But you still need to define what is the dependable, the callable that you pass as a parameter to `Depends()` or `Security()`.

There are multiple tools that you can use to create those dependables, and they get integrated into OpenAPI so they are shown in the automatic docs UI, they can be used by automatically generated clients and SDKs, etc.

You can import them from `fastapi.security`:

```python

_T = TypeVar("_T")


@asynccontextmanager
async def contextmanager_in_threadpool(
    cm: ContextManager[_T],
) -> AsyncGenerator[_T, None]:
    # blocking __exit__ from running waiting on a free thread
    # can create race conditions/deadlocks if the context manager itself
    # has its own internal pool (e.g. a database connection pool)
    # to avoid this we let __exit__ run without a capacity limit

from fastapi import Depends, FastAPI, HTTPException

app = FastAPI()


data = {
    "plumbus": {"description": "Freshly pickled plumbus", "owner": "Morty"},
    "portal-gun": {"description": "Gun to create portals", "owner": "Rick"},
}


class OwnerError(Exception):
    pass


def get_username():
    try:
        yield "Rick"
    except OwnerError as e:

from fastapi import FastAPI

description = """
ChimichangApp API helps you do awesome stuff. 🚀

## Items

You can **read items**.

## Users

You will be able to:

* **Create users** (_not implemented_).
* **Read users** (_not implemented_).
"""

app = FastAPI(
    title="ChimichangApp",
    description=description,
    summary="Deadpool's favorite app. Nuff said.",
    version="0.0.1",

    private final int lineNumber;

    private final int columnNumber;

    private final String message;

    private final Exception exception;

    private final Severity severity;

    /**
     * Creates a new problem with the specified message and exception.
     * Either {@code message} or {@code exception} is required
     *
     * @param message The message describing the problem, may be {@code null}.

# And you can use it to view objects too.
#
# If local column name is same as foreign column name,
# you can omit the setting of localColumnName and foreignColumnName.
# The names are treated as case insensitive.
#
# Example:
# map:{
#     ; FK_MEMBER_MEMBER_STATUS_CODE = map:{
#         ; localTableName  = MEMBER             ; foreignTableName  = MEMBER_STATUS

public class CreateForm {

    @ValidateTypeFailure
    public Integer crudMode;

    public Map<String, Object> doc;

    public String q;

    public void initialize() {
        crudMode = CrudMode.CREATE;
    }

@GwtIncompatible
public class CompactHashMapFloodingTest extends AbstractHashFloodingTest<Map<Object, Object>> {
  public CompactHashMapFloodingTest() {
    super(
        ImmutableList.of(Construction.mapFromKeys(CompactHashMap::create)),
        n -> n * log(n),
        ImmutableList.of(QueryOp.MAP_GET));
  }

@GwtIncompatible
public class CompactHashSetFloodingTest extends AbstractHashFloodingTest<Set<Object>> {
  public CompactHashSetFloodingTest() {
    super(
        ImmutableList.of(Construction.setFromElements(CompactHashSet::create)),
        n -> n * log(n),
        ImmutableList.of(QueryOp.SET_CONTAINS));
  }

 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.smb2.create;


import jcifs.Decodable;


/**
 * @author mbechler
 *
 */
public interface CreateContextResponse extends Decodable {

    /**
     * @return context name
     */