---
title: Recipes
description: A collection of common/useful code examples for Kotlin and Java
---


# Recipes

We've written some recipes that demonstrate how to solve common problems with OkHttp. Read through them to learn about how everything works together. Cut-and-paste these examples freely; that's what they're for.

### Synchronous Get ([.kt][SynchronousGetKotlin], [.java][SynchronousGetJava])

import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;
import org.junit.Ignore;

/**
 * Base class for map testers.
 *
 * <p>TODO: see how much of this is actually needed once Map testers are written. (It was cloned
 * from AbstractCollectionTester.)
 *
 * @param <K> the key type of the map to be tested.
 * @param <V> the value type of the map to be tested.
 * @author George van den Driessche
 */
@GwtCompatible

        // Create buffer for encoding
        byte[] buffer = new byte[16];
        int bytesWritten = info.encode(buffer, 0);

        // Verify bytes written
        assertEquals(8, bytesWritten);

        // Verify encoded value
        long decodedValue = SMBUtil.readInt8(buffer, 0);
        assertEquals(endOfFile, decodedValue);
    }

    @Test

 * returns the same bytes as the upstream source. Downstream sources may read data either as it
 * is returned by upstream, or after the upstream source has been exhausted.
 *
 * As bytes are returned from upstream they are written to a local file. Downstream sources read
 * from this file as necessary.
 *
 * This class also keeps a small buffer of bytes recently read from upstream. This is intended to
 * save a small amount of file I/O and data copying.

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

/*
 * MurmurHash3 was written by Austin Appleby, and is placed in the public
 * domain. The author hereby disclaims copyright to this source code.
 */

/*
 * Source:
 * http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp

        // Check that bytes before startIndex are unchanged
        for (int i = 0; i < startIndex; i++) {
            assertEquals((byte) (i & 0xFF), dst[i]);
        }

        // Check that bytes after written area are unchanged
        for (int i = startIndex + bytesWritten; i < dst.length; i++) {
            assertEquals((byte) (i & 0xFF), dst[i]);
        }
    }

    @Test

	if !strings.Contains(str, "rgs.id = user.id") {
		t.Errorf("The second join condition is over written instead of combining")
	}

	if !strings.Contains(str, "`users`.`company_id` = `companies`.`id`") && !strings.Contains(str, "\"users\".\"company_id\" = \"companies\".\"id\"") {
		t.Errorf("The first join condition is over written instead of combining")
	}
}

func TestToSQL(t *testing.T) {

        }
      }

      if (HttpMethod.invalidatesCache(networkRequest.method)) {
        try {
          cache.remove(networkRequest)
        } catch (_: IOException) {
          // The cache cannot be written.
        }
      }
    }

    return response
  }

  /**
   * Returns a new source that writes bytes to [cacheRequest] as they are read by the source

            }
            item = newItem;
        }

        /**
         * Writes a protwords item to the temporary file.
         * @param oldItem the item to write
         * @return the written item or null if deleted
         */
        public ProtwordsItem write(final ProtwordsItem oldItem) {
            try {
                if (item == null || item.getId() != oldItem.getId() || !item.isUpdated()) {

    return writer
  }

  /**
   * Shortens the last frame from its original length to `length`. This will cause the peer to
   * close the socket as soon as this frame has been written; otherwise the peer stays open until
   * explicitly closed.
   */
  fun truncateLastFrame(length: Int): Http2Writer {
    val lastFrame = outFrames.removeAt(outFrames.size - 1)