Slew of 503s on npmjs.com
Incident Report for npm
Resolved
The npmjs.com website was down for up to 15 minutes today, between 10:30 AM PT and 10:45 AM PT. This was due to a web spider, which slammed the website with a 500% spike in requests in the span of that time.

We have identified the bot and banned its user agent.
Posted Jul 20, 2016 - 18:10 UTC