nginx-0.1.34-RELEASE import

    *) Bugfix: the worker process may got caught in an endless loop if the
       big response part were include by SSI.

    *) Bugfix: the variables set by the "set" directive were not available
       in SSI.

    *) Feature: the "autoindex_localtime" directive.

    *) Bugfix: the empty value of the "proxy_set_header" directive forbids
       the client request header line passing.
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 92dd6cc..0211dab 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1576,6 +1576,10 @@
 
         *name = src[i].key;
 
+        if (src[i].value.len == 0) {
+            continue;
+        }
+
         if (ngx_http_script_variables_count(&src[i].value) == 0) {
             copy = ngx_array_push_n(conf->headers_set_len,
                                     sizeof(ngx_http_script_copy_code_t));