This is not a limitation of **FastAPI**, it's part of the HTTP protocol.

///

## Optional File Upload { #optional-file-upload }

You can make a file optional by using standard type annotations and setting a default value of `None`:

import jcifs.smb.NtStatus;

/**
 * Base class for SMB2/SMB3 response messages.
 *
 * This abstract class provides common functionality for handling
 * response messages in the SMB2/SMB3 protocol.
 *
 * @author mbechler
 */
public abstract class ServerMessageBlock2Response extends ServerMessageBlock2 implements CommonServerMessageBlockResponse {

    private boolean received;
    private boolean error;

import org.junit.jupiter.api.Test;

/**
 * Unit tests for the Trans2FindNext2 class.
 */
class Trans2FindNext2Test {

    /**
     * Verifies constructor initializes protocol fields and limits correctly.
     */
    @Test
    void testConstructorInitializesFields() {
        // Given
        int sid = 0x2222;
        int resumeKey = 0x12345678;
        String filename = "dir\\pattern*";

import jakarta.annotation.Resource;

/**
 * The {@link SmbClient} class is a crawler client implementation for accessing files and directories
 * on SMB (Server Message Block) shares using the SMB1 protocol. It extends {@link AbstractCrawlerClient} and utilizes the JCIFS library
 * to interact with SMB resources.
 *
 * <p>
 * This client supports authentication, content retrieval, and metadata extraction from SMB files.

import jcifs.internal.smb2.io.Smb2WriteRequest;
import jcifs.internal.util.SMBUtil;
import jcifs.util.Hexdump;
import jcifs.util.transport.Response;

/**
 * SMB2 Negotiate Protocol response message.
 *
 * This response contains the server's protocol capabilities,
 * security mode, and negotiated dialect version.
 *
 * @author mbechler
 */

        DcerpcBinding.addInterface("wkssvc", "6BFFD098-A112-3610-9833-46C3F87E345A:1.0");
    }

    @Test
    void testConstructorAndGetters() {
        assertEquals(PROTO, dcerpcBinding.getProto(), "Protocol should match the constructor argument.");
        assertEquals(SERVER, dcerpcBinding.getServer(), "Server should match the constructor argument.");
        assertNull(dcerpcBinding.getOptions(), "Options should be null initially.");

import jcifs.smb1.util.transport.Response;
import jcifs.smb1.util.transport.Transport;
import jcifs.smb1.util.transport.TransportException;

/**
 * Legacy SMB transport implementation for SMB1 protocol communication.
 * Handles the low-level transport layer for SMB1 protocol messages.
 */
public class SmbTransport extends Transport implements SmbConstants {

    static final byte[] BUF = new byte[0xFFFF];

                .thenAnswer(inv -> inv.getArgument(1));

        int n = handle.sendrecv(new byte[10], 0, 0, new byte[20], 100);
        assertEquals(0, n, "Default response length is 0 unless protocol fills it");
    }

    @Test
    @DisplayName("sendrecv uses CallNamedPipe when PIPE_TYPE_CALL is set")
    void sendrecv_call_branch() throws Exception {

          "testing-jvm"
        ],
        "parallelizationMethod": {
          "name": "TestDistribution"
        }
      },
      {
        "subprojects": [
          "concurrent",
          "daemon-protocol",
          "daemon-server-worker",
          "functional",
          "internal-instrumentation-api",
          "java-api-extractor",
          "java-compiler-plugin",
          "javadoc",

    * Die Informationen über die angeforderte **spezifische Domain** befinden sich in den **HTTP-Daten**.
* Die **HTTPS-Zertifikate** „zertifizieren“ eine **bestimmte Domain**, aber das Protokoll und die Verschlüsselung erfolgen auf TCP-Ebene, **ohne zu wissen**, um welche Domain es sich handelt.
* **Standardmäßig** bedeutet das, dass Sie nur **ein HTTPS-Zertifikat pro IP-Adresse** haben können.