}
    }

    @Nested
    @DisplayName("Upgrade Path Validation")
    class UpgradePathValidationTests {

        @ParameterizedTest(name = "from {0} to {1}")
        @MethodSource("provideValidPathUpgradeVersions")
        @DisplayName("should validate upgrade path")
        void shouldValidateUpgradePath(String from, String to) {

    private const val UPGRADE = "upgrade"

    /** See http://tools.ietf.org/html/draft-ietf-httpbis-http2-09#section-8.1.3. */
    private val HTTP_2_SKIPPED_REQUEST_HEADERS =
      immutableListOf(
        CONNECTION,
        HOST,
        KEEP_ALIVE,
        PROXY_CONNECTION,
        TE,
        TRANSFER_ENCODING,
        ENCODING,
        UPGRADE,
        TARGET_METHOD_UTF8,

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * Integration tests for the complete upgrade workflow.
 * These tests verify end-to-end behavior with real strategy implementations.
 */
@DisplayName("Upgrade Workflow Integration")
class UpgradeWorkflowIntegrationTest {

    @TempDir
    Path tempDir;

    private Apply applyGoal;
    private Check checkGoal;

    private
    lateinit var selected: String

    private
    var upgrade: String? = null

    internal
    fun configure(components: ComponentMetadataHandler, configurations: ConfigurationContainer) {
        if (upgrade != null) {
            configurations.forceUpgrade(selected, upgrade!!)
        } else {
            providedBy.forEachIndexed { idx, provider ->

          request()
            .header("Connection", "Upgrade")
            .header("Upgrade", "websocket")
            .header("Sec-WebSocket-Key", "abc123")
            .build(),
        ).execute()
    response.body.close()
    networkLogs
      .assertLogEqual("--> GET $url http/1.1")
      .assertLogEqual("Connection: Upgrade")
      .assertLogEqual("Upgrade: websocket")
      .assertLogEqual("Sec-WebSocket-Key: abc123")

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

/**
 * Implementation of the Maven Upgrade tool ({@code mvnup}).
 *
 * <p>This package contains the implementation classes for the Maven upgrade tool,
 * providing functionality for upgrading Maven projects and dependencies.</p>
 *
 * @since 4.0.0
 */

   [Gradle plugin][japicmp_gradle] to enforce binary compatibility.

 * **Java source compatibility** is the ability to upgrade Java uses of OkHttp 3.x to 4.x without
   changing `.java` files.

 * **Kotlin source compatibility** is the ability to upgrade Kotlin uses of OkHttp 3.x to 4.x
   without changing `.kt` files.

With a few small exceptions (below), OkHttp 4.x is both binary- and Java source-compatible with

    assertThat(recorded.headers["Accept-Encoding"]).isNull() // No built-in gzip.
    assertThat(recorded.headers["Connection"]).isEqualTo("Upgrade, HTTP2-Settings")
    assertThat(recorded.headers["HTTP2-Settings"]).isNotNull()
    assertThat(recorded.headers["Upgrade"]).isEqualTo("h2c") // HTTP/2 over plaintext!
    assertThat(recorded.headers["User-Agent"]!!).matches(Regex("Java-http-client/.*"))
  }

            proxy_connect_timeout 300;
            
            # To support websocket
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            chunked_transfer_encoding off;

            proxy_pass http://console;
        }
    }

            proxy_connect_timeout 300;
            
            # To support websocket
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            chunked_transfer_encoding off;

            proxy_pass http://console;
        }
    }