How is module type value (NGX_HTTP_MODULE) is generated?

Hi, I am curious how is module type like NGX_HTTP_MODULE in
ngx_http_config.h is generated? Thanks!
#define NGX_HTTP_MODULE 0x50545445 /* “HTTP” */

Posted at Nginx Forum:

On Tuesday 15 December 2015 13:04:20 chuang39 wrote:

Hi, I am curious how is module type like NGX_HTTP_MODULE in
ngx_http_config.h is generated? Thanks!
#define NGX_HTTP_MODULE 0x50545445 /* “HTTP” */

It’s “HTTP” in ASCII.

wbr, Valentin V. Bartenev