@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
      getSerializedSize();
      if (getThreatTypesList().size() > 0) {
        output.writeUInt32NoTag(10);
        output.writeUInt32NoTag(threatTypesMemoizedSerializedSize);
      }
      for (int i = 0; i < threatTypes_.size(); i++) {
        output.writeEnumNoTag(threatTypes_.get(i));
      }
      if (!hash_.isEmpty()) {
        output.writeBytes(2, hash_);
      }
      if (((bitField0_ & 0x00000001) != 0)) {
        output.writeMessage(3, getExpireTime());
      }
      getUnknownFields().writeTo(output);
    }
<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 = 3;</code>
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/SearchHashesResponse.java