Is ngx_http_headers_out dead code?

[洪志道]

Hi,
I wonder if the `ngx_http_headers_out` variable is being used? If yes, what
is it for?

```
/* src/http/ngx_http_header_filter_module.c */

 ngx_http_header_out_t  ngx_http_headers_out[] = {
     { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
     { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
@@ -151,6 +152,7 @@

     { ngx_null_string, 0 }
 };
```

Thanks.
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