Code:       "XMinioAdminTierReserved",
		Message:    "Cannot use reserved tier name",
		StatusCode: http.StatusBadRequest,
	}
)

func (api adminAPIHandlers) AddTierHandler(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	objAPI, cred := validateAdminReq(ctx, w, r, policy.SetTierAction)
	if objAPI == nil {
		return
	}

	password := cred.SecretKey

     *            <code>null</code>.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    void injectLifecycleBindings(Model model, ModelBuildingRequest request, ModelProblemCollector problems);

And it will save the returned value in a <abbr title="A utility/system to store computed/generated values, to reuse them instead of computing them again.">"cache"</abbr> and pass it to all the "dependants" that need it in that specific request, instead of calling the dependency multiple times for the same request.

    /**
     * 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.

        final LoginCredential loginCredential = ssoManager.getLoginCredential();
        if (loginCredential == null) {
            if (logger.isDebugEnabled()) {
                logger.debug("No user in SSO request.");
            }
            if (ssoManager.available()) {
                saveError(messages -> messages.addErrorsSsoLoginError(GLOBAL));
            }
            return redirect(LoginAction.class);
        }

internal fun addHeaderLenient(
  builder: Headers.Builder,
  name: String,
  value: String,
): Headers.Builder = builder.addLenient(name, value)

internal fun cacheGet(
  cache: Cache,
  request: Request,
): Response? = cache.get(request)

internal fun applyConnectionSpec(
  connectionSpec: ConnectionSpec,
  sslSocket: SSLSocket,
  isFallback: Boolean,
) = connectionSpec.apply(sslSocket, isFallback)

   * authenticator. This gives the authenticator the option to customize the CONNECT request. It can
   * decline to do so by returning null, in which case OkHttp will use it as-is.
   */
  @Throws(IOException::class)
  private fun createTunnelRequest(route: Route): Request {
    val proxyConnectRequest =
      Request.Builder()
        .url(route.address.url)
        .method("CONNECT", null)

    val client =
      clientTestRule.newClientBuilder()
        .sslSocketFactory(clientCertificates.sslSocketFactory(), clientCertificates.trustManager)
        .build()

    val call = client.newCall(Request(server.url("/")))
    val response = call.execute()
    assertThat(response.code).isEqualTo(200)
    assertThat(response.handshake!!.cipherSuite).isNotNull()
    assertThat(response.handshake!!.tlsVersion).isNotNull()

- If the user specifies an invalid timeout in the request URL, the request will be aborted with an HTTP 400.

     *
     * @param request The version request, must not be {@code null}.
     * @return The version result, never {@code null}.
     * @throws VersionResolverException If the metaversion could not be resolved.
     */
    @Nonnull
    VersionResolverResult resolve(@Nonnull VersionResolverRequest request) throws VersionResolverException;