if ok {
		return v[0]
	}

	// We couldn't find 'X-Amz-Content-Sha256'.
	return defaultSha256Cksum
}

// isValidRegion - verify if incoming region value is valid with configured Region.
func isValidRegion(reqRegion string, confRegion string) bool {
	if confRegion == "" {
		return true
	}
	if confRegion == "US" {
		confRegion = globalMinioDefaultRegion
	}

 - CallStart 
 - **CacheMiss**
 - ProxySelectStart
 - ... Standard Events ...
 - CallEnd
        
### Conditional Cache Hit
 
When cache flags require checking the cache results are still valid an early cacheConditionalHit event is
received followed by a cache hit or miss.  Critically in the cache hit scenario the server won’t send the response body.

    }

    @Nested
    class ConstructorTests {

        @Test
        public void testConstructorWithValidUrl() throws MalformedURLException {
            // Test basic constructor with a valid SMB URL
            String url = "smb1://server/share/file.txt";
            SmbFile smbFile = new SmbFile(url);
            assertNotNull(smbFile);
            assertEquals("smb1://server/share/file.txt", smbFile.getPath());

            // Mock initial receive with valid PDU header
            when(mockSmbPipeHandleInternal.recv(buf, 0, buf.length)).thenAnswer(invocation -> {
                byte[] buffer = invocation.getArgument(0);
                buffer[0] = 5; // Valid PDU version
                buffer[1] = 0; // Valid PDU type
                Encdec.enc_uint16le((short) 50, buffer, 8); // Fragment length

		mkParams("111", true, false),
		mkParams("111", false, true),
		// Valid cases follow
		mkParams("", true, false),
		mkParams("", false, true),
		mkParams("", false, false),
		mkParams("111", false, false),
	}
	varsArr := []map[string]string{
		// Invalid cases
		{mgmtPrefix: "objprefix"},
		// Valid cases
		{},
		{mgmtBucket: "bucket"},
		{mgmtBucket: "bucket", mgmtPrefix: "objprefix"},

     * not accepted, an <code>SmbAuthException</code> will be thrown. If an error
     * occurs an <code>SmbException</code> will be thrown. If the credentials are
     * valid, the method will return without throwing an exception. See the
     * last <a href="../../../faq.html">FAQ</a> question.
     * <p>
     * See also the <code>jcifs.smb.client.logonShare</code> property.
     *

        }

        @Override
        public boolean refresh() {
            // MSAL4J handles token refresh internally through silent authentication
            // Check if token is still valid by comparing absolute timestamps
            final long tokenExpiryTime = authResult.expiresOnDate().getTime(); // milliseconds since epoch

        // Invalid regex pattern should be handled gracefully
        urlFilter.addInclude(".*[invalid");
        urlFilter.addInclude("https://valid.com/.*");

        // Valid pattern should still work
        assertTrue(urlFilter.match("https://valid.com/page"));
    }

    /**
     * Test adding a single exclude pattern
     */
    public void test_addExclude_singlePattern() {

  }

  /**
   * Associates the value {@code null} with the specified keys, assuming both keys are valid. If
   * either key is null or isn't among the keys provided during construction, this method has no
   * effect.
   *
   * <p>This method is equivalent to {@code put(rowKey, columnKey, null)} when both provided keys
   * are valid.
   *
   * @param rowKey row key of mapping to be erased

  @Test public void getFailsWithoutAdditionalCert() throws IOException {
    OkHttpClient client = new OkHttpClient();

    boolean androidMorEarlier = Build.VERSION.SDK_INT <= 23;
    try {
      sendRequest(client, "https://valid-isrgrootx1.letsencrypt.org/robots.txt");
      if (androidMorEarlier) {
        fail();
      }
    } catch (SSLHandshakeException sslhe) {
      assertTrue(androidMorEarlier);
    }
  }