# `IMDS.Providers.GCE`

Google Compute Engine VM metadata server.

Every request sends `Metadata-Flavor: Google`. Detection requires both a
non-empty instance ID and a response header with the value `Google`.

# `region_from_zone`

```elixir
@spec region_from_zone(binary() | nil) :: binary() | nil
```

Derive the region from a zone name.

## Examples

    iex> IMDS.Providers.GCE.region_from_zone("europe-west1-b")
    "europe-west1"

    iex> IMDS.Providers.GCE.region_from_zone("projects/123/zones/europe-west1-b")
    "europe-west1"

    iex> IMDS.Providers.GCE.region_from_zone(nil)
    nil

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*Consult [api-reference.md](api-reference.md) for complete listing*