public Builder mergeOidcToken(com.google.cloud.tasks.v2beta3.OidcToken value) {
      if (oidcTokenBuilder_ == null) {
        if (authorizationHeaderCase_ == 6
            && authorizationHeader_
                != com.google.cloud.tasks.v2beta3.OidcToken.getDefaultInstance()) {
          authorizationHeader_ =
              com.google.cloud.tasks.v2beta3.OidcToken.newBuilder(
                      (com.google.cloud.tasks.v2beta3.OidcToken) authorizationHeader_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          authorizationHeader_ = value;
        }
        onChanged();
      } else {
        if (authorizationHeaderCase_ == 6) {
          oidcTokenBuilder_.mergeFrom(value);
        } else {
          oidcTokenBuilder_.setMessage(value);
        }
      }
      authorizationHeaderCase_ = 6;
      return this;
    }
<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.v2beta3.OidcToken oidc_token = 6;</code>
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/HttpTarget.java