assertEquals("::1", HostAndPort.fromString("[::1]:80").requireBracketsForIPv6().getHost());
    // Non-bracketed non-IPv6 works fine.
    assertEquals("x", HostAndPort.fromString("x").requireBracketsForIPv6().getHost());
    assertEquals("x", HostAndPort.fromString("x:80").requireBracketsForIPv6().getHost());

    // Non-bracketed IPv6 fails.
    assertThrows(

    assertEquals("::1", HostAndPort.fromString("[::1]:80").requireBracketsForIPv6().getHost());
    // Non-bracketed non-IPv6 works fine.
    assertEquals("x", HostAndPort.fromString("x").requireBracketsForIPv6().getHost());
    assertEquals("x", HostAndPort.fromString("x:80").requireBracketsForIPv6().getHost());

    // Non-bracketed IPv6 fails.
    assertThrows(

        ftpInfo = new FtpClient.FtpInfo(value, Constants.UTF_8);
        assertEquals(value, ftpInfo.toUrl());
        assertEquals("123.123.123.123:9999", ftpInfo.getCacheKey());
        assertEquals("123.123.123.123", ftpInfo.getHost());
        assertEquals(9999, ftpInfo.getPort());
        assertEquals("/", ftpInfo.getParent());
        assertNull(ftpInfo.getName());

        value = "ftp://123.123.123.123/test.txt";

            final AuthScheme authScheme = authentication.getAuthScheme();
            if (authScope.getHost() != null && authScheme != null) {
                final HttpHost targetHost = new HttpHost(authScope.getHost(), authScope.getPort());
                authCache.put(targetHost, authScheme);
            }
        }

        httpClientContext.setAuthCache(authCache);

         */
        protected GcsURLConnection(final URL url) {
            super(url);
            // Extract bucket name from host
            bucketName = url.getHost() != null ? url.getHost() : StringUtil.EMPTY;
            // Extract object name from path, removing leading slash if present and decoding URL encoding
            final String path = url.getPath();

         */
        public String getCacheKey() {
            return getHost() + ":" + getPort();
        }

        /**
         * Gets the host name from the FTP URL.
         *
         * @return The host name
         */
        public String getHost() {
            return uri.getHost();
        }

        /**
         * Gets the port number from the FTP URL.

         * @param url The S3 URL to connect to
         */
        protected S3URLConnection(final URL url) {
            super(url);
            // Extract bucket name from host
            bucketName = url.getHost() != null ? url.getHost() : StringUtil.EMPTY;
            // Extract object name from path, removing leading slash if present and decoding URL encoding
            final String path = url.getPath();

         */
        protected StorageURLConnection(final URL url) {
            super(url);
            // Extract bucket name from host
            bucketName = url.getHost() != null ? url.getHost() : StringUtil.EMPTY;
            // Extract object name from path, removing leading slash if present and decoding URL encoding
            final String path = url.getPath();

        if (StringUtil.isBlank(url) || url.startsWith("file:")) {
            // not target
            return;
        }

        try {
            final URI uri = new URI(url);
            final String host = uri.getHost();
            if (host == null) {
                return;
            }

            // Atomically get or create the AtomicLong for this host using Cache.get()

type objectAPIHandlers struct {
	ObjectAPI func() ObjectLayer
}

// getHost tries its best to return the request host.
// According to section 14.23 of RFC 2616 the Host header
// can include the port number if the default value of 80 is not used.
func getHost(r *http.Request) string {
	if r.URL.IsAbs() {
		return r.URL.Host
	}
	return r.Host
}