constructor (url, {
    interceptors,
    maxHeaderSize,
    headersTimeout,
    socketTimeout,
    requestTimeout,
    connectTimeout,
    bodyTimeout,
    idleTimeout,
    keepAlive,
    keepAliveTimeout,
    maxKeepAliveTimeout,
    keepAliveMaxTimeout,
    keepAliveTimeoutThreshold,
    socketPath,
    pipelining,
    tls,
    strictContentLength,
    maxCachedSessions,
    maxRedirections,
    connect,
    maxRequestsPerClient,
    localAddress,
    maxResponseSize,
    autoSelectFamily,
    autoSelectFamilyAttemptTimeout,
    // h2
    allowH2,
    maxConcurrentStreams
  } = {}) {
    super()

    if (keepAlive !== undefined) {
      throw new InvalidArgumentError('unsupported keepAlive, use pipelining=0 instead')
    }

    if (socketTimeout !== undefined) {
      throw new InvalidArgumentError('unsupported socketTimeout, use headersTimeout & bodyTimeout instead')
    }

    if (requestTimeout !== undefined) {
      throw new InvalidArgumentError('unsupported requestTimeout, use headersTimeout & bodyTimeout instead')
    }

    if (idleTimeout !== undefined) {
      throw new InvalidArgumentError('unsupported idleTimeout, use keepAliveTimeout instead')
    }

    if (maxKeepAliveTimeout !== undefined) {
      throw new InvalidArgumentError('unsupported maxKeepAliveTimeout, use keepAliveMaxTimeout instead')
    }

    if (maxHeaderSize != null && !Number.isFinite(maxHeaderSize)) {
      throw new InvalidArgumentError('invalid maxHeaderSize')
    }

    if (socketPath != null && typeof socketPath !== 'string') {
      throw new InvalidArgumentError('invalid socketPath')
    }

    if (connectTimeout != null && (!Number.isFinite(connectTimeout) || connectTimeout < 0)) {
      throw new InvalidArgumentError('invalid connectTimeout')
    }

    if (keepAliveTimeout != null && (!Number.isFinite(keepAliveTimeout) || keepAliveTimeout <= 0)) {
      throw new InvalidArgumentError('invalid keepAliveTimeout')
    }

    if (keepAliveMaxTimeout != null && (!Number.isFinite(keepAliveMaxTimeout) || keepAliveMaxTimeout <= 0)) {
      throw new InvalidArgumentError('invalid keepAliveMaxTimeout')
    }

    if (keepAliveTimeoutThreshold != null && !Number.isFinite(keepAliveTimeoutThreshold)) {
      throw new InvalidArgumentError('invalid keepAliveTimeoutThreshold')
    }

    if (headersTimeout != null && (!Number.isInteger(headersTimeout) || headersTimeout < 0)) {
      throw new InvalidArgumentError('headersTimeout must be a positive integer or zero')
    }

    if (bodyTimeout != null && (!Number.isInteger(bodyTimeout) || bodyTimeout < 0)) {
      throw new InvalidArgumentError('bodyTimeout must be a positive integer or zero')
    }

    if (connect != null && typeof connect !== 'function' && typeof connect !== 'object') {
      throw new InvalidArgumentError('connect must be a function or an object')
    }

    if (maxRedirections != null && (!Number.isInteger(maxRedirections) || maxRedirections < 0)) {
      throw new InvalidArgumentError('maxRedirections must be a positive number')
    }

    if (maxRequestsPerClient != null && (!Number.isInteger(maxRequestsPerClient) || maxRequestsPerClient < 0)) {
      throw new InvalidArgumentError('maxRequestsPerClient must be a positive number')
    }

    if (localAddress != null && (typeof localAddress !== 'string' || net.isIP(localAddress) === 0)) {
      throw new InvalidArgumentError('localAddress must be valid string IP address')
    }

    if (maxResponseSize != null && (!Number.isInteger(maxResponseSize) || maxResponseSize < -1)) {
      throw new InvalidArgumentError('maxResponseSize must be a positive number')
    }

    if (
      autoSelectFamilyAttemptTimeout != null &&
      (!Number.isInteger(autoSelectFamilyAttemptTimeout) || autoSelectFamilyAttemptTimeout < -1)
    ) {
      throw new InvalidArgumentError('autoSelectFamilyAttemptTimeout must be a positive number')
    }

