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

title	decl_name	symbol_kind	signature
mg_url_encode()	mg_url_encode	func	struct mg_str mg_url_encode(const struct mg_str src);

URL-escape the specified string. All non-printable characters are escaped, plus ._-$,;~()/. Input need not be NUL-terminated, but the returned string is. Returned string is heap-allocated and must be free()'d.