mongoose/docs/c-api/http_server.h/mg_http_send_error.md

title, decl_name, symbol_kind, signature

title	decl_name	symbol_kind	signature
mg_http_send_error()	mg_http_send_error	func	void mg_http_send_error(struct mg_connection *nc, int code, const char *reason);

Sends an error response. If reason is NULL, the message will be inferred from the error code (if supported).