PartNumber          int                 // only useful in case of GetObject/HeadObject
	CheckPrecondFn      CheckPreconditionFn // only set during GetObject/HeadObject/CopyObjectPart preconditional valuation
	EvalMetadataFn      EvalMetadataFn      // only set for retention settings, meant to be used only when updating metadata in-place.

	TooBigDecodedLength
	BadSignature
	BadMD5
	MissingUploadID
)

// Wrapper for calling HeadObject API handler tests for both Erasure multiple disks and FS single drive setup.
func TestAPIHeadObjectHandler(t *testing.T) {
	ExecObjectLayerAPITest(ExecObjectLayerAPITestArgs{t: t, objAPITest: testAPIHeadObjectHandler, endpoints: []string{"HeadObject"}})
}

		case "PostPolicy":
			// Register PostPolicy handler.
			bucket.Methods(http.MethodPost).HeadersRegexp("Content-Type", "multipart/form-data*").HandlerFunc(api.PostPolicyBucketHandler)
		case "HeadObject":
			// Register HeadObject handler.
			bucket.Methods("Head").Path("/{object:.+}").HandlerFunc(api.HeadObjectHandler)
		case "GetObject":
			// Register GetObject handler.

				rinfo.ReplicationAction = rAction
				rinfo.ReplicationStatus = replication.Completed
			}
			return
		}
	} else {
		// SSEC objects will refuse HeadObject without the decryption key.
		// Ignore the error, since we know the object exists and versioning prevents overwriting existing versions.

// -----------
// The HEAD operation retrieves metadata from an object without returning the object itself.
func (api objectAPIHandlers) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "HeadObject")
	defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))

	objectAPI := api.ObjectAPI()
	if objectAPI == nil {
		writeErrorResponseHeadersOnly(w, errorCodes.ToAPIErr(ErrServerNotInitialized))
		return

        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bais);
        DictionaryExpiredException deserialized = (DictionaryExpiredException) ois.readObject();
        ois.close();

        // Verify
        assertNotNull(deserialized);
        assertNull(deserialized.getMessage());
        assertNull(deserialized.getCause());
    }

        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bais);
        SsoLoginException deserializedException = (SsoLoginException) ois.readObject();
        ois.close();

        // Verify the deserialized exception
        assertEquals(originalException.getMessage(), deserializedException.getMessage());
        assertNotNull(deserializedException.getCause());

        java.io.ObjectInputStream ois = new java.io.ObjectInputStream(bais);
        SmbOperationException deserialized = (SmbOperationException) ois.readObject();
        ois.close();

        // Then
        assertNotNull(deserialized);
        assertEquals(exception.getErrorCode(), deserialized.getErrorCode());

            for (Path handleFile : stream) {
                try (ObjectInputStream ois = new ObjectInputStream(Files.newInputStream(handleFile))) {
                    HandleInfo info = (HandleInfo) ois.readObject();

                    // Only load if not expired
                    if (!info.isExpired()) {
                        handles.put(info.getPath(), info);

            ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
            ObjectInputStream ois = new ObjectInputStream(bais);
            CrawlerStatus deserialized = (CrawlerStatus) ois.readObject();
            ois.close();

            // Verify - enum instances are singletons
            assertSame(original, deserialized);
            assertEquals(original.name(), deserialized.name());