+ retryable := false
+ switch method {
+ case "GET", "HEAD", "PUT", "OPTIONS", "DELETE":
+ retryable = true
+ }
+
+ // Non-retryable methods such as POST are not safe to retry automatically,
+ // so we minimize such failures by always using a new or recently active socket
+ if !retryable {
+ if time.Since(c.lastClosedIdlesAt) > MaxIdleConnectionDuration {
+ c.lastClosedIdlesAt = time.Now()
+ c.Client.Transport.(*http.Transport).CloseIdleConnections()
+ }
+ }
+