VAST-2.0-url-empty: URL field is empty

Q: How do I fix VAST-2.0-url-empty?

Populate the URL field with a valid `https://` URL, or remove the empty element.

Q: What does the VAST error "URL field is empty" mean?

A URL field (` `, ` `, ` `, etc.) was present but contained no value. An empty URL cannot be fetched or navigated to and will cause that feature to silently fail.

VAST-2.0-url-empty

URL field is empty

ErrorSecurityIAB VAST 2.0 §2VAST 2.0 and later (all versions)

Short answer

A URL field (<Impression>, <ClickThrough>, <MediaFile>, etc.) was present but contained no value. An empty URL cannot be fetched or navigated to and will cause that feature to silently fail.

Why this matters in production

This rule is usually a delivery blocker. Many players, SDKs, and ad servers will discard the response or skip the affected creative once this condition is hit. Security rules show up most often on mobile, CTV, and browser runtimes that enforce HTTPS, mixed-content blocking, or stricter asset loading than desktop test environments. Affected scope: VAST 2.0 and later (all versions).

How to fix

Populate the URL field with a valid https:// URL, or remove the empty element.

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Other Security rules

VAST-2.0-mediafile-https<MediaFile> URL uses HTTP instead of HTTPS VAST-2.0-tracking-httpsTracking or click URL uses HTTP instead of HTTPS VAST-2.0-url-invalidURL field does not appear to be a valid URI

VAST-2.0-url-empty

Why this matters in production

Related docs

Other Security rules