Reworked multi headers to use linked lists. Multi headers are now using linked lists instead of arrays. Notably, the following fields were changed: r->headers_in.cookies (renamed to r->headers_in.cookie), r->headers_in.x_forwarded_for, r->headers_out.cache_control, r->headers_out.link, u->headers_in.cache_control u->headers_in.cookies (renamed to u->headers_in.set_cookie). The r->headers_in.cookies and u->headers_in.cookies fields were renamed to r->headers_in.cookie and u->headers_in.set_cookie to match header names. The ngx_http_parse_multi_header_lines() and ngx_http_parse_set_cookie_lines() functions were changed accordingly. With this change, multi headers are now essentially equivalent to normal headers, and following changes will further make them equivalent.

--- a/src/http/modules/ngx_http_geo_module.c
+++ b/src/http/modules/ngx_http_geo_module.c
@@ -327,15 +327,15 @@ static ngx_int_t
 ngx_http_geo_addr(ngx_http_request_t *r, ngx_http_geo_ctx_t *ctx,
     ngx_addr_t *addr)
 {
-    ngx_array_t  *xfwd;
+    ngx_table_elt_t  *xfwd;
 
     if (ngx_http_geo_real_addr(r, ctx, addr) != NGX_OK) {
         return NGX_ERROR;
     }
 
-    xfwd = &r->headers_in.x_forwarded_for;
+    xfwd = r->headers_in.x_forwarded_for;
 
-    if (xfwd->nelts > 0 && ctx->proxies != NULL) {
+    if (xfwd != NULL && ctx->proxies != NULL) {
         (void) ngx_http_get_forwarded_addr(r, addr, xfwd, NULL,
                                            ctx->proxies, ctx->proxy_recursive);
     }