http_copy_decode
uri = http_copy_decode(host, uri, hostlen, ":");
uri = http_copy_decode(username, uri, usernamelen, "@") + 1;
uri = http_copy_decode(host, uri, hostlen, ":/");
http_copy_decode(resource, uri, resourcelen, "");
static const char *http_copy_decode(char *dst, const char *src,