Travis build is failing. Unable to fetch Ant

The travis build is failing with the following error message: The command

2016-06-09 21:04:51 ERROR 503: Service Unavailable.
"wget http://archive.apache.org/dist/ant/binaries/apache-ant-1.9.4-bin.tar.gz" failed and exited with 8 during .

The url is valid.

More details from the log:
$ wget http://archive.apache.org/dist/ant/binaries/apache-ant-1.9.4-bin.tar.gz
-2016-06-10 15:54:07- http://archive.apache.org/dist/ant/binaries/apache-ant-1.9.4-bin.tar.gz
Resolving archive.apache.org (archive.apache.org)... 163.172.17.199
Connecting to archive.apache.org (archive.apache.org)|163.172.17.199|:80... connected.
HTTP request sent, awaiting response... 503 Service Unavailable
2016-06-10 15:54:08 ERROR 503: Service Unavailable.