## [Requests](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-request/)

Each HTTP request contains a URL, a method (like `GET` or `POST`), and a list of headers. Requests may also contain a body: a data stream of a specific content type.

## [Responses](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-response/)

The response answers the request with a code (like 200 for success or 404 for not found), headers, and its own optional body.

        type = type,
        mappedTo = mappedTo,
      )
  }

  return result
}

internal fun canonicalizeType(type: Int): Int {
  return when (type) {
    TYPE_IGNORED -> TYPE_IGNORED

    TYPE_MAPPED,
    TYPE_DISALLOWED_STD3_MAPPED,
    -> TYPE_MAPPED

    TYPE_DEVIATION,
    TYPE_DISALLOWED_STD3_VALID,
    TYPE_VALID,
    -> TYPE_VALID

      private var type = MIXED
      private val parts = mutableListOf<Part>()

      /**
       * Set the MIME type. Expected values for `type` are [MIXED] (the default), [ALTERNATIVE],
       * [DIGEST], [PARALLEL] and [FORM].
       */
      fun setType(type: MediaType) =
        apply {
          require(type.type == "multipart") { "multipart != $type" }
          this.type = type
        }

  }

  private fun dnsResponse(s: String): MockResponse {
    return MockResponse.Builder()
      .body(Buffer().write(s.decodeHex()))
      .addHeader("content-type", "application/dns-message")
      .addHeader("content-length", s.length / 2)
      .build()
  }

  private fun buildLocalhost(
    bootstrapClient: OkHttpClient,
    includeIPv6: Boolean,

 *  Be more aggressive about testing pooled sockets before reuse. (thanks
    warpspin)
 *  Include `Content-Type` and `Content-Encoding` in the Apache HTTP client
    adapter. (thanks kwuollett)
 *  Add a media type class to OkHttp.
 *  Change custom header prefix:

    ```
    X-Android-Sent-Millis is now OkHttp-Sent-Millis

          ) {
            cacheRequestClosed = true
            cacheRequest.abort()
          }
          source.close()
        }
      }

    val contentType = response.header("Content-Type")
    val contentLength = response.body.contentLength()
    return response.newBuilder()
      .body(RealResponseBody(contentType, contentLength, cacheWritingSource.buffer()))
      .build()
  }

   * as attempting IPv6 first, can make such decisions.
   */
  @ExperimentalOkHttpApi
  enum class DnsClass(val type: Int) {
    IPV4(TYPE_A),
    IPV6(TYPE_AAAA),
  }

  @ExperimentalOkHttpApi
  companion object {
    const val TYPE_A = 1
    const val TYPE_AAAA = 28

    /**
     * Adapt an AsyncDns implementation to Dns, waiting until onComplete is received

    val addressType = fromSource.readByte() and 0xff
    val toAddress =
      when (addressType) {
        ADDRESS_TYPE_IPV4 -> {
          InetAddress.getByAddress(fromSource.readByteArray(4L))
        }

        ADDRESS_TYPE_DOMAIN_NAME -> {
          val domainNameLength: Int = fromSource.readByte() and 0xff
          val domainName = fromSource.readUtf8(domainNameLength.toLong())

   * [Byte Order Mark (BOM)](https://en.wikipedia.org/wiki/Byte_order_mark), it is consumed and
   * used to determine the charset of the response bytes.
   *
   * Otherwise if the response has a `Content-Type` header that specifies a charset, that is used
   * to determine the charset of the response bytes.
   *
   * Otherwise the response bytes are decoded as UTF-8.
   */
  fun charStream(): Reader =

        .listener(realConnection)
        .build()
    connection.start(sendConnectionPreface = false)

    // verify the peer received the ACK
    val ackFrame = peer.takeFrame()
    assertThat(ackFrame.type).isEqualTo(Http2.TYPE_SETTINGS)
    assertThat(ackFrame.streamId).isEqualTo(0)
    assertThat(ackFrame.ack).isTrue()

    taskFaker.runTasks()

    return connection
  }

  private fun updateMaxConcurrentStreams(