## Retrying Requests

Sometimes connections fail: either a pooled connection was stale and disconnected, or the webserver itself couldn’t be reached. OkHttp will retry the request with a different route if one is available.

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

	db.Mux.RLock()
	if db.Stmts != nil {
		if stmt, ok := db.Stmts.Get(query); ok && (!stmt.Transaction || isTransaction) {
			db.Mux.RUnlock()
			return stmt, stmt.Error()
		}
	}
	db.Mux.RUnlock()

	// retry
	db.Mux.Lock()
	if db.Stmts != nil {
		if stmt, ok := db.Stmts.Get(query); ok && (!stmt.Transaction || isTransaction) {
			db.Mux.Unlock()
			return stmt, stmt.Error()
		}
	}

    override val call: Call,
  ) : CallEvent()

  data class RetryDecision(
    override val timestampNs: Long,
    override val call: Call,
    val exception: IOException,
    val retry: Boolean,
  ) : CallEvent()

  data class FollowUpDecision(
    override val timestampNs: Long,
    override val call: Call,
    val networkResponse: Response,
    val nextRequest: Request?,

   *    has since been closed by the server.
   *  * A client timeout (HTTP 408).
   *  * A authorization challenge (HTTP 401 and 407) that is satisfied by the [Authenticator].
   *  * A retryable server failure (HTTP 503 with a `Retry-After: 0` response header).
   *  * A misdirected request (HTTP 421) on a coalesced connection.
   */
  open fun isOneShot(): Boolean = false

  /**
   * Returns the SHA-256 hash of this [RequestBody]
   */

	go func() {
		for {
			client.doListen(ctx, listenCh, v)
			select {
			case <-ctx.Done():
				return
			default:
				// There was error in the REST request, retry after sometime as probably the peer is down.
				time.Sleep(5 * time.Second)
			}
		}
	}()
}

// Trace - send http trace request to peer nodes

   * find an exchange to carry the request.
   *
   * Note that an exchange will not be needed if the request is satisfied by the cache.
   *
   * @param newRoutePlanner true if this is not a retry and new routing can be performed.
   */
  fun enterNetworkInterceptorExchange(
    request: Request,
    newRoutePlanner: Boolean,
    chain: RealInterceptorChain,
  ) {

 *  Fix: Don't miss whole operation timeouts when calls redirect.
 *  Fix: Don't leak connections if web sockets have malformed responses or if `onOpen()` throws.
 *  Fix: Don't retry when request bodies fail due to `FileNotFoundException`.
 *  Fix: Don't crash when URLs have IPv4-mapped IPv6 addresses.
 *  Fix: Don't crash when building `HandshakeCertificates` on Android API 28.

There may be many routes for a single address. For example, a webserver that is hosted in multiple datacenters may yield multiple IP addresses in its DNS response.

In limited situations OkHttp will retry a route if connecting fails:

			time.Sleep(sleep)
		}
		if err != nil {
			retry(err)
			continue
		}
		// Send connect message.
		m := message{
			Op: OpConnect,
		}
		req := connectReq{
			Host: c.Local,
			ID:   c.id,
			Time: time.Now(),
		}
		req.addToken(c.authFn)
		err = c.sendMsg(conn, m, &req)
		if err != nil {
			retry(err)
			continue
		}
		// Wait for response
		var r connectResp

		return Endpoints{}
	}
	return disksToHeal
}

var newDiskHealingTimeout = newDynamicTimeout(30*time.Second, 10*time.Second)

var errRetryHealing = errors.New("some items failed to heal, we will retry healing this drive again")

func healFreshDisk(ctx context.Context, z *erasureServerPools, endpoint Endpoint) error {
	poolIdx, setIdx := endpoint.PoolIdx, endpoint.SetIdx
	disk := getStorageViaEndpoint(endpoint)