# Custom Response Classes - File, HTML, Redirect, Streaming, etc.

There are several custom response classes you can use to create an instance and return them directly from your *path operations*.

Read more about it in the [FastAPI docs for Custom Response - HTML, Stream, File, others](https://fastapi.tiangolo.com/advanced/custom-response/).

You can import them directly from `fastapi.responses`:

```python
from fastapi.responses import (
    FileResponse,

#
# To prepare an update for a new Go release,
# consult https://www.iana.org/time-zones for the latest versions,
# update CODE and DATA below, and then run
#
#	./update.bash -commit
#
# That will prepare the files and create the commit.
#
# To review such a commit (as the reviewer), use:
#
#	git codereview change NNNNNN   # CL number
#	cd lib/time
#	./update.bash
#
# If it prints "No updates needed.", then the generated files

func (ge ErrConfigGeneric) Error() string {
	return ge.msg
}

// ErrConfigNotFound is an error to indicate
// that a config parameter is not found
type ErrConfigNotFound struct {
	ErrConfigGeneric
}

// Error creates an error message and wraps
// it with the error type specified in the type parameter
func Error[T ErrorConfig, PT interface {
	*T
	setMsg(string)
}](format string, vals ...any,
) T {
	pt := PT(new(T))

    /** Map storing MIME type to file type mappings */
    protected Map<String, String> mimetypeMap = new LinkedHashMap<>();

    /**
     * Default constructor for file type helper.
     * Creates a new instance with default values.
     */
    public FileTypeHelper() {
        // Default constructor
    }

    /**
     * Initializes the file type mappings by loading configuration from Fess settings.

import java.text.DecimalFormatSymbols;
import java.util.Locale;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.text.DecimalFormatSymbolsUtil;

/**
 * Utility class for conversions related to {@link Number}.
 *
 * @author higa
 */
public abstract class NumberConversionUtil {

    /**
     * Do not instantiate.
     */
    protected NumberConversionUtil() {
    }

    /**

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.netbios;

import jcifs.CIFSException;

/**
 * NetBIOS exception class for NBT-related errors.
 *
 * This exception encapsulates NetBIOS name service and session service errors
 * with specific error classes and codes.
 */
public class NbtException extends CIFSException {

    /**
     *
     */

    private byte typeOfLock;
    private byte newOpLockLevel;
    private long timeout;
    private LockingAndXRange[] locks;
    private LockingAndXRange[] unlocks;
    private boolean largeFile;

    /**
     * Creates a new SMB1 locking request for file byte-range locking operations.
     *
     * @param config the CIFS configuration
     */
    public SmbComLockingAndX(final Configuration config) {
        super(config);
    }

 * Authentication Scheme for HTTP</A>.
 * <p>
 * Also, read <a
 * href="../../../ntlmhttpauth.html">jCIFS NTLM HTTP Authentication and
 * the Network Explorer Servlet</a> related information.
 */
@Deprecated
public class NtlmSsp implements NtlmFlags {

    /**
     * Default constructor.
     */
    public NtlmSsp() {
        // Default constructor
    }

    /**

    // ----------------/
    // - Constructors -/
    // ----------------/

    /**
     * Default constructor for InputSource.
     */
    public InputSource() {}

    /**
     * Creates a new InputSource from an API model InputSource.
     * This constructor is used for converting between the API model and the compat model.
     *
     * @param source the API model InputSource to convert from
     */

### Tags with Enums { #tags-with-enums }

If you have a big application, you might end up accumulating **several tags**, and you would want to make sure you always use the **same tag** for related *path operations*.

In these cases, it could make sense to store the tags in an `Enum`.

**FastAPI** supports that the same way as with plain strings: