mongoose/docs/c-api/mg_net.h/mg_vprintf.md

title, decl_name, symbol_kind, signature

title	decl_name	symbol_kind	signature
mg_vprintf()	mg_vprintf	func	int mg_vprintf(struct mg_connection *, const char *fmt, va_list ap);

Same as mg_printf(), but takes va_list ap as an argument.