url-downloader
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url-downloader is a Squid caching proxy for HTTP requests. It was originally created for MediaWiki's upload-by-URL functionality.
Service
- See also url_downloader in Puppet.
- For eqiad: Hosted on
urldownloader100[12].wikimedia.org - For codfw: Hosted on
urldownloader200[12].wikimedia.org
In both datacenters only one url-downloader is active at any time, and is pointed at via the DNS record for url-downloader.$DC.wikimedia.org, and exposed at url-downloader.$DC.wikimedia.org:8080.
url-downloader.wikimedia.org:8080 points to eqiad for backward-compatibility.
In MediaWiki configuration, it would be typically obtained via $wmfLocalServices['urldownloader'] (which also provides an appropriate proxy URL on beta).
See also
- HTTP proxy (another set of squid proxies for slightly different use cases)
- T254011: Why do we have 2 sets of squid proxies?