### Method 1
**Steps to replicate the issue** (include links if applicable):
* visit https://api.slack.com/tools/unfurl-debugger
* add a Phab URL such as https://phabricator.wikimedia.org/T288117
* click "Submit Query"
**What happens?**:
{F65676860}
**What should have happened instead?**:
* traffic served normally
### Method 2
**Steps to replicate the issue** (include links if applicable):
* go into a chat client such as Discord
* send a message in a chat room containing a Phab link such as https://phabricator.wikimedia.org/T288117
**What happens?**:
{F65676869}
**What should have happened instead?**:
{F65676873}
### Notes
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
* lots of additional info in {T288117}, starting from comment T288117#11005891 downward