in maven-wrapper/src/main/java/org/apache/maven/wrapper/DefaultDownloader.java [148:155]
private String calculateUserInfo(URI uri) {
String username = System.getenv(MVNW_USERNAME);
String password = System.getenv(MVNW_PASSWORD);
if (username != null && password != null) {
return username + ':' + password;
}
return uri.getUserInfo();
}