RFC 6455, "The WebSocket Protocol", December 2011

Note: This RFC has been updated by RFC 7936, RFC 8307, RFC 8441

Errata ID: 4919
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Jefferson Carpenter
Date Reported: 2017-01-28

Section 7.4.1 says:

1001 indicates that an endpoint is "going away", such as a server
      going down or a browser having navigated away from a page.

It should say:

(unsure)

Notes:

This status code apparently covers two entirely different situations: a server going down, and a browser having navigated away. What is meant by "going away", why can't these be 2 different status codes? That info should be present in the RFC text.

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