opcode: Int,
    payload: ByteString,
  ) {
    if (writerClosed) throw IOException("closed")

    val length = payload.size
    require(length <= PAYLOAD_BYTE_MAX) {
      "Payload size must be less than or equal to $PAYLOAD_BYTE_MAX"
    }

    val b0 = B0_FLAG_FIN or opcode
    sinkBuffer.writeByte(b0)

    var b1 = length
    if (isClient) {
      b1 = b1 or B1_FLAG_MASK

   *
   * @param code Status code as defined by
   *     [Section 7.4 of RFC 6455](http://tools.ietf.org/html/rfc6455#section-7.4).
   * @param reason Reason for shutting down, no longer than 123 bytes of UTF-8 encoded data (**not** characters) or null.
   * @throws IllegalArgumentException if [code] is invalid or [reason] is too long.
   */
  fun close(
    code: Int,
    reason: String?,
  ): Boolean

    // "intermediate_ca" as the good CA. This signs a rogue certificate for localhost. The server
    // serves the good CAs certificate in the chain, which means the certificate pinner sees a
    // different set of certificates than the SSL verifier.
    val compromisedIntermediateCa =
      HeldCertificate.Builder()
        .signedBy(compromisedRootCa)
        .certificateAuthority(0)
        .serialNumber(4L)

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

The `string()` method on response body is convenient and efficient for small documents. But if the response body is large (greater than 1 MiB), avoid `string()` because it will load the entire document into memory. In that case, prefer to process the body as a stream.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

    /**
     * A backwards-compatible fallback configuration that works on obsolete client platforms and can
     * connect to obsolete servers. When possible, prefer to upgrade your client platform or server
     * rather than using this configuration.
     */
    @JvmField
    val COMPATIBLE_TLS =
      Builder(true)
        .cipherSuites(*APPROVED_CIPHER_SUITES.toTypedArray())

108E0..108F2  ; valid                                  # 8.0  HATRAN LETTER ALEPH..HATRAN LETTER QOPH
108F3         ; disallowed                             # NA   <reserved-108F3>
108F4..108F5  ; valid                                  # 8.0  HATRAN LETTER SHIN..HATRAN LETTER TAW
108F6..108FA  ; disallowed                             # NA   <reserved-108F6>..<reserved-108FA>

*.beget.app

// BetaInABox
// Submitted by Adrian <******@****.***>
betainabox.com

// BinaryLane : http://www.binarylane.com
// Submitted by Nathan O'Sullivan <nathan@mammoth.com.au>
bnr.la

// Bitbucket : http://bitbucket.org
// Submitted by Andy Ortlieb <******@****.***>
bitbucket.io

// Blackbaud, Inc. : https://www.blackbaud.com

    val framesThatFillWindow =
      roundUp(Settings.DEFAULT_INITIAL_WINDOW_SIZE, peer.maxOutboundDataLength())

    // Write the mocking script. This accepts more data frames than necessary!
    peer.sendFrame().settings(Settings())
    peer.acceptFrame() // SETTINGS ACK
    peer.acceptFrame() // SYN_STREAM on stream 1
    for (i in 0 until framesThatFillWindow) {

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