### Return a Response Directly

The most common case would be [returning a Response directly as explained later in the advanced docs](../advanced/response-directly.md){.internal-link target=_blank}.

```Python hl_lines="8  10-11"
{!> ../../docs_src/response_model/tutorial003_02.py!}
```

 * library. For more information on Sources and Sinks as well as other features of this package, see
 * <a href="https://github.com/google/guava/wiki/IOExplained">I/O Explained</a> on the Guava wiki.
 *
 * @author Chris Nokleberg
 */
@CheckReturnValue
@ParametersAreNonnullByDefault
package com.google.common.io;

import com.google.errorprone.annotations.CheckReturnValue;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicBoolean;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Utilities necessary for working with libraries that supply plain {@link Future} instances. Note
 * that, whenever possible, it is strongly preferred to modify those libraries to return {@code
 * ListenableFuture} directly.
 *

    assertFailsWith<IllegalArgumentException> {
      Request.Builder().method("GET", "abc".toRequestBody("text/plain".toMediaType()))
    }
  }

  @Test
  fun head() {
    server.enqueue(
      MockResponse(
        headers = headersOf("Content-Type", "text/plain"),
      ),
    )
    val request =
      Request.Builder()
        .url(server.url("/"))
        .head()

       *
       * Example:
       * ```
       * --> POST /greeting http/1.1
       * Host: example.com
       * Content-Type: plain/text
       * Content-Length: 3
       * --> END POST
       *
       * <-- 200 OK (22ms)
       * Content-Type: plain/text
       * Content-Length: 6
       * <-- END HTTP
       * ```
       */
      HEADERS,

      /**

      .assertNoMoreLogs()
  }

  private fun request(): Request.Builder {
    return Request.Builder().url(url)
  }

  companion object {
    private val PLAIN = "text/plain".toMediaType()
  }

  /**
   * Returns the high-level media type, such as "text", "image", "audio", "video", or "application".
   */
  @get:JvmName("type") val type: String,
  /**
   * Returns a specific media subtype, such as "plain" or "png", "mpeg", "mp4" or "xml".
   */
  @get:JvmName("subtype") val subtype: String,
  /** Alternating parameter names with their values, like `["charset", "utf-8"]`. */
  internal val parameterNamesAndValues: Array<String>,

      client.newRequest(server.url("/").toUri())
        .header("Accept", "text/plain")
    val response = request.send()
    assertThat(response.status).isEqualTo(200)
    assertThat(response.contentAsString).isEqualTo("hello, Jetty HTTP Client")

    val recorded = server.takeRequest()
    assertThat(recorded.headers["Accept"]).isEqualTo("text/plain")
    assertThat(recorded.headers["Accept-Encoding"]).isEqualTo("gzip")

                    }
                } else if( DISABLE_PLAIN_TEXT_PASSWORDS ) {
                    throw new RuntimeException( "Plain text passwords are disabled" );
                } else if( useUnicode ) {
                    // plain text
                    String password = auth.getPassword();
                    lmHash = new byte[0];
                    ntHash = new byte[(password.length() + 1) * 2];

@GwtCompatible
@ElementTypesAreNonnullByDefault
final class NullnessCasts {
  /**
   * Accepts a {@code @Nullable T} and returns a plain {@code T}, without performing any check that
   * that conversion is safe.
   *
   * <p>This method is intended to help with usages of type parameters that have {@linkplain