    // h2
    if (allowH2 != null && typeof allowH2 !== 'boolean') {
      throw new InvalidArgumentError('allowH2 must be a valid boolean value')
    }

    if (maxConcurrentStreams != null && (typeof maxConcurrentStreams !== 'number' || maxConcurrentStreams < 1)) {
      throw new InvalidArgumentError('maxConcurrentStreams must be a possitive integer, greater than 0')
    }

    if (typeof connect !== 'function') {
      connect = buildConnector({
        ...tls,
        maxCachedSessions,
        allowH2,
        socketPath,
        timeout: connectTimeout,
        ...(util.nodeHasAutoSelectFamily && autoSelectFamily ? { autoSelectFamily, autoSelectFamilyAttemptTimeout } : undefined),
        ...connect
      })
    }

    this[kInterceptors] = interceptors && interceptors.Client && Array.isArray(interceptors.Client)
      ? interceptors.Client
      : [createRedirectInterceptor({ maxRedirections })]
    this[kUrl] = util.parseOrigin(url)
    this[kConnector] = connect
    this[kSocket] = null
    this[kPipelining] = pipelining != null ? pipelining : 1
    this[kMaxHeadersSize] = maxHeaderSize || http.maxHeaderSize
    this[kKeepAliveDefaultTimeout] = keepAliveTimeout == null ? 4e3 : keepAliveTimeout
    this[kKeepAliveMaxTimeout] = keepAliveMaxTimeout == null ? 600e3 : keepAliveMaxTimeout
    this[kKeepAliveTimeoutThreshold] = keepAliveTimeoutThreshold == null ? 1e3 : keepAliveTimeoutThreshold
    this[kKeepAliveTimeoutValue] = this[kKeepAliveDefaultTimeout]
    this[kServerName] = null
    this[kLocalAddress] = localAddress != null ? localAddress : null
    this[kResuming] = 0 // 0, idle, 1, scheduled, 2 resuming
    this[kNeedDrain] = 0 // 0, idle, 1, scheduled, 2 resuming
    this[kHostHeader] = `host: ${this[kUrl].hostname}${this[kUrl].port ? `:${this[kUrl].port}` : ''}\r\n`
    this[kBodyTimeout] = bodyTimeout != null ? bodyTimeout : 300e3
    this[kHeadersTimeout] = headersTimeout != null ? headersTimeout : 300e3
    this[kStrictContentLength] = strictContentLength == null ? true : strictContentLength
    this[kMaxRedirections] = maxRedirections
    this[kMaxRequests] = maxRequestsPerClient
    this[kClosedResolve] = null
    this[kMaxResponseSize] = maxResponseSize > -1 ? maxResponseSize : -1
    this[kHTTPConnVersion] = 'h1'

    // HTTP/2
    this[kHTTP2Session] = null
    this[kHTTP2SessionState] = !allowH2
      ? null
      : {
        // streams: null, // Fixed queue of streams - For future support of `push`
          openStreams: 0, // Keep track of them to decide wether or not unref the session
          maxConcurrentStreams: maxConcurrentStreams != null ? maxConcurrentStreams : 100 // Max peerConcurrentStreams for a Node h2 server
        }
    this[kHost] = `${this[kUrl].hostname}${this[kUrl].port ? `:${this[kUrl].port}` : ''}`

    // kQueue is built up of 3 sections separated by
    // the kRunningIdx and kPendingIdx indices.
    // |   complete   |   running   |   pending   |
    //                ^ kRunningIdx ^ kPendingIdx ^ kQueue.length
    // kRunningIdx points to the first running element.
    // kPendingIdx points to the first pending element.
    // This implements a fast queue with an amortized
    // time of O(1).

    this[kQueue] = []
    this[kRunningIdx] = 0
    this[kPendingIdx] = 0
  }
@param {string|URL} url
@param {import('../types/client').Client.Options} options