fix: network failure err check should ignore context canceled errors (#10567)

context canceled errors bubbling up from the network
layer has the potential to be misconstrued as network
errors, taking prematurely a server offline and triggering
a health check routine avoid this potential occurrence.

cmd/rest/client.go

@@ -112,7 +112,7 @@ func (c *Client) Call(ctx context.Context, method string, values url.Values, bod
 	}
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
-		if xnet.IsNetworkOrHostDown(err) || errors.Is(err, context.DeadlineExceeded) {
+		if xnet.IsNetworkOrHostDown(err) {
 			c.MarkOffline()
 		}
 		return nil, &NetworkError{err}
@@ -141,6 +141,9 @@ func (c *Client) Call(ctx context.Context, method string, values url.Values, bod
 		// Limit the ReadAll(), just in case, because of a bug, the server responds with large data.
 		b, err := ioutil.ReadAll(io.LimitReader(resp.Body, c.MaxErrResponseSize))
 		if err != nil {
+			if xnet.IsNetworkOrHostDown(err) {
+				c.MarkOffline()
+			}
 			return nil, err
 		}
 		if len(b) > 0 {

pkg/net/url.go

@@ -17,6 +17,7 @@
 package net
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -144,6 +145,9 @@ func IsNetworkOrHostDown(err error) bool {
 	if err == nil {
 		return false
 	}
+	if errors.Is(err, context.Canceled) {
+		return false
+	}
 	// We need to figure if the error either a timeout
 	// or a non-temporary error.
 	e, ok := err.(net.Error)