Each interceptor chain has relative merits.

**Application interceptors**

 * Don't need to worry about intermediate responses like redirects and retries.
 * Are always invoked once, even if the HTTP response is served from the cache.
 * Observe the application's original intent. Unconcerned with OkHttp-injected headers like `If-None-Match`.

        !"Transfer-Encoding".equals(fieldName, ignoreCase = true) &&
        !"Upgrade".equals(fieldName, ignoreCase = true)

    /**
     * Returns true if [fieldName] is content specific and therefore should always be used
     * from cached headers.
     */
    private fun isContentSpecificHeader(fieldName: String): Boolean =
      "Content-Length".equals(fieldName, ignoreCase = true) ||

	// Build the passed error message
	errMsg := fmt.Sprintf(msg, args...)

	tagPrinted := false

	// Print the error message: the following code takes care
	// of splitting error text and always pretty printing the
	// red banner along with the error message. Since the error
	// message itself contains some colored text, we needed
	// to use some ANSI control escapes to cursor color state

            if (b == -1) {
                return null;
            }
            this.sbuf[35] = (byte) b;
        }

        /*
         * Unless key returned is null or invalid Transport.loop() always
         * calls doRecv() after and no one else but the transport thread
         * should call doRecv(). Therefore it is ok to expect that the data
         * in sbuf will be preserved for copying into BUF in doRecv().

> **NOTE:** `{1...n}` shown have 3 dots! Using only 2 dots `{1..n}` will be interpreted by your shell and won't be passed to MinIO server, affecting the erasure coding order, which would impact performance and high availability. **Always use ellipses syntax `{1...n}` (3 dots!) for optimal erasure-code distribution**

### Expanding existing distributed setup

//     - http://docs.aws.amazon.com/AmazonS3/latest/dev/auth-request-sig-v2.html
// returns true if matches, false otherwise. if error is not nil then it is always false

func validateV2AuthHeader(r *http.Request) (auth.Credentials, APIErrorCode) {
	var cred auth.Credentials
	v2Auth := r.Header.Get(xhttp.Authorization)
	if v2Auth == "" {
		return cred, ErrAuthHeaderEmpty

		f.NonUTF8 = false
	default:
		// Might be UTF-8, might be some other encoding; preserve existing flag.
		// Some ZIP writers use UTF-8 encoding without setting the UTF-8 flag.
		// Since it is impossible to always distinguish valid UTF-8 from some
		// other encoding (e.g., GBK or Shift-JIS), we trust the flag.
		f.NonUTF8 = f.Flags&0x800 == 0
	}

	needUSize := f.UncompressedSize == ^uint32(0)

		}
	}

	for i, onlineDisk := range onlineDisks {
		if metaErrs[i] != nil {
			continue
		}

		meta := partsMetadata[i]
		if meta.Deleted || meta.IsRemote() {
			continue
		}

		// Always check data, if we got it.
		if (len(meta.Data) > 0 || meta.Size == 0) && len(meta.Parts) > 0 {
			checksumInfo := meta.Erasure.GetChecksumInfo(meta.Parts[0].Number)
			verifyErr := bitrotVerify(bytes.NewReader(meta.Data),

		}
		if !isUpdate && subSysTargetsSet.Contains(cfgTarget) {
			return ErrAdminConfigIDPCfgNameAlreadyExists
		}

		return ErrNone
	}

	// For the default configuration name, since it will always be an available
	// target, we need to check if a configuration value has been set previously
	// to figure out if this is a valid create or update API call.

	dm1 := NewDRWMutex(ds, "aap")
	dm2 := NewDRWMutex(ds, "noot")

	dm1.Lock(id, source)
	dm2.Lock(id, source)
	dm1.Unlock(t.Context())
	dm2.Unlock(t.Context())
}

// Test refreshing lock - refresh should always return true
func TestSuccessfulLockRefresh(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping test in short mode.")
	}

	dm := NewDRWMutex(ds, "aap")
	dm.refreshInterval = testDrwMutexRefreshInterval