Wrap ngx_table_elt_t operations into version checks

Author: oxpa

src/ngx_http_lua_control.c

@@ -280,7 +280,9 @@ ngx_http_lua_ngx_redirect(lua_State *L)
 
     h->value.len = len;
     h->value.data = uri;
+#if defined(nginx_version) && nginx_version >= 1023000
     h->next = NULL;
+#endif
     ngx_str_set(&h->key, "Location");
 
     r->headers_out.status = rc;

src/ngx_http_lua_headers_in.c

@@ -280,7 +280,9 @@ ngx_http_set_header_helper(ngx_http_request_t *r, ngx_http_lua_header_val_t *hv,
 
     h->key = hv->key;
     h->value = *value;
+#if defined(nginx_version) && nginx_version >= 1023000
     h->next = NULL;
+#endif
 
     h->lowcase_key = ngx_pnalloc(r->pool, h->key.len);
     if (h->lowcase_key == NULL) {

src/ngx_http_lua_headers_out.c

@@ -229,7 +229,9 @@ ngx_http_set_header_helper(ngx_http_request_t *r, ngx_http_lua_header_val_t *hv,
 
     h->key = hv->key;
     h->value = *value;
+#if defined(nginx_version) && nginx_version >= 1023000
     h->next = NULL;
+#endif
 
     h->lowcase_key = ngx_pnalloc(r->pool, h->key.len);
     if (h->lowcase_key == NULL) {
@@ -445,7 +447,6 @@ ngx_http_set_builtin_multi_header(ngx_http_request_t *r,
     }
 
     ho->key = hv->key;
-    ho->next = NULL;
     *ph = ho;
 
     return NGX_OK;

src/ngx_http_lua_subrequest.c

@@ -1667,6 +1667,9 @@ ngx_http_lua_copy_request_headers(ngx_http_request_t *sr,
 
         clh->hash = ngx_http_lua_content_length_hash;
         clh->key = ngx_http_lua_content_length_header_key;
+#if defined(nginx_version) && nginx_version >= 1023000
+        clh->next = NULL;
+#endif
         clh->lowcase_key = ngx_pnalloc(sr->pool, clh->key.len);
         if (clh->lowcase_key == NULL) {
             return NGX_ERROR;