nginx 0.8.32 *) Bugfix: UTF-8 encoding usage in the ngx_http_autoindex_module. Thanks to Maxim Dounin. *) Bugfix: regular expression named captures worked for two names only. Thanks to Maxim Dounin. *) Bugfix: now the "localhost" name is used in the "Host" request header line, if an unix domain socket is defined in the "auth_http" directive. Thanks to Maxim Dounin. *) Bugfix: nginx did nor support chunked transfer encoding for 201 responses. Thanks to Julian Reich. *) Bugfix: if the "expires modified" set date in the past, the a negative number was set in the "Cache-Control" response header line. Thanks to Alex Kapranoff.

--- a/src/mail/ngx_mail_auth_http_module.c
+++ b/src/mail/ngx_mail_auth_http_module.c
@@ -1405,7 +1405,14 @@ ngx_mail_auth_http(ngx_conf_t *cf, ngx_c
 
     ahcf->peer = u.addrs;
 
-    ahcf->host_header = u.host;
+    if (u.family != AF_UNIX) {
+        ahcf->host_header = u.host;
+
+    } else {
+        ahcf->host_header.len = sizeof("localhost") - 1;
+        ahcf->host_header.data = (u_char *) "localhost";
+    }
+
     ahcf->uri = u.uri;
 
     if (ahcf->uri.len == 0) {