Bug: validateResponse fails on impression_data

[10111282]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the bug

Our Unleash setup is the following: unleash-client-php: v2.5.283 unleash edge: v19.2.0 unleash server: 6.0.6

Currently we use Unleash Edge v18.0.1, it works as expected. We are trying to upgrade Edge to v19.2.0 which causes unleash-client-php (v2.5.283) to always return null in validateResponse(). The reason is that Unleash Edge v19.2.0 returns the response with a bit different fields, in particular it returns impressionData instead of impression_data (Unleash Edge v18.0.1).

Unleash client is configure like this:

  UnleashBuilder::create()
      ->withAppName(config('services.unleash.app.name'))
      ->withAppUrl(config('services.unleash.edge.url'))
      ->withInstanceId(config('services.unleash.edge.srv'))
      ->withProxy(config('services.unleash.edge.key'))
      ->withCacheTimeToLive(30)
      ->withStaleTtl(300)
      ->build()

While debugging it I can see that the request is sent to /api/frontend/features/<feature name>

To reproduce

1. Invoke $unleash->isEnabled('some-feature-name');
2. Expected to be true if the feature is enabled, but result is always false.

Sample code (optional)

No response

Version

v2.5.283

Expected behavior

Within validateResponse() it must expect impressionData instead of impression_data, or both for backward compatibility.

Logs (optional)

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Additional context (optional)

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