TUN-1350: Enhance error messages with cloudflarestatus.com link, if relevant

tunneldns/https_proxy.go

@@ -1,10 +1,11 @@
 package tunneldns
 
 import (
+	"context"
+
 	"github.com/coredns/coredns/plugin"
 	"github.com/miekg/dns"
 	"github.com/pkg/errors"
-	"golang.org/x/net/context"
 )
 
 // Upstream is a simplified interface for proxy destination

tunneldns/https_upstream.go

@@ -2,6 +2,7 @@ package tunneldns
 
 import (
 	"bytes"
+	"context"
 	"crypto/tls"
 	"fmt"
 	"io/ioutil"
@@ -12,7 +13,6 @@ import (
 	"github.com/miekg/dns"
 	"github.com/pkg/errors"
 	log "github.com/sirupsen/logrus"
-	"golang.org/x/net/context"
 	"golang.org/x/net/http2"
 )
 

tunneldns/metrics.go

@@ -1,6 +1,8 @@
 package tunneldns
 
 import (
+	"context"
+
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/metrics/vars"
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
@@ -8,7 +10,6 @@ import (
 	"github.com/coredns/coredns/request"
 	"github.com/miekg/dns"
 	"github.com/prometheus/client_golang/prometheus"
-	"golang.org/x/net/context"
 )
 
 // MetricsPlugin is an adapter for CoreDNS and built-in metrics