ETag Verification

Validate cached content using the ETag response header so the CDN can detect when the origin object has changed.

ETag Verification ensures that cached objects remain consistent with the latest version served by the origin. When enabled, the CDN evaluates the ETag header returned by the origin and refreshes the cached object when a mismatch is detected. This prevents outdated or stale content from being delivered to end users.

You can manage ETag Verification in the Medianova Control Panel or via API.

Select a CDN resource in the CDN section, and navigate to the Caching tab.

Configure ETag Verification

Enable or disable ETag validation to ensure cached content remains synchronized with the origin.

1

Access the ETag Verification Section

Open the ETag Verification section under the Caching tab of the selected CDN resource.

2

Toggle ETag Verification

Enable or disable ETag validation using the ETag Verification toggle.

3

Submit the Configuration

Click Submit to apply the updated validation behavior.

Behaviour

• When enabled, the CDN compares the origin’s ETag header with the cached object to determine whether a refresh is required.

• When disabled, cached objects are served without ETag-based validation.

• ETag validation improves consistency but may result in more origin requests depending on header behavior.

FAQ

Does ETag Verification guarantee that the CDN always serves the latest version? Yes. When enabled, the CDN validates the cached object using the ETag header and refreshes it if the origin indicates a change.

Does enabling ETag Verification increase origin traffic? It can. Validation requires comparing ETag values, which may trigger additional revalidation requests depending on origin behavior.

What happens if the origin does not send an ETag header? The CDN cannot perform ETag-based validation. Normal cache expiration and revalidation rules apply.