pub unsafe extern "C" fn ngx_http_upstream_hide_headers_hash(
cf: *mut ngx_conf_s,
conf: *mut ngx_http_upstream_conf_t,
prev: *mut ngx_http_upstream_conf_t,
default_hide_headers: *mut ngx_str_t,
hash: *mut ngx_hash_init_t,
) -> isize