Manual:$wgEnableOpm

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<translate> HTTP proxy (CDN) settings</translate>: $wgEnableOpm
Use opm.blitzed.org to check for open proxies (never implemented).
<translate> Introduced in version:</translate>1.4.5
<translate> Removed in version:</translate>1.7.0
<translate> Allowed values:</translate>(boolean)
<translate> Default value:</translate>false

Details

Use opm.blitzed.org to check for open proxies. According to the documentation this variable was never actually used.