6b3b..308c9df 100644
--- a/src/mod_scgi.c
+++ b/src/mod_scgi.c
@@ -1189,7 +1189,8 @@ SETDEFAULTS_FUNC(mod_scgi_set_defaults) {
                                                                                "\n\tcurrent:", pno, "/", df->min_procs);
                                                        }

-                                                       if (scgi_spawn_connection(srv, p, df, proc)) {
+                                                       if (!srv->srvconf.preflight_check
+                                                           && scgi_spawn_connection(srv, p, df, proc)) {
                                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                                "[ERROR]: spawning fcgi failed.");
                                                                scgi_process_free(proc);

updated in c4edd356