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

///

## Recap { #recap }

    <!-- Protocol types may only define constants in interfaces -->
    <suppress checks="InterfaceIsTypeCheck"
              files=".*[/\\]tooling-api[/\\]src[/\\]main[/\\]java[/\\]org[/\\]gradle[/\\]tooling[/\\]internal[/\\]protocol.+"/>
    <suppress checks="InterfaceIsTypeCheck"

import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;

/**
 * Handler for the "gcs" protocol, allowing access to objects stored in Google Cloud Storage.
 * This handler extends {@link URLStreamHandler} to provide a way to open connections to GCS objects
 * using URLs with the "gcs" protocol.
 *
 * <p>
 * The URL format is expected to be: {@code gcs://bucketName/objectName}.

import software.amazon.awssdk.services.s3.model.S3Exception;

/**
 * Handler for the "s3" protocol, allowing access to objects stored in S3-compatible storage services.
 * This handler extends {@link URLStreamHandler} to provide a way to open connections to S3 objects
 * using URLs with the "s3" protocol.
 *
 * <p>
 * The URL format is expected to be: {@code s3://bucketName/objectName}.

### Key Features

- **Multi-Protocol Support**: HTTP/HTTPS, File System, FTP, SMB/CIFS, Cloud Storage (MinIO, S3)

    if (networkRequest == null && cacheResponse == null) {
      return Response
        .Builder()
        .request(chain.request())
        .protocol(Protocol.HTTP_1_1)
        .code(HTTP_GATEWAY_TIMEOUT)
        .message("Unsatisfiable Request (only-if-cached)")
        .sentRequestAtMillis(-1L)
        .receivedResponseAtMillis(System.currentTimeMillis())
        .build()

                    final String protocol = url.getProtocol();
                    int port = url.getPort();
                    if (port == -1) {
                        port = "https".equalsIgnoreCase(protocol) ? 443 : 80;
                    }
                    final PasswordAuthentication auth = Authenticator.requestPasswordAuthentication(null, port, protocol, "", authMethod);
                    if (auth == null) {

     */
    SmbSession getSmbSession(CIFSContext tf, String targetHost, String targetDomain);

    /**
     * Checks if this transport uses the SMB2 protocol.
     *
     * @return whether this is a SMB2 connection
     * @throws SmbException if an error occurs checking protocol version
     */
    boolean isSMB2() throws SmbException;

    /**
     * Gets the number of currently pending requests.
     *

package jcifs.smb1.smb1;

/**
 * Represents a file or directory entry in SMB1 protocol.
 */
public interface FileEntry {

    /**
     * Gets the name of the file or directory.
     *
     * @return the file or directory name
     */
    String getName();

    /**
     * Gets the type of the entry.
     *
     * @return the entry type
     */
    int getType();

    /**
     * Gets the file attributes.
     *

import io.minio.errors.ServerException;
import io.minio.errors.XmlParserException;

/**
 * Handler for the "storage" protocol, allowing access to objects stored in a MinIO-compatible storage service.
 * This handler extends {@link URLStreamHandler} to provide a way to open connections to storage objects
 * using URLs with the "storage" protocol.
 *
 * <p>
 * The URL format is expected to be: {@code storage://bucketName/objectName}.