mongoose/docs/c-api/mg_util.h/mg_basic_auth_header.md

title	decl_name	symbol_kind	signature
mg_basic_auth_header()	mg_basic_auth_header	func	void mg_basic_auth_header(const struct mg_str user, const struct mg_str pass, struct mbuf *buf);

Generate a Basic Auth header and appends it to buf. If pass is NULL, then user is expected to contain the credentials pair already encoded as user:pass.