coders call this and we don't want their users to suffer.


## Version 4.0.0

_2019-06-26_

**This release upgrades OkHttp to Kotlin.** We tried our best to make fast and safe to upgrade
from OkHttp 3.x. We wrote an [upgrade guide][upgrading_to_okhttp_4] to help with the migration and a
[blog post][okhttp4_blog_post] to explain it.

// It uses default values for all of the other fields (as BSD and GNU tar does).
func (tw *Writer) writeRawFile(name, data string, flag byte, format Format) error {
	tw.blk.reset()

	// Best effort for the filename.
	name = toASCII(name)
	if len(name) > nameSize {
		name = name[:nameSize]
	}
	name = strings.TrimRight(name, "/")

	var f formatter
	v7 := tw.blk.toV7()

	// other fields in Header take precedence over PAXRecords.
	PAXRecords map[string]string

	// Format specifies the format of the tar header.
	//
	// This is set by Reader.Next as a best-effort guess at the format.
	// Since the Reader liberally reads some non-compliant files,
	// it is possible for this to be FormatUnknown.
	//
	// If the format is unspecified when Writer.WriteHeader is called,

    end
    subgraph azkaban-project[prisoner-of-azkaban project]
        azkaban(prisoner-of-azkaban) --> |requires| harry-3
    end
```

/// tip

It's very common in Python packages to try the best to **avoid breaking changes** in **new versions**, but it's better to be safe, and install newer versions intentionally and when you can run the tests to check everything is working correctly.

///

    inconsistent and awkward to explore.

 *  **OkHttpClient now implements the new `Call.Factory` interface.** This
    interface will make your code easier to test. When you test code that makes
    HTTP requests, you can use this interface to replace the real `OkHttpClient`
    with your own mocks or fakes.

    The interface will also let you use OkHttp's API with another HTTP client's

   * recognize certain cases where distinct {@code Converter} instances would in fact behave
   * identically. However, this is not true of {@code Converter} implementations in general. It is
   * best not to depend on it.
   */
  @Override
  public boolean equals(@Nullable Object object) {
    return super.equals(object);
  }

  // Static converters

  /**

   * building caches whose key or value types are incompatible with the types accepted by the
   * weigher already provided; the {@code CacheBuilder} type cannot do this. For best results,
   * simply use the standard method-chaining idiom, as illustrated in the documentation at top,
   * configuring a {@code CacheBuilder} and building your {@link Cache} all in a single statement.
   *

    assertThat(result.get(2)).isEqualTo("barfoo");
    assertThat(cache.getUnchecked(key)).isEqualTo("barfoo");
  }

  // Test ignored because it is extremely flaky in CI builds
  @SuppressWarnings("ThreadPriorityCheck") // doing our best to test for races
  public void
      ignoreTestExpandDuringRefresh()
      throws InterruptedException, ExecutionException {

   * speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent
   * modification. Fail-fast iterators throw {@code ConcurrentModificationException} on a
   * best-effort basis. Therefore, it would be wrong to write a program that depended on this
   * exception for its correctness: <i>the fail-fast behavior of iterators should be used only to
   * detect bugs.</i>
   *

    assertThat(result.get(2)).isEqualTo("barfoo");
    assertThat(cache.getUnchecked(key)).isEqualTo("barfoo");
  }

  // Test ignored because it is extremely flaky in CI builds
  @SuppressWarnings("ThreadPriorityCheck") // doing our best to test for races
  public void
      ignoreTestExpandDuringRefresh()
      throws InterruptedException, ExecutionException {