Print error to info log before backing off (#641)

* Print error to info log before backing off

* Change LogInfo to LogError

Co-authored-by: Joel Hendrix <jhendrix@microsoft.com>

autorest/sender.go

@@ -272,6 +272,7 @@ func DoRetryForAttempts(attempts int, backoff time.Duration) SendDecorator {
 				if err == nil {
 					return resp, err
 				}
+				logger.Instance.Writef(logger.LogError, "DoRetryForAttempts: received error for attempt %d: %v\n", attempt+1, err)
 				if !DelayForBackoff(backoff, attempt, r.Context().Done()) {
 					return nil, r.Context().Err()
 				}
@@ -326,6 +327,9 @@ func doRetryForStatusCodesImpl(s Sender, r *http.Request, count429 bool, attempt
 		if err == nil && !ResponseHasStatusCode(resp, codes...) || IsTokenRefreshError(err) {
 			return resp, err
 		}
+		if err != nil {
+			logger.Instance.Writef(logger.LogError, "DoRetryForStatusCodes: received error for attempt %d: %v\n", attempt+1, err)
+		}
 		delayed := DelayWithRetryAfter(resp, r.Context().Done())
 		// if this was a 429 set the delay cap as specified.
 		// applicable only in the absence of a retry-after header.
@@ -392,6 +396,7 @@ func DoRetryForDuration(d time.Duration, backoff time.Duration) SendDecorator {
 				if err == nil {
 					return resp, err
 				}
+				logger.Instance.Writef(logger.LogError, "DoRetryForDuration: received error for attempt %d: %v\n", attempt+1, err)
 				if !DelayForBackoff(backoff, attempt, r.Context().Done()) {
 					return nil, r.Context().Err()
 				}