* @throws CIFSException if an error occurs retrieving the buffer size
     */
    int getSendBufferSize() throws CIFSException;

    /**
     * Gets the receive buffer size of the underlying SMB connection
     * @return the receive buffer size of the underlying connection
     * @throws CIFSException if an error occurs retrieving the buffer size
     */
    int getReceiveBufferSize() throws CIFSException;

    /**

# JSON with Bytes as Base64 { #json-with-bytes-as-base64 }

If your app needs to receive and send JSON data, but you need to include binary data in it, you can encode it as base64.

## Base64 vs Files { #base64-vs-files }

Consider first if you can use [Request Files](../tutorial/request-files.md) for uploading binary data and [Custom Response - FileResponse](./custom-response.md#fileresponse--fileresponse-) for sending binary data, instead of encoding it in JSON.

    /**
     * Default maximum number of receive credits
     */
    public static final int DEFAULT_RECEIVE_CREDIT_MAX = 255;

    /**
     * Default target number of send credits
     */
    public static final int DEFAULT_SEND_CREDIT_TARGET = 32;

    /**
     * Default maximum receive size (8KB)
     */
    public static final int DEFAULT_MAX_RECEIVE_SIZE = 8192;

    /**

In your WebSocket route you can `await` for messages and send messages.

{* ../../docs_src/websockets_/tutorial001_py310.py hl[48:52] *}

You can receive and send binary, text, and JSON data.

## Try it { #try-it }

Put your code in a file `main.py` and then run your application:

<div class="termy">

```console
$ fastapi dev

У `Request` є атрибут `request.scope` - це просто Python `dict`, що містить метадані, пов'язані із запитом.

Також `Request` має `request.receive` - це функція для «отримання» тіла запиту.

`scope` `dict` і функція `receive` є частиною специфікації ASGI.

І саме ці дві сутності - `scope` та `receive` - потрібні для створення нового екземпляра `Request`.

            RdmaMemoryRegion recvRegion = bufferManager.getReceiveRegion();
            assertNotNull(recvRegion, "Receive region should not be null");
            assertTrue(recvRegion.getSize() > 0, "Receive region should have positive size");
            assertNotNull(recvRegion.getBuffer(), "Receive region buffer should not be null");

            // Test buffer pooling statistics

For example, it doesn't receive `datetime` objects, as those are not compatible with JSON.

So, a `datetime` object would have to be converted to a `str` containing the data in [ISO format](https://en.wikipedia.org/wiki/ISO_8601).

The same way, this database wouldn't receive a Pydantic model (an object with attributes), only a `dict`.

You can use `jsonable_encoder` for that.

        assertNotNull(capabilities, "Capabilities should not be null");
        assertEquals(1, capabilities.size(), "TCP provider should only support send/receive");
        assertTrue(capabilities.contains(RdmaCapability.RDMA_SEND_RECEIVE), "Should support send/receive");
        assertFalse(capabilities.contains(RdmaCapability.RDMA_READ), "Should not support RDMA read");

Pour cela, **FastAPI** fournit une fonction `jsonable_encoder()`.

## Utiliser `jsonable_encoder` { #using-the-jsonable-encoder }

Imaginons que vous ayez une base de données `fake_db` qui ne reçoit que des données compatibles JSON.

Par exemple, elle ne reçoit pas d'objets `datetime`, car ceux-ci ne sont pas compatibles avec JSON.

import jcifs.internal.smb2.rdma.RdmaProvider;

/**
 * TCP fallback RDMA provider.
 *
 * This provider uses regular TCP connections but maintains the RDMA
 * interface for compatibility. It only supports send/receive operations
 * and does not provide true RDMA read/write capabilities.
 */
public class TcpRdmaProvider implements RdmaProvider {

    /**
     * Creates a new TCP RDMA provider instance
     */