Why do I see "Invalid URI in request" in httpd error.log?

Solution Unverified - Updated -

Issue

  • Why do I see "Invalid URI in request" in httpd error.log?

Sample log:

# tail -1 /var/log/httpd/error_log
[Tue Aug 18 06:41:08 2015] [error] [client 192.168.122.1] Invalid URI in request GET test.html HTTP/1.1

Environment

  • Red Hat Enterprise Linux 5, 6, 7
  • httpd

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