ngx_http_proxy_cache_key  128 http/modules/ngx_http_proxy_module.c static char *ngx_http_proxy_cache_key(ngx_conf_t *cf, ngx_command_t *cmd,
ngx_http_proxy_cache_key  330 http/modules/ngx_http_proxy_module.c       ngx_http_proxy_cache_key,