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[Qin Zhao <chaochin@xxxxxxxxx>]

Public bug reported:

Related bug -->  https://bugs.launchpad.net/nova/+bug/1363901

When attaching interface to an instance, Neutron may return several
types of error to Nova (Eg. PortNotFound, PortInUse and etc.) Nova need
to translate those error into a correct HTTP error code, so that end
user will be able to know the exact failure reason.

According to http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html, my
proposed mapping between Nova error and HTTP error code is:

PortNotFound    404
FixedIpAlreadyInUse    409	
PortInUse    409
NetworkDuplicated    400
NetworkAmbiguous    400
NetworkNotFound    404

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1380901

Title:
  Refine HTTP error code for os-interface

Status in OpenStack Compute (Nova):
  New

Bug description:
  Related bug -->  https://bugs.launchpad.net/nova/+bug/1363901

  When attaching interface to an instance, Neutron may return several
  types of error to Nova (Eg. PortNotFound, PortInUse and etc.) Nova
  need to translate those error into a correct HTTP error code, so that
  end user will be able to know the exact failure reason.

  According to http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html,
  my proposed mapping between Nova error and HTTP error code is:

  PortNotFound    404
  FixedIpAlreadyInUse    409	
  PortInUse    409
  NetworkDuplicated    400
  NetworkAmbiguous    400
  NetworkNotFound    404

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