private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tasks.v2beta2.OidcToken,
            com.google.cloud.tasks.v2beta2.OidcToken.Builder,
            com.google.cloud.tasks.v2beta2.OidcTokenOrBuilder>
        getOidcTokenFieldBuilder() {
      if (oidcTokenBuilder_ == null) {
        if (!(authorizationHeaderCase_ == 6)) {
          authorizationHeader_ = com.google.cloud.tasks.v2beta2.OidcToken.getDefaultInstance();
        }
        oidcTokenBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tasks.v2beta2.OidcToken,
                com.google.cloud.tasks.v2beta2.OidcToken.Builder,
                com.google.cloud.tasks.v2beta2.OidcTokenOrBuilder>(
                (com.google.cloud.tasks.v2beta2.OidcToken) authorizationHeader_,
                getParentForChildren(),
                isClean());
        authorizationHeader_ = null;
      }
      authorizationHeaderCase_ = 6;
      onChanged();
      return oidcTokenBuilder_;
    }
<pre>
If specified, an
[OIDC](https://developers.google.com/identity/protocols/OpenIDConnect)
token will be generated and attached as an `Authorization` header in the
HTTP request.

This type of authorization can be used for many scenarios, including
calling Cloud Run, or endpoints where you intend to validate the token
yourself.
</pre>

<code>.google.cloud.tasks.v2beta2.OidcToken oidc_token = 6;</code>
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/HttpRequest.java