url-downloader is a Squid non-caching proxy for HTTP requests. It was originally created for MediaWiki's upload-by-URL functionality, these days it is being used by any service that wants to access resources outside the boundaries of the wikimedia production realm. It is not a highly available service and as such no assumptions should be made in code regarding availability
- See also url_downloader in Puppet.
- For eqiad: Hosted on
- For codfw: Hosted on
In both datacenters only one url-downloader is active at any time, and is pointed at via the DNS record for
url-downloader.$DC.wikimedia.org, and exposed at
url-downloader.wikimedia.org:8080 points to eqiad for backward-compatibility.
In MediaWiki configuration, it would be typically obtained via
$wmgLocalServices['urldownloader'] (which also provides an appropriate proxy URL on beta).