--- nginx-1.4.3/src/http/modules/ngx_http_gzip_filter_module.c	2013-10-08 05:07:14.000000000 -0700
+++ nginx-1.4.3-patched/src/http/modules/ngx_http_gzip_filter_module.c	2013-10-25 17:00:00.712697908 -0700
@@ -433,7 +433,15 @@ ngx_http_gzip_body_filter(ngx_http_reque
         if (ctx->out == NULL) {
             ngx_http_gzip_filter_free_copy_buf(r, ctx);
 
-            return ctx->busy ? NGX_AGAIN : NGX_OK;
+            if (ctx->busy) {
+                if (in == NULL) {
+                    return ngx_http_next_body_filter(r, NULL);
+                }
+
+                return NGX_AGAIN;
+            }
+
+            return NGX_OK;
         }
 
         if (!ctx->gzheader) {