* </ul>
 *
 * <p>Invalid:
 *
 * <ul>
 *   <li>Expired: time expired (key/value may still be set)
 *   <li>Collected: key/value was partially collected, but not yet cleaned up
 *   <li>Unset: marked as unset, awaiting cleanup or reuse
 * </ul>
 */
@GwtIncompatible
interface ReferenceEntry<K, V> {
  /** Returns the value reference from this entry. */
  @Nullable ValueReference<K, V> getValueReference();

This will skip the normal events such as DNS, connecting to the network, and downloading the response body.

As recommended by the HTTP RFC the max age of a document is defaulted to 10% of the 
document's age at the time it was served based on "Last-Modified". Default expiration dates aren't used for URIs 
containing a query.

 - CallStart
 - **CacheHit**
 - CallEnd
 
### Cache Miss

{* ../../docs_src/path_operation_configuration/tutorial006.py hl[16] *}

It will be clearly marked as deprecated in the interactive docs:

<img src="/img/tutorial/path-operation-configuration/image04.png">

Check how deprecated and non-deprecated *path operations* look like:

		hdr.Size = n
	}

	// Read the sparse map according to the appropriate format.
	if is1x0 {
		return readGNUSparseMap1x0(tr.curr)
	}
	return readGNUSparseMap0x1(hdr.PAXRecords)
}

// mergePAX merges paxHdrs into hdr for all relevant fields of Header.
func mergePAX(hdr *Header, paxHdrs map[string]string) (err error) {
	for k, v := range paxHdrs {
		if v == "" {
			continue // Keep the original USTAR value
		}

    }
}
```

### Benutzerdefiniertes OpenAPI-*Pfadoperation*-Schema

Das Dictionary in `openapi_extra` wird mit dem automatisch generierten OpenAPI-Schema für die *Pfadoperation* zusammengeführt (mittels Deep Merge).

Sie können dem automatisch generierten Schema also zusätzliche Daten hinzufügen.

        }
        cookie.setSecure(isSecureCookie());
        LaResponseUtil.getResponse().addCookie(cookie);
    }

    /**
     * Determines whether the user identification cookie should be marked as secure.
     * Checks the configured secure setting or examines request headers to detect HTTPS.
     *
     * @return true if the cookie should be secure, false otherwise
     */

In this example, it would link to a CSS file at `static/styles.css` with:

```CSS hl_lines="4"
{!../../docs_src/templates/static/styles.css!}
```

And because you are using `StaticFiles`, that CSS file would be served automatically by your **FastAPI** application at the URL `/static/styles.css`.

## More details { #more-details }

    }

    /**
     * Retrieves a list of URLs that are in the user's favorites from the provided URL list.
     * This method filters the input URL list to return only those URLs that the specified user
     * has marked as favorites.
     *
     * @param userCode the unique code identifying the user
     * @param urlList the list of URLs to check against the user's favorites

  }

  /**
   * Verifies that {@code method} produces a {@link NullPointerException} or {@link
   * UnsupportedOperationException} when the parameter in position {@code paramIndex} is null. If
   * this parameter is marked nullable, this method does nothing.
   *
   * @param instance the instance to invoke {@code method} on, or null if {@code method} is static
   */

It is not very popular or used nowadays.

OAuth2 doesn't specify how to encrypt the communication, it expects you to have your application served with HTTPS.

/// tip

In the section about **deployment** you will see how to set up HTTPS for free, using Traefik and Let's Encrypt.

///

## OpenID Connect { #openid-connect }