**Steps to replicate the issue** (include links if applicable):
open hewiki (version upgrades a day before most other wiki), on article [[ https://he.wikipedia.org/wiki/פולינום | פולינום ]] (polynomial).
all formulas are turned to ugly red error messages with huge text. the crux of the error looks like so:
("Math extension cannot connect to Restbase.") מהשרת "http://localhost:6011/he.wikipedia.org/v1/v1/":)
clearly, "localhost" there is out of place - readers do not run local server listening on port 6011 on their own machines.
this is a serious breakage, afflicting any article using the <math> tag or any template using it, and is going to hit all the major wikis in less than a day.
can't assign priorities myself, but i would call this "critical".
peace.
**What should have happened instead?**:
math formulas should be displayed as math formulas instead of the error message
**Software version** (skip for WMF-hosted wikis like Wikipedia):
1.41.0-wmf.12 (e54da81)
**Other information** (browser name/version, screenshots, etc.):
unfortunately, screenshot in hebrew... :)
{F37097348}