keeping the package name the same: `okhttp3`!

There are three kinds of compatibility we’re tracking:

 * **Binary compatibility** is the ability to compile a program against OkHttp 3.x, and then to run
   it against OkHttp 4.x. We’re using the excellent [japicmp][japicmp] library via its
   [Gradle plugin][japicmp_gradle] to enforce binary compatibility.

 * **Java source compatibility** is the ability to upgrade Java uses of OkHttp 3.x to 4.x without

import java.io.EOFException
import okio.Buffer

/**
 * Returns true if the body in question probably contains human readable text. Uses a small
 * sample of code points to detect unicode control characters commonly used in binary file
 * signatures.
 */
fun Buffer.isProbablyUtf8(): Boolean {
  try {
    val prefix = Buffer()
    val byteCount = size.coerceAtMost(64)
    copyTo(prefix, 0, byteCount)
    for (i in 0 until 16) {

   * closed, or canceled.
   *
   * This method returns immediately.
   */
  fun send(text: String): Boolean

  /**
   * Attempts to enqueue `bytes` to be sent as a the data of a binary (type `0x2`) message.
   *
   * This method returns true if the message was enqueued. Messages that would overflow the outgoing
   * message buffer (16 MiB) will be rejected and trigger a [graceful shutdown][close] of this web

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