Das ist keine Limitation von **FastAPI**, sondern Teil des HTTP-Protokolls.

///

## Optionaler Datei-Upload { #optional-file-upload }

Sie können eine Datei optional machen, indem Sie Standard-Typannotationen verwenden und den Defaultwert auf `None` setzen:

{* ../../docs_src/request_files/tutorial001_02_an_py310.py hl[9,17] *}

## `UploadFile` mit zusätzlichen Metadaten { #uploadfile-with-additional-metadata }

 * implement subtleties of the API improperly.
 *
 * <p><b>Custom implementation</b>: Avoid implementing {@code ListenableFuture} from scratch. If you
 * can't get by with the standard implementations, prefer to derive a new {@code Future} instance
 * with the methods in {@link Futures} or, if necessary, to extend {@link AbstractFuture}.
 *

 * implement subtleties of the API improperly.
 *
 * <p><b>Custom implementation</b>: Avoid implementing {@code ListenableFuture} from scratch. If you
 * can't get by with the standard implementations, prefer to derive a new {@code Future} instance
 * with the methods in {@link Futures} or, if necessary, to extend {@link AbstractFuture}.
 *

        byte[] key = "key".getBytes();
        byte[] data = "The quick brown fox jumps over the lazy dog".getBytes();

        // Calculate expected HMAC-MD5 using standard Java MessageDigest for comparison
        // This is a simplified HMAC-MD5 calculation for comparison, not a full RFC 2104 implementation.
        // The HMACT64 implementation is what we are testing.

        CONFIGURATION,
        /** Transient errors that may succeed on retry */
        TRANSIENT,
        /** Unknown or unclassified errors */
        UNKNOWN
    }

    /**
     * Standard SMB error codes
     */
    public enum ErrorCode {
        // Network errors
        CONNECTION_FAILED("Network connection failed", ErrorCategory.NETWORK, true), CONNECTION_TIMEOUT("Connection timed out",

Por ejemplo, estaba claro que idealmente debería estar basado en las anotaciones de tipos estándar de Python.

También, el mejor enfoque era usar estándares ya existentes.

        // Given - typical Iterator usage pattern

        // When & Then - verify empty collection behavior
        assertFalse(emptyIterator.hasNext(), "Empty iterator should have no next element");

        // Note: Standard Iterator would throw NoSuchElementException, but this implementation returns null
        // This is a design choice for this specific implementation

    public static final int FILE_READ_ATTRIBUTES = 0x00000080; // 8
    /** Permission to write file attributes */
    public static final int FILE_WRITE_ATTRIBUTES = 0x00000100; // 9
    /** Standard delete permission */
    public static final int DELETE = 0x00010000; // 16
    /** Permission to read the security descriptor */
    public static final int READ_CONTROL = 0x00020000; // 17

![ReDoc](https://fastapi.tiangolo.com/img/index/index-02-redoc-simple.png)

### OpenAPI { #openapi }

**FastAPI** genera un "esquema" con toda tu API utilizando el estándar **OpenAPI** para definir APIs.

#### "Esquema" { #schema }

Un "esquema" es una definición o descripción de algo. No el código que lo implementa, sino solo una descripción abstracta.

import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.function.UnaryOperator;

import org.apache.maven.impl.model.DefaultInterpolator;

/**
 * Enhancement of the standard <code>Properties</code>
 * managing the maintain of comments, etc.
 */
public class MavenProperties extends AbstractMap<String, String> {

    /** Constant for the supported comment characters.*/