There was also an "OpenID" specification. That tried to solve the same thing as **OpenID Connect**, but was not based on OAuth2.

So, it was a complete additional system.

It is not very popular or used nowadays.

## OpenAPI { #openapi }

OpenAPI (previously known as Swagger) is the open specification for building APIs (now part of the Linux Foundation).

        """
        The OAuth 2 specification doesn't define the challenge that should be used,
        because a `Bearer` token is not really the only option to authenticate.

        But declaring any other authentication challenge would be application-specific
        as it's not defined in the specification.

        For practical reasons, this method uses the `Bearer` challenge by default, as

   * specification.
   *
   * <p>This escaper substitutes {@code 0xFFFD} for non-whitespace control characters and the
   * character values {@code 0xFFFE} and {@code 0xFFFF} which are not permitted in XML. For more
   * detail see section <a href="http://www.w3.org/TR/2008/REC-xml-20081126/#charsets">2.2</a> of
   * the XML specification.
   *

* <a href="https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.1.0.md#parameter-object" class="external-link" target="_blank">`Parameter Object` (in the specification)</a> that was used by FastAPI's:
    * `Path()`
    * `Query()`
    * `Header()`
    * `Cookie()`

/**
 * Base class for SMB Witness Protocol RPC messages as defined in MS-SWN specification.
 * This class extends DcerpcMessage to provide witness-specific RPC operations.
 */
public abstract class WitnessRpcMessage extends DcerpcMessage {

    // MS-SWN Witness Protocol Interface UUID and Version
    /** Witness Protocol Interface UUID from MS-SWN specification */

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package gradlebuild.buildutils.tasks

import spock.lang.Specification

class UpdateKotlinVersionsTest extends Specification {

    def previousVersions = [
        "1.9.10", "1.9.25", "1.9.24", "1.9.20", "1.9.20-RC2", "1.9.0", "1.9.0-Beta",
        "1.8.22, 1.8.0, 1.8.0-Beta",
    ]

As you see, the method names now have the tag and then the function name, now they don't include information from the URL path and the HTTP operation.

### Preprocess the OpenAPI Specification for the Client Generator { #preprocess-the-openapi-specification-for-the-client-generator }

The generated code still has some **duplicated information**.

import japicmp.model.JApiClass
import javassist.ClassPool
import me.champeau.gradle.japicmp.report.ViolationCheckContext
import spock.lang.Specification
import spock.lang.TempDir

abstract class AbstractContextAwareRuleSpecification extends Specification {
    @TempDir
    File testDir

    ViolationCheckContext context = new ViolationCheckContext() {
        Map userData = [seenApiChanges: [] as Set]

 generally generated from plugin sources using {{{/plugin-tools/maven-plugin-plugin/}maven-plugin-plugin}}.

* See Also

 * {{{/developers/mojo-api-specification.html}Mojo API Specification}}

 * {{{/plugin-tools/}Plugin Tools}} that provide {{{/plugin-tools/maven-plugin-plugin/}maven-plugin-plugin}} to generate the {{{./plugin.html}<<<META-INF/maven/plugin.xml>>> plugin descriptor}}

 * limitations under the License.
 */

package gradlebuild.buildutils.tasks

import org.gradle.util.GradleVersion
import org.gradle.util.internal.VersionNumber
import spock.lang.Specification

class UpdateAgpVersionsTest extends Specification {

    def "selects matching gradle major versions when stable or rc available (minimumSupported=#minimumSupported)"() {
        given:
        def gradleVersion = GradleVersion.version("9.2")