nginx 0.1.14 *) Feature: the autoconfiguration directives: --http-client-body-temp-path=PATH, --http-proxy-temp-path=PATH, and --http-fastcgi-temp-path=PATH *) Change: the directory name for the temporary files with the client request body is specified by directive client_body_temp_path, by default it is <prefix>/client_body_temp. *) Feature: the ngx_http_fastcgi_module and the directives: fastcgi_pass, fastcgi_root, fastcgi_index, fastcgi_params, fastcgi_connect_timeout, fastcgi_send_timeout, fastcgi_read_timeout, fastcgi_send_lowat, fastcgi_header_buffer_size, fastcgi_buffers, fastcgi_busy_buffers_size, fastcgi_temp_path, fastcgi_max_temp_file_size, fastcgi_temp_file_write_size, fastcgi_next_upstream, and fastcgi_x_powered_by. *) Bugfix: the "[alert] zero size buf" error; bug appeared in 0.1.3. *) Change: the URI must be specified after the host name in the proxy_pass directive. *) Change: the %3F symbol in the URI was considered as the argument string start. *) Feature: the unix domain sockets support in the ngx_http_proxy_module. *) Feature: the ssl_engine and ssl_ciphers directives. Thanks to Sergey Skvortsov for SSL-accelerator.

--- a/src/core/ngx_conf_file.h
+++ b/src/core/ngx_conf_file.h
@@ -239,8 +239,8 @@ char *ngx_conf_check_num_bounds(ngx_conf
     }
 
 #define ngx_conf_merge_str_value(conf, prev, default)                        \
-    if (conf.len == 0) {                                                     \
-        if (prev.len) {                                                      \
+    if (conf.data == NULL) {                                                 \
+        if (prev.data) {                                                      \
             conf.len = prev.len;                                             \
             conf.data = prev.data;                                           \
         } else {                                                             \