HTTP proxy

To allow HTTP requests reach the outside world, we maintain a caching HTTP proxy in each datacenter. They are exposed using services entries of the form webproxy.<datacenter>.wmnet.

How-to?

Service Name	Server	port
webproxy.eqiad.wmnet	install1003.wikimedia.org	8080
webproxy.codfw.wmnet	install2003.wikimedia.org	8080
webproxy.esams.wmnet	install3001.wikimedia.org	8080
webproxy.ulsfo.wmnet	install4001.wikimedia.org	8080
webproxy.eqsin.wmnet	install5001.wikimedia.org	8080
webproxy.drmrs.wmnet	install6001.wikimedia.org	8080

You can set the http_proxy and https_proxy environment variables to make many command-line scripts use the site specific proxy automatically.

export http_proxy=http://webproxy:8080
export https_proxy=http://webproxy:8080
export HTTP_PROXY=http://webproxy:8080
export HTTPS_PROXY=http://webproxy:8080
export no_proxy=127.0.0.1,::1,localhost,.wmnet,.wikimedia.org,.wikipedia.org,.wikibooks.org,.wikiquote.org,.wiktionary.org,.wikisource.org,.wikispecies.org,.wikiversity.org,.wikidata.org,.mediawiki.org,.wikinews.org,.wikivoyage.org
export NO_PROXY=127.0.0.1,::1,localhost,.wmnet,.wikimedia.org,.wikipedia.org,.wikibooks.org,.wikiquote.org,.wiktionary.org,.wikisource.org,.wikispecies.org,.wikiversity.org,.wikidata.org,.mediawiki.org,.wikinews.org,.wikivoyage.org

"no_proxy" MUST be explicitly set
- Prevents unnecessary load on the proxies (to fetch internal resources)
- Prevents stale data cached on the proxies
- Prevents unnecessary dependencies
HTTP proxies SHOULD NOT be configured by default, but on a case by case (need) basis
- It's preferred to set these variables for your current session only by running the same commands at the terminal prompt
- services should leverage Puppet to configure proxies
- If the alternatives are not possible, add these lines to your ~/.profile file
These proxies MUST NOT be used from Cloud VPS instances (enforced by ACLs)

Internal endpoints

It is better to use internal endpoints instead of public ones, a list or reasons is visible on this comment.

API

Use e.g. https://api-ro.discovery.wmnet and set the HTTP Host header to the domain of the site you want to access, e.g. curl -H "Host: www.wikidata.org" https://api-ro.discovery.wmnet

For examples in Python and R refer to these notes.

ORES

Similar to above, but use https://ores.discovery.wmnet

A complete list exists at: https://config-master.wikimedia.org/discovery/discovery-basic.yaml

Example usage

curl

If you are using curl, you can use the --proxy flag:

curl --proxy http://webproxy.eqiad.wmnet:8080 http://www.google.com

Monitoring

Access log dashboard: https://logstash.wikimedia.org/app/dashboards#/view/58c908a0-a394-11ec-bf8e-43f1807d5bc2

Requests: https://grafana.wikimedia.org/d/i5YA-BXWz/squid

Future/possible improvements

Helper script to correctly configure the proxies for the current user session - T278315 - global http_proxy setting
Centrally managed global no_proxy settings - T278315 - global http_proxy setting
Maybe restrict domains accessible by webproxy
Improve proxies redundancy - T242715
Merge url-downloader and the web-proxies?

Reference

Gerrit change adding the DNS entries