http_server疑问

[tommy.guo]

file_server示例中有一段代码

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* Handler to respond with an icon file embedded in flash.
 * Browsers expect to GET website icon at URI /favicon.ico.
 * This can be overridden by uploading file with same name */
static esp_err_t favicon_get_handler(httpd_req_t *req)
{
	extern const unsigned char favicon_ico_start[] asm("_binary_favicon_ico_start");
	extern const unsigned char favicon_ico_end[] asm("_binary_favicon_ico_end");
	const size_t favicon_ico_size = (favicon_ico_end - favicon_ico_start);
	httpd_resp_set_type(req, "image/x-icon");
	httpd_resp_send(req, (const char *)favicon_ico_start, favicon_ico_size);
	return ESP_OK;
}

将favicon_get_handler有关的代码全部删除，且没有注册/favicon_ico这个uri，但是访问服务器时还是会报

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W (327372) httpd_uri: httpd_uri: uri handler execution failed
W (327382) httpd_uri: httpd_uri: URI '/favicon.ico' not found

这是为什么呢？

[tommy.guo]

将项目fullclean之后，还是会有这个warning，但是将static esp_err_t favicon_get_handler(httpd_req_t *req)屏蔽之后，再编译下载就没有了，没想明白