}

            request.setToolchains(groupedToolchains);
        }
        return request;
    }

    @Override
    public MavenExecutionRequest populateDefaults(MavenExecutionRequest request)
            throws MavenExecutionRequestPopulationException {
        baseDirectory(request);

        localRepository(request);

        populateDefaultPluginGroups(request);

        return request;
    }

A "middleware" is a function that works with every **request** before it is processed by any specific *path operation*. And also with every **response** before returning it.

* It takes each **request** that comes to your application.
* It can then do something to that **request** or run any needed code.
* Then it passes the **request** to be processed by the rest of the application (by some *path operation*).

    }

    /**
     * Calls the static {@link #authenticate(HttpServletRequest,
     * HttpServletResponse, byte[])} method to perform NTLM authentication
     * for the specified servlet request.
     *
     * @param req The request being serviced.
     * @param resp The response.
     * @param challenge The domain controller challenge.
     * @throws IOException If an IO error occurs.

@Experimental
@Immutable
public interface RepositoryAwareRequest extends Request<Session> {

    /**
     * Returns the list of remote repositories to be used for this request.
     *
     * <p>If this method returns {@code null}, the session's default remote repositories
     * will be used. If a non-null list is returned, it will be used instead of the
     * session's repositories, allowing for request-specific repository configuration.
     *

 *   <li>Creating a {@link PopularWordsResponse} from the OpenSearch search response.</li>
 * </ul>
 *
 * @see Request
 * @see PopularWordsResponse
 */
public class PopularWordsRequest extends Request<PopularWordsResponse> {
    /**
     * Constructs a new popular words request.
     */
    public PopularWordsRequest() {
        // nothing
    }

    private String index = null;

    assertThat(request.url.toString()).isEqualTo("http://example.com/")
    assertThat(request.body!!.contentLength()).isEqualTo(3)
  }

  @Test
  fun dataPost() {
    val request = fromArgs("-d", "foo", "http://example.com").createRequest()
    val body = request.body
    assertThat(request.method).isEqualTo("POST")
    assertThat(request.url.toString()).isEqualTo("http://example.com/")

                return retrieve(request.getArtifact(), request.getLocalRepository(), request.getRemoteRepositories());
            }

            @Override
            public List<ArtifactVersion> retrieveAvailableVersions(MetadataResolutionRequest request) {
                return retrieveAvailableVersions(

              println("Negotiated " + sslSocket.applicationProtocol)
            }
          },
        ).build()

    val request =
      Request
        .Builder()
        .url("https://www.google.com")
        .build()
    client.newCall(request).execute().use { response ->
      assertThat(response.code).isEqualTo(200)
    }
  }

        request.requestType(ModelBuilderRequest.RequestType.BUILD_CONSUMER);
        request.session(iSession);
        request.source(src);
        request.locationTracking(false);
        request.systemProperties(session.getSystemProperties());
        request.userProperties(session.getUserProperties());

  }

  /** When the browser hits the redirect URL, use the provided code to ask Slack for a session. */
  @Override public MockResponse dispatch(RecordedRequest request) {
    HttpUrl requestUrl = mockWebServer.url(request.getPath());
    String code = requestUrl.queryParameter("code");
    String stateString = requestUrl.queryParameter("state");