nginx 0.1.16 *) Bugfix: if the response were transferred by chunks, then on the HEAD request the final chunk was issued. *) Bugfix: the "Connection: keep-alive" header were issued, even if the keepalive_timeout directive forbade the keep-alive use. *) Bugfix: the errors in the ngx_http_fastcgi_module caused the segmentation faults. *) Bugfix: the compressed response encrypted by SSL may not transferred complete. *) Bugfix: the TCP-specific TCP_NODELAY, TCP_NOPSUH, and TCP_CORK options, are not used for the unix domain sockets. *) Feature: the rewrite directive supports the arguments rewriting. *) Bugfix: the response code 400 was returned for the POST request with the "Content-Length: 0" header; bug appeared in 0.1.14.

--- a/src/http/modules/ngx_http_chunked_filter.c
+++ b/src/http/modules/ngx_http_chunked_filter.c
@@ -67,7 +67,7 @@ static ngx_int_t ngx_http_chunked_body_f
     ngx_buf_t    *b;
     ngx_chain_t   out, tail, *cl, *tl, **ll;
 
-    if (in == NULL || !r->chunked) {
+    if (in == NULL || !r->chunked || r->header_only) {
         return ngx_http_next_body_filter(r, in);
     }