public java.util.List<
            ? extends com.google.cloud.websecurityscanner.v1beta.VulnerableHeaders.HeaderOrBuilder>
        getMissingHeadersOrBuilderList() {
      if (missingHeadersBuilder_ != null) {
        return missingHeadersBuilder_.getMessageOrBuilderList();
      } else {
        return java.util.Collections.unmodifiableList(missingHeaders_);
      }
    }
<pre>
List of missing headers.
</pre>

<code>
repeated .google.cloud.websecurityscanner.v1beta.VulnerableHeaders.Header missing_headers = 2;
</code>
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1beta/src/main/java/com/google/cloud/websecurityscanner/v1beta/VulnerableHeaders.java