Log canceled challenge lookups at DEBUG

config.go

@@ -1207,7 +1207,7 @@ func (cfg *Config) getACMEChallengeInfo(ctx context.Context, identifier string,
 		if errors.Is(err, fs.ErrNotExist) {
 			continue
 		}
-		return Challenge{}, false, fmt.Errorf("opening distributed challenge token file %s: %v", tokenKey, err)
+		return Challenge{}, false, fmt.Errorf("opening distributed challenge token file %s: %w", tokenKey, err)
 	}
 	if !challengeFound {
 		return Challenge{}, false, fmt.Errorf("%w: no information found to solve challenge for identifier: %s", errNoACMEChallengeInfo, identifier)

httphandlers.go

@@ -15,6 +15,7 @@
 package certmagic
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"net/http"
@@ -116,7 +117,10 @@ func (am *ACMEIssuer) distributedHTTPChallengeSolver(w http.ResponseWriter, r *h
 
 		// couldn't get challenge info even with distributed solver
 		log := am.Logger.Warn
-		if errors.Is(err, errNoACMEChallengeInfo) {
+		switch {
+		case errors.Is(err, errNoACMEChallengeInfo):
+			log = am.Logger.Debug
+		case errors.Is(err, context.Canceled) && errors.Is(r.Context().Err(), context.Canceled):
 			log = am.Logger.Debug
 		}
 		log("looking up info for HTTP challenge",

httphandlers_test.go

@@ -78,9 +78,10 @@ func TestHTTPChallengeHandlerNoOp(t *testing.T) {
 
 func TestHTTPChallengeLookupLogLevel(t *testing.T) {
 	tests := []struct {
-		name      string
-		storage   Storage
-		wantLevel zapcore.Level
+		name          string
+		storage       Storage
+		cancelRequest bool
+		wantLevel     zapcore.Level
 	}{
 		{
 			name:      "no active challenge",
@@ -95,6 +96,23 @@ func TestHTTPChallengeLookupLogLevel(t *testing.T) {
 			},
 			wantLevel: zap.WarnLevel,
 		},
+		{
+			name: "request canceled",
+			storage: loadResultStorage{
+				Storage: &memoryStorage{},
+				err:     context.Canceled,
+			},
+			cancelRequest: true,
+			wantLevel:     zap.DebugLevel,
+		},
+		{
+			name: "storage operation canceled",
+			storage: loadResultStorage{
+				Storage: &memoryStorage{},
+				err:     context.Canceled,
+			},
+			wantLevel: zap.WarnLevel,
+		},
 		{
 			name: "storage failure",
 			storage: loadResultStorage{
@@ -123,6 +141,11 @@ func TestHTTPChallengeLookupLogLevel(t *testing.T) {
 				"http://example.com/.well-known/acme-challenge/token",
 				nil,
 			)
+			if tt.cancelRequest {
+				ctx, cancel := context.WithCancel(req.Context())
+				cancel()
+				req = req.WithContext(ctx)
+			}
 			if am.HandleHTTPChallenge(httptest.NewRecorder(), req) {
 				t.Fatal("expected challenge request not to be handled")
 			}