Problem add http_400 for module upstream

[haonhien]

Hello every body!

I want to add http_400 in directive proxy_next_upstream of module
upstream:

1. Add code below in file src/http/ngx_http_upstream.h:
#define NGX_HTTP_UPSTREAM_FT_HTTP_502        0x00000020
#define NGX_HTTP_UPSTREAM_FT_HTTP_503        0x00000040
#define NGX_HTTP_UPSTREAM_FT_HTTP_504        0x00000080
#define NGX_HTTP_UPSTREAM_FT_HTTP_404        0x00000100

#define NGX_HTTP_UPSTREAM_FT_HTTP_400        0x00000120 //---> not
right

2.Add code below in file ngx_http_upstream.c:

   { 500, NGX_HTTP_UPSTREAM_FT_HTTP_500 },
   { 502, NGX_HTTP_UPSTREAM_FT_HTTP_502 },
   { 503, NGX_HTTP_UPSTREAM_FT_HTTP_503 },
   { 504, NGX_HTTP_UPSTREAM_FT_HTTP_504 },
   { 404, NGX_HTTP_UPSTREAM_FT_HTTP_404 },

   { 400, NGX_HTTP_UPSTREAM_FT_HTTP_400 }, //add code here

3.Add code below in file src/http/modules/ngx_http_proxy_module.c:

    { ngx_string("http_500"), NGX_HTTP_UPSTREAM_FT_HTTP_500 },
    { ngx_string("http_502"), NGX_HTTP_UPSTREAM_FT_HTTP_502 },
    { ngx_string("http_503"), NGX_HTTP_UPSTREAM_FT_HTTP_503 },
    { ngx_string("http_504"), NGX_HTTP_UPSTREAM_FT_HTTP_504 },
    { ngx_string("http_404"), NGX_HTTP_UPSTREAM_FT_HTTP_404 },

    { ngx_string("http_400"), NGX_HTTP_UPSTREAM_FT_HTTP_400 }, // add
code here

Plz help me 
Thank you so much.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,225010,225010#msg-225010