* Initializes the HTTP client with the necessary configurations and settings.
    * This method sets up the request configurations, authentication schemes,
    * user agent, proxy settings, request headers, cookie store, and connection manager.
    * It also processes form-based authentication schemes and sets up the HTTP client context.
    */
    @Override
    public synchronized void init() {
        if (httpClient != null) {

    * Initializes the HTTP client with the necessary configurations and settings.
    * This method sets up the request configurations, authentication schemes,
    * user agent, proxy settings, request headers, cookie store, and connection manager.
    * It also processes form-based authentication schemes and sets up the HTTP client context.
    */
    @Override
    public synchronized void init() {
        if (httpClient != null) {

    /**
     * @param scheme either "http" or "https".
     */
    fun scheme(scheme: String) =
      apply {
        when {
          scheme.equals("http", ignoreCase = true) -> this.scheme = "http"
          scheme.equals("https", ignoreCase = true) -> this.scheme = "https"
          else -> throw IllegalArgumentException("unexpected scheme: $scheme")
        }
      }

    public void test_normalizeCanonicalUrl_withCustomSchemeRelative() throws Exception {
        final FessXpathTransformer transformer = new FessXpathTransformer();
        // URI→URL migration: java.net.URL rejects unknown schemes like javascript:
        final String value = transformer.normalizeCanonicalUrl("http://example.com/", "javascript:void(0)");
        // normalizeCanonicalUrl catches MalformedURLException and returns null

                                "content": {
                                    "application/json": {
                                        "schema": {
                                            "$ref": "#/components/schemas/HTTPValidationError"
                                        }
                                    }
                                },
                            },

                                "description": "Successful Response",
                                "content": {
                                    "application/json": {
                                        "schema": {"$ref": "#/components/schemas/User"}
                                    }
                                },
                            }
                        },
                    }
                },

                        },
                    },
                    "Body_baz_post_router": {
                        "title": "Body_baz_post_router",
                        "required": ["item1", "item2"],
                        "type": "object",
                        "properties": {
                            "item1": {"$ref": "#/components/schemas/Item"},

          ).hostnameVerifier(RecordingHostnameVerifier())
          .build()
      scheme = "https"
    } else {
      server.protocols = listOf(Protocol.H2_PRIOR_KNOWLEDGE)
      client =
        clientTestRule
          .newClientBuilder()
          .protocols(listOf(Protocol.H2_PRIOR_KNOWLEDGE))
          .build()
      scheme = "http"
    }
  }

  @AfterEach fun tearDown() {

    builder.add("", "pin1", "pin2")
  }

  @Test
  fun challenge() {
    var challenge = Challenge("", mapOf("" to ""))
    challenge = Challenge("", "")
    val scheme: String = challenge.scheme
    val authParams: Map<String?, String> = challenge.authParams
    val realm: String? = challenge.realm
    val charset: Charset = challenge.charset

        .newBuilder()
        .scheme("https")
        .build()
        .port,
    ).isEqualTo(443)
    assertThat(
      parse("https://example.com")
        .newBuilder()
        .scheme("http")
        .build()
        .port,
    ).isEqualTo(80)
    assertThat(
      parse("https://example.com:1234")
        .newBuilder()
        .scheme("http")
        .build()
        .port,