diff --git a/internal/handler/handler_fuzz_test.go b/internal/handler/handler_fuzz_test.go
index ff38b11..66d225b 100644
--- a/internal/handler/handler_fuzz_test.go
+++ b/internal/handler/handler_fuzz_test.go
@@ -24,11 +24,6 @@ import (
 	"go.uber.org/zap"
 )
 
-const (
-	fuzzSuccessExitCode = 0
-	fuzzFailExitCode    = -1
-)
-
 func prepareStrings(tp *go_fuzz_utils.TypeProvider, count int) ([]string, error) {
 	array := make([]string, count)
 	var err error
@@ -222,23 +217,18 @@ func InitFuzzUpload() {
 
 }
 
-func DoFuzzUpload(input []byte) int {
+func DoFuzzUpload(input []byte) {
 	// FUZZER INIT
 	if len(input) < 100 {
-		return fuzzFailExitCode
+		return
 	}
 
 	tp, err := go_fuzz_utils.NewTypeProvider(input)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
-	_, _, _, _, _, _, _, err = upload(tp)
-	if err != nil {
-		return fuzzFailExitCode
-	}
-
-	return fuzzSuccessExitCode
+	_, _, _, _, _, _, _, _ = upload(tp)
 }
 
 func FuzzUpload(f *testing.F) {
@@ -307,30 +297,28 @@ func InitFuzzGet() {
 
 }
 
-func DoFuzzGet(input []byte) int {
+func DoFuzzGet(input []byte) {
 	// FUZZER INIT
 	if len(input) < 100 {
-		return fuzzFailExitCode
+		return
 	}
 
 	tp, err := go_fuzz_utils.NewTypeProvider(input)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	ctx, hc, cnrID, resp, filename, _, _, err := upload(tp)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	r, err := downloadOrHead(tp, ctx, hc, cnrID, resp, filename)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	hc.Handler().DownloadByAddressOrBucketName(r)
-
-	return fuzzSuccessExitCode
 }
 
 func FuzzGet(f *testing.F) {
@@ -343,30 +331,28 @@ func InitFuzzHead() {
 
 }
 
-func DoFuzzHead(input []byte) int {
+func DoFuzzHead(input []byte) {
 	// FUZZER INIT
 	if len(input) < 100 {
-		return fuzzFailExitCode
+		return
 	}
 
 	tp, err := go_fuzz_utils.NewTypeProvider(input)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	ctx, hc, cnrID, resp, filename, _, _, err := upload(tp)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	r, err := downloadOrHead(tp, ctx, hc, cnrID, resp, filename)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	hc.Handler().HeadByAddressOrBucketName(r)
-
-	return fuzzSuccessExitCode
 }
 
 func FuzzHead(f *testing.F) {
@@ -379,36 +365,36 @@ func InitFuzzDownloadByAttribute() {
 
 }
 
-func DoFuzzDownloadByAttribute(input []byte) int {
+func DoFuzzDownloadByAttribute(input []byte) {
 	// FUZZER INIT
 	if len(input) < 100 {
-		return fuzzFailExitCode
+		return
 	}
 
 	tp, err := go_fuzz_utils.NewTypeProvider(input)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	ctx, hc, cnrID, _, _, attrKey, attrVal, err := upload(tp)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	cid := cnrID.EncodeToString()
 	cid, err = maybeFillRandom(tp, cid)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	attrKey, err = maybeFillRandom(tp, attrKey)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	attrVal, err = maybeFillRandom(tp, attrVal)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	r := new(fasthttp.RequestCtx)
@@ -418,8 +404,6 @@ func DoFuzzDownloadByAttribute(input []byte) int {
 	r.SetUserValue("attr_val", attrVal)
 
 	hc.Handler().DownloadByAttribute(r)
-
-	return fuzzSuccessExitCode
 }
 
 func FuzzDownloadByAttribute(f *testing.F) {
@@ -432,36 +416,36 @@ func InitFuzzHeadByAttribute() {
 
 }
 
-func DoFuzzHeadByAttribute(input []byte) int {
+func DoFuzzHeadByAttribute(input []byte) {
 	// FUZZER INIT
 	if len(input) < 100 {
-		return fuzzFailExitCode
+		return
 	}
 
 	tp, err := go_fuzz_utils.NewTypeProvider(input)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	ctx, hc, cnrID, _, _, attrKey, attrVal, err := upload(tp)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	cid := cnrID.EncodeToString()
 	cid, err = maybeFillRandom(tp, cid)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	attrKey, err = maybeFillRandom(tp, attrKey)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	attrVal, err = maybeFillRandom(tp, attrVal)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	r := new(fasthttp.RequestCtx)
@@ -471,8 +455,6 @@ func DoFuzzHeadByAttribute(input []byte) int {
 	r.SetUserValue("attr_val", attrVal)
 
 	hc.Handler().HeadByAttribute(r)
-
-	return fuzzSuccessExitCode
 }
 
 func FuