coalescedRange = coalesce(coalescedRange, value, lowerEntry);

    Entry<Cut<K>, RangeMapEntry<K, V>> higherEntry =
        entriesByLowerBound.floorEntry(range.upperBound);
    coalescedRange = coalesce(coalescedRange, value, higherEntry);

    return coalescedRange;
  }

  /** Returns the range that spans the given range and entry, if the entry can be coalesced. */

   * - 2 requests happen concurrently to a host that can be coalesced onto a single connection.
   * - Both request discover no existing connection. They both make a connection.
   * - The first request "wins the race".
   * - The second request discovers it "lost the race" and closes the connection it just opened.
   * - The second request uses the coalesced connection from request1.

    user.updateRouteDatabaseAfterSuccess(route)

    val connection = this.connection!!
    user.connectionConnectEnd(connection, route)

    // If we raced another call connecting to this host, coalesce the connections. This makes for
    // 3 different lookups in the connection pool!
    val pooled3 = routePlanner.planReusePooledConnection(this, routes)
    if (pooled3 != null) return pooled3.connection

  }

  /**
   * Returns true if this connection's route has the same address as any of [candidates]. This
   * requires us to have a DNS address for both hosts, which only happens after route planning. We
   * can't coalesce connections that use a proxy, since proxies don't tell us the origin server's IP
   * address.
   */
  private fun routeMatchesAny(candidates: List<Route>): Boolean =
    candidates.any {

          return userResponse.request
        }

        return null
      }

      HTTP_MISDIRECTED_REQUEST -> {
        // OkHttp can coalesce HTTP/2 connections even if the domain names are different. See
        // RealConnection.isEligible(). If we attempted this and the server returned HTTP 421, then
        // we can retry on a different connection.

    if (entryBelowLb != null) {
      // { <
      Range<C> rangeBelowLb = entryBelowLb.getValue();
      if (rangeBelowLb.upperBound.compareTo(lbToAdd) >= 0) {
        // { < }, and we will need to coalesce
        if (rangeBelowLb.upperBound.compareTo(ubToAdd) >= 0) {
          // { < > }
          ubToAdd = rangeBelowLb.upperBound;
          /*

   * unhealthy connections in its search, this will clean them up.
   *
   * If [routes] is non-null these are the resolved routes (ie. IP addresses) for the connection.
   * This is used to coalesce related domains to the same HTTP/2 connection, such as `square.com`
   * and `square.ca`.
   */
  fun callAcquirePooledConnection(
    doExtensiveHealthChecks: Boolean,
    address: Address,

    TreeRangeMap<Integer, Integer> nonEmpty = TreeRangeMap.create();
    nonEmpty.put(Range.all(), 1);
    TreeRangeMap<Integer, Integer> coalesced = TreeRangeMap.create();
    coalesced.put(Range.atLeast(1), 1);
    coalesced.putCoalescing(Range.atMost(1), 1);
    TreeRangeMap<Integer, Integer> differentValues = TreeRangeMap.create();
    differentValues.put(Range.closedOpen(1, 2), 2);

        routes = routes,
        requireMultiplexed = planToReplace != null && planToReplace.isReady,
      ) ?: return null

    // If we coalesced our connection, remember the replaced connection's route. That way if the
    // coalesced connection later fails we don't waste a valid route.
    if (planToReplace != null) {
      nextRouteToTry = planToReplace.route
      planToReplace.closeQuietly()
    }

pkg net/http/httptrace, type DNSDoneInfo struct
pkg net/http/httptrace, type DNSDoneInfo struct, Addrs []net.IPAddr
pkg net/http/httptrace, type DNSDoneInfo struct, Coalesced bool
pkg net/http/httptrace, type DNSDoneInfo struct, Err error
pkg net/http/httptrace, type DNSStartInfo struct
pkg net/http/httptrace, type DNSStartInfo struct, Host string
pkg net/http/httptrace, type GotConnInfo struct