extension = strings[strings.length - 1];
            } else {
                filePrefix = name;
                extension = "";
            }
        } else {
            filePrefix = "none";
            extension = "";
        }
        File inputFile = null;
        File outputFile = null;
        try {
            inputFile =

        DirectoryCacheEntry entry = directoryCache.get(directoryPath);
        if (entry == null)
            return;

        // Handle lease break by updating cache behavior
        // Only process if newState is not NONE (0) - a valid lease state
        if (newState != 0) {
            if ((newState & Smb2LeaseState.SMB2_LEASE_READ_CACHING) == 0) {
                // Lost read cache - invalidate directory cache

///

## Subida de Archivos Opcional { #optional-file-upload }

Puedes hacer un archivo opcional utilizando anotaciones de tipos estándar y estableciendo un valor por defecto de `None`:

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

## `UploadFile` con Metadatos Adicionales { #uploadfile-with-additional-metadata }

Второй аргумент <a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> - это возвращаемое по умолчанию значение.

Если значение не указано, то по умолчанию оно равно `None`. В данном случае мы указываем `«World»` в качестве значения по умолчанию.

///

Затем можно запустить эту программу на Python:

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console

可在一个*路径操作*中声明多个 `File` 和 `Form` 参数，但不能同时声明要接收 JSON 的 `Body` 字段。因为此时请求体的编码是 `multipart/form-data`，不是 `application/json`。

这不是 **FastAPI** 的问题，而是 HTTP 协议的规定。

///

## 可选文件上传

您可以通过使用标准类型注解并将 None 作为默认值的方式将一个文件参数设为可选:

{* ../../docs_src/request_files/tutorial001_02_py310.py hl[7,14] *}

## 带有额外元数据的 `UploadFile`

您也可以将 `File()` 与 `UploadFile` 一起使用，例如，设置额外的元数据:

            // TODO: This breaks the provider
            task.getInputs().dir(extractGroovyPackageListTask.map(Copy::getDestinationDir)).withPathSensitivity(PathSensitivity.NONE);
            options.linksOffline(javadocs.getGroovyApi().get().toString(), extractGroovyPackageListTask.map(Copy::getDestinationDir).get().getAbsolutePath());

            task.source(extension.getDocumentedSource()

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

### Dockerfile

现在在相同的project目录创建一个名为`Dockerfile`的文件:

```{ .dockerfile .annotate }
# (1)
FROM python:3.9

# (2)
WORKDIR /code

        .signedBy(intermediate)
        .build()
    val handshakeCertificates =
      HandshakeCertificates
        .Builder()
        .addTrustedCertificate(root.certificate) // BouncyCastle requires at least one
        .heldCertificate(certificate, intermediate.certificate)
        .build()
    assertPrivateKeysEquals(
      certificate.keyPair.private,
      handshakeCertificates.keyManager.getPrivateKey("private"),
    )

        return webConfigBhv.selectByPK(id);
    }

    /**
     * Gets a web configuration by its name.
     * If multiple configurations have the same name, returns the first one ordered by sort order.
     *
     * @param name The name of the web configuration
     * @return Optional containing the web configuration if found
     */

import jcifs.smb1.util.Hexdump;

class SmbComNTCreateAndX extends AndXServerMessageBlock {

    // share access specified in SmbFile

    // create disposition

    /* Creates a new file or supersedes the existing one
     */

    static final int FILE_SUPERSEDE = 0x0;

    /* Open the file or fail if it does not exist
     * aka OPEN_EXISTING
     */

    static final int FILE_OPEN = 0x1;