[Bug 1717615] Re: encoded slashes being blocked by Apache

[Corey Bryant]

Regression testing with OpenStack tempest has completed successfully:

xenial-ocata proposed stable charms:

======                   
Totals                   
======                   
Ran: 102 tests in 1742.1837 sec.                  
 - Passed: 93            
 - Skipped: 9            
 - Expected Fail: 0      
 - Unexpected Success: 0 
 - Failed: 0             
Sum of execute time for each test: 856.3288 sec.

xenial-ocata proposed dev charms:

======
Totals
======
Ran: 102 tests in 1987.3271 sec.
 - Passed: 93
 - Skipped: 9
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 1008.6304 sec.

zesty-ocata proposed stable charms:

======
Totals
======
Ran: 102 tests in 1604.2247 sec.
 - Passed: 93
 - Skipped: 9
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 843.3645 sec.

zesty-ocata proposed dev charms:

======
Totals
======
Ran: 102 tests in 1579.9423 sec.
 - Passed: 93
 - Skipped: 9
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 867.0801 sec.

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https://bugs.launchpad.net/bugs/1717615

Title:
  encoded slashes being blocked by Apache

Status in OpenStack heat charm:
  Invalid
Status in Charm Helpers:
  Invalid
Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive mitaka series:
  Fix Committed
Status in Ubuntu Cloud Archive newton series:
  Triaged
Status in Ubuntu Cloud Archive ocata series:
  Fix Committed
Status in OpenStack Heat:
  Invalid
Status in python-heatclient package in Ubuntu:
  Fix Released
Status in python-heatclient source package in Xenial:
  Fix Committed
Status in python-heatclient source package in Zesty:
  Fix Committed

Bug description:
  [Impact]
  We came across a situation where we were unable to view resources in a stack inside Horizon. We traced it down to a communication problem with the Heat Apache frontend and Heat. After adjusting the log level for Apache, we came across the following error in the logs:

  [client 213.173.193.177:33920] AH00026: found %2f (encoded '/') in URI
  (decoded='/v1/c064a39d602d4f42bc49e09057c97683/stacks/heat_test_foo/b5c125a3-d452-49a1-
  a12e-03e098fbb38c/resources/foo_vm-01'), returning 404

  As a workaround, we currently added the following line to the
  /etc/apache/sites-enabled/openstack-https_frontend.conf on our Heat
  instance:

  AllowEncodedSlashes On

  It is worth noting we tried to use the NoDecode option as well and
  that is didn't resolve the problem.

  [Test Case]
  See details in impact section. For our testing we deploy OpenStack with the OpenStack charms to deploy Horizon, Heat, etc.

  
  [Regression Potential]
  Low. The patch being backported is from the upstream stable/pike branch. There were some minor adjustments required to apply the patch to earlier releases, but the patches are nearly identical.

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