# REST API Version History

This documents the changes made to the REST API with every microversion change. The description for each version should be a verbose one which has enough information to be suitable for use in user documentation.

## 1.0

This is the initial version of the v1.0 API which supports microversions. The v1.0 API is from the REST API users’s point of view exactly the same as v1 except with strong input validation.

A user can specify a header in the API request:

    OpenStack-API-Version: <version>

where `<version>` is any valid api version for this API.

If no version is specified then the API will behave as if a version request of v1.0 was requested.

this page last updated: 2026-04-13 10:34:52

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