@java.lang.Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptor().hashCode();
      if (getThreatTypesCount() > 0) {
        hash = (37 * hash) + THREAT_TYPES_FIELD_NUMBER;
        hash = (53 * hash) + threatTypes_.hashCode();
      }
      if (hasExpireTime()) {
        hash = (37 * hash) + EXPIRE_TIME_FIELD_NUMBER;
        hash = (53 * hash) + getExpireTime().hashCode();
      }
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }
<pre>
The cache lifetime for the returned match. Clients must not cache this
response past this timestamp to avoid false positives.
</pre>

<code>.google.protobuf.Timestamp expire_time = 2;</code>
java-webrisk/proto-google-cloud-webrisk-v1beta1/src/main/java/com/google/webrisk/v1beta1/SearchUrisResponse.java