call: Call,
          response: Response,
        ) {
          val bytes = response.body.byteStream()
          assertThat(bytes.read()).isEqualTo('a'.code)
          assertThat(bytes.read()).isEqualTo('b'.code)
          assertThat(bytes.read()).isEqualTo('c'.code)

          // This request will share a connection with 'A' cause it's all done.

    custom `ConnectionSpec`.

 *  **Beta WebSockets support.**. The `okhttp-ws` subproject offers a new
    websockets client. Please try it out! When it's ready we intend to include
    it with the core OkHttp library.

 *  **Okio updated to 1.3.0.**

    ```xml
    <dependency>
      <groupId>com.squareup.okio</groupId>
      <artifactId>okio</artifactId>

Framing rules make it impractical to implement http/2 correctly on a single blocking thread. The flow-control features introduce feedback between reads and writes, requiring writes to acknowledge reads and reads to throttle writes.

In OkHttp we expose a blocking API over a framed protocol. This document explains the code and policy that makes that work.

### Threads

#### Application's calling thread

    val source = relay.newSource()
    val sourceBuffer = Buffer()
    assertThat(source!!.read(sourceBuffer, 5)).isEqualTo(5)
    assertThat(sourceBuffer.readUtf8()).isEqualTo("abcde")
    assertThat(source.read(sourceBuffer, 1024)).isEqualTo(8)
    assertThat(sourceBuffer.readUtf8()).isEqualTo("fghijklm")
    assertThat(source.read(sourceBuffer, 1024)).isEqualTo(-1)
    assertThat(sourceBuffer.size).isEqualTo(0)
    source.close()

 */
class HeadersReader(val source: BufferedSource) {
  private var headerLimit = HEADER_LIMIT.toLong()

  /** Read a single line counted against the header size limit. */
  fun readLine(): String {
    val line = source.readUtf8LineStrict(headerLimit)
    headerLimit -= line.length.toLong()
    return line
  }

  /** Reads headers or trailers. */
  fun readHeaders(): Headers {
    val result = Headers.Builder()
    while (true) {

  var peek: String? = null

  while (true) {
    // Read a scheme name for this challenge if we don't have one already.
    if (peek == null) {
      skipCommasAndWhitespace()
      peek = readToken()
      if (peek == null) return
    }

    val schemeName = peek

    // Read a token68, a sequence of parameters, or nothing.
    val commaPrefixed = skipCommasAndWhitespace()

    result = 31 * result + defaultValue.hashCode()
    result = 31 * result + (if (typeHint) 1 else 0)
    return result
  }

  override fun toString(): String = "$name [$tagClass/$tag]"

  /** Reads and writes values without knowledge of the enclosing tag, length, or defaults. */
  interface Codec<T> {
    fun decode(reader: DerReader): T

    fun encode(
      writer: DerWriter,
      value: T,
    )

    private val message: String
    private val responseHeaders: Headers
    private val handshake: Handshake?
    private val sentRequestMillis: Long
    private val receivedResponseMillis: Long

    /**
     * Reads an entry from an input stream. A typical entry looks like this:
     *
     * ```
     * http://google.com/foo
     * GET
     * 2
     * Accept-Language: fr-CA
     * Accept-Charset: UTF-8

      @Throws(IOException::class)
      override fun read(
        sink: Buffer,
        byteCount: Long,
      ): Long {
        val buffer = Buffer()
        val read = delegate.read(buffer, byteCount)
        if (read != -1L) {
          sink.write(buffer.readByteString().toAsciiUppercase())
        }
        return read
      }
    }
  }

            request: UrlRequest,
            info: UrlResponseInfo,
          ) {
            println("onResponseStarted ${info.headers.asMap} ${info.negotiatedProtocol}")
            request.read(ByteBuffer.allocateDirect(4096 * 8))
          }

          override fun onReadCompleted(
            request: UrlRequest,
            info: UrlResponseInfo,
            byteBuffer: ByteBuffer,
          ) {