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`:

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

## `UploadFile` with Additional Metadata { #uploadfile-with-additional-metadata }

# NOTE: This Dockerfile is no longer in use.
# It is kept just in case, but it's recommended to use the 2022 version,
# and that is what internal CI uses as well.

# This Dockerfile creates an image that has:
# - the correct MTU setting for networking from inside the container to work.
# - Visual Studio 2022 Build Tools
# - MSVC 14.39
# - LLVM/Clang 18.1.4
# - MSYS2 + curl, git, patch, vim, unzip, zip
# - Python 3.12.3
# - Bazelisk 1.19.0

    File tempFile = createTempFile();
    PrintWriter writer = new PrintWriter(tempFile, "UTF-8");
    writer.println("rud a chur ar an méar fhada");
    writer.close();

    // First check that we can't find it without setting the context loader.
    // This is a sanity check that the test doesn't spuriously pass because
    // the resource is visible to the system class loader.

    @Test
    void testLoadBalancingStrategies() throws Exception {
        // Test different load balancing strategies
        ChannelLoadBalancer loadBalancer = new ChannelLoadBalancer(channelManager);

        // Test setting different strategies
        LoadBalancingStrategy[] strategies = { LoadBalancingStrategy.ROUND_ROBIN, LoadBalancingStrategy.LEAST_LOADED,

	// Settings specific to proxied requests.
	tr.ResponseHeaderTimeout = 30 * time.Minute

	return func() *http.Transport {
		return tr
	}
}

// NewHTTPTransportWithTimeout allows setting a timeout for response headers
func (s ConnSettings) NewHTTPTransportWithTimeout(timeout time.Duration) *http.Transport {
	tr := s.getDefaultTransport(0)

	// Settings specific to this transport.

    }
    safeChars += "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    // Avoid ambiguous parameters. Safe characters are never modified so if
    // space is a safe character then setting plusForSpace is meaningless.
    if (plusForSpace && safeChars.contains(" ")) {
      throw new IllegalArgumentException(
          "plusForSpace cannot be specified when space is a 'safe' character");
    }

    }

    @Test
    @DisplayName("Test hasMoreElements method")
    void testHasMoreElements() {
        // Test initial state
        assertTrue(response.hasMoreElements());

        // Test after setting error code (not status)
        response.setTestErrorCode(1); // Non-zero errorCode indicates error
        assertFalse(response.hasMoreElements());

        // Reset error and test hasMore flag

        return new ProjectBuilderRequestBuilder();
    }

    /**
     * Builder for creating ProjectBuilderRequest instances.
     * This builder provides a fluent API for setting the various properties of a request.
     */
    @NotThreadSafe
    class ProjectBuilderRequestBuilder {
        Session session;
        RequestTrace trace;
        Path path;
        Source source;

`--sftp=trusted-user-ca-key=...` specifies a file containing public key of certificate authority that is trusted
to sign user certificates for authentication.

Implementation is identical with "TrustedUserCAKeys" setting in OpenSSH server with exception that only one CA
key can be defined.

If a certificate is presented for authentication and has its signing CA key is in this file, then it may be

- In order to remotely attach a debugger to the process: `--debug-jvm`
- In order to set a different keystore password: `--keystore-password`
- In order to set an Elasticsearch setting, provide a setting with the following prefix: `-Dtests.es.`

=== Test case filtering.

You can run a single test, provided that you specify the Gradle project. See the documentation on