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])

Download a file, print its headers, and print its response body as a string.

      reversed[i] = addr[addr.length - i - 1];
    }
    return InetAddress.getByAddress(reversed);
  }

  /**
   * Returns a new InetAddress that is one less than the passed in address. This method works for
   * both IPv4 and IPv6 addresses.
   *
   * @param address the InetAddress to decrement
   * @return a new InetAddress that is one less than the passed in address

          // Checking subtype between declared and actual type bounds
          // adds recursive isSubtypeOf() call and feels complicated.
          // There is no contract one way or another as long as isSubtypeOf() works as expected.
          combined.addAll(asList(typeParam.getBounds()));
          if (combined.size() > 1) { // Object is implicit and only useful if it's the only bound.
            combined.remove(Object.class);
          }

<img src="/img/tutorial/behind-a-proxy/image01.png">

But if we access the docs UI at the "official" URL using the proxy with port `9999`, at `/api/v1/docs`, it works correctly! 🎉

You can check it at <a href="http://127.0.0.1:9999/api/v1/docs" class="external-link" target="_blank">http://127.0.0.1:9999/api/v1/docs</a>:

<img src="/img/tutorial/behind-a-proxy/image02.png">

            fail("Should not throw exception when accessTimeout is null: " + e.getMessage());
        }
    }

    public void test_ftpInfo_toChildUrl() {
        // Test that toChildUrl method works correctly (used with childUri variable)
        FtpInfo ftpInfo = new FtpClient.FtpInfo("ftp://example.com/parent/", Constants.UTF_8);

        String childUrl1 = ftpInfo.toChildUrl("file.txt");

  }

  @Override
  public String toString() {
    return "Hashing.crc32c()";
  }

  static final class Crc32cHasher extends AbstractStreamingHasher {

    /*
     * The striding algorithm works roughly as follows: it is universally the case that
     * CRC(x ^ y) == CRC(x) ^ CRC(y).  The approach we take is to break the message as follows,
     * with each letter representing a 4-byte word: ABCDABCDABCDABCD... and to calculate

```console
// Crie um diretório "Code"
$ mkdir code
// Entre nesse diretório
$ cd code
```

...e um exemplo de código Python...

```Python
wont_work()  # Isto não vai funcionar 😱
works(foo="bar")  # Isto funciona 🎉
```

...e é isso.

////

//// tab | Informações

O código em blocos de código não deve ser modificado, com exceção dos comentários.

	// DNS. Following code ensures that we treat if one of the endpoint
	// says its local for a given host - it is true for all endpoints
	// for the same host. Following code ensures that this assumption
	// is true and it works in all scenarios and it is safe to assume
	// for a given host.
	endpointLocalMap := make(map[string]bool)
	for _, ep := range endpoints {
		if ep.IsLocal {
			endpointLocalMap[ep.Host] = ep.IsLocal
		}
	}

```

The `name` parameter is **still required** (not *optional*) because it doesn't have a default value. Still, `name` accepts `None` as the value:

```Python
say_hi(name=None)  # This works, None is valid 🎉
```

The good news is, once you are on Python 3.10 you won't have to worry about that, as you will be able to simply use `|` to define unions of types:

        .isEqualTo(new File("/c:/Documents ~ Settings, or not/11-12 12:05"));
  }

  // https://github.com/google/guava/issues/2152
  @AndroidIncompatible // works in newer Android versions but fails at the version we test with
  public void testToFile_androidIncompatible() throws Exception {
    assertThat(ClassPath.toFile(new URL("file:///c:\\Documents ~ Settings, or not\\11-12 12:05")))