# `Response` class

You can declare a parameter in a *path operation function* or dependency to be of type `Response` and then you can set data for the response like headers or cookies.

You can also use it directly to create an instance of it and return it from your *path operations*.

You can import it directly from `fastapi`:

```python
from fastapi import Response
```

                }
            }
        }
    }

    /**
     * Retrieves response data for the given URI using SMB1 protocol.
     *
     * @param uri the URI to retrieve data from
     * @param includeContent whether to include content in the response
     * @return the response data
     */
    protected ResponseData getResponseData(final String uri, final boolean includeContent) {

 * payload sizes, padding rules, and error conditions such as null and empty
 * input.
 */
@ExtendWith(MockitoExtension.class)
class Base64Test {

    /**
     * Data provider for various byte arrays and the expected Base64 string.
     */
    static Stream<Arguments> encodeProvider() {
        return Stream.of(Arguments.of(new byte[0], ""), Arguments.of(new byte[] { (byte) 0x41 }, "QQ=="), // "A"

     * Creates a new SitemapsResponseProcessor instance.
     */
    public SitemapsResponseProcessor() {
        super();
    }

    /**
     * Processes the given response data, extracting URLs from sitemaps.
     * @param responseData The response data.
     */
    @Override
    public void process(final ResponseData responseData) {
        final SitemapsHelper sitemapsHelper = crawlerContainer.getComponent("sitemapsHelper");

    val data = Buffer().writeUtf8(content)
    val source: Source =
      object : Source {
        var closed = false

        override fun close() {
          closed = true
        }

        override fun read(
          sink: Buffer,
          byteCount: Long,
        ): Long {
          check(!closed)
          return data.read(sink, byteCount)
        }

Declare the **header parameters** that you need in a **Pydantic model**, and then declare the parameter as `Header`:

{* ../../docs_src/header_param_models/tutorial001_an_py310.py hl[9:14,18] *}

**FastAPI** will **extract** the data for **each field** from the **headers** in the request and give you the Pydantic model you defined.

## Check the Docs { #check-the-docs }

You can see the required headers in the docs UI at `/docs`:

constraints.Future.message = {item} deve ser uma data futura.
constraints.Max.message = {item} deve ser menor ou igual a {value}.
constraints.Min.message = {item} deve ser maior ou igual a {value}.
constraints.NotNull.message = {item} é obrigatório.
constraints.Null.message = {item} deve ser nulo.
constraints.Past.message = {item} deve ser uma data passada.
constraints.Pattern.message = {item} não corresponde a "{regexp}".

    /**
     * Session flag indicating this is a null/anonymous session
     */
    public static final int SMB2_SESSION_FLAGS_IS_NULL = 0x2;

    /**
     * Session flag indicating data encryption is required for this session
     */
    public static final int SMB2_SESSION_FLAG_ENCRYPT_DATA = 0x4;

    private int sessionFlags;
    private byte[] blob;

    /**

            return doNameQuery(new Name(host, type, scope), svr);
        }
        int IP = 0x00;
        int hitDots = 0;
        final char[] data = host.toCharArray();

        for (int i = 0; i < data.length; i++) {
            char c = data[i];
            if (c < 48 || c > 57) {
                return doNameQuery(new Name(host, type, scope), svr);
            }
            int b = 0x00;

 */
public interface ACE {

    /**
     * Permission to read data from a file or list directory contents
     */
    int FILE_READ_DATA = 0x00000001; // 1
    /**
     * Permission to write data to a file or add files to a directory
     */
    int FILE_WRITE_DATA = 0x00000002; // 2
    /**
     * Permission to append data to a file or add subdirectories
     */
    int FILE_APPEND_DATA = 0x00000004; // 3