Why do HTTP 499 status codes appear in the nginx access log?

Solution In Progress - Updated -

Issue

I see 499 status codes written to the nginx access log as shown below. Notice the HTTP 499 status and zero bytes written as a response.

[01/Jan/2017:00:00:00 -0500] "POST /Request/Path HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Software Collections
  • nginx 1.8

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