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[Andrey Volkov <avolkov@xxxxxxxxxxxx>]

Thanks for the report.

What do you mean by empty string? My tests show the following:
put tags [] => no tags created
put tags [''] => u'' is too short
put tags ['   '] => ok

Looks like it corresponds with docs. http://ix.io/pTo

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1680660

Title:
  empty string server tag can be created

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ===========
  In compute api description "Server tags (servers, tags)¶
  Tag is a non-empty string."

  But actually we can create empty string server tags via api Replace Tags:
   PUT  /servers/{server_id}/tags

  
  Steps to reproduce
  ==================
  PUT  /servers/{server_id}/tags with empty string

  Expected result
  ===============
  Fail to create, or we need to modify the api doc

  Actual result
  =============
  Update successfully, but api doc says it it not allowed.

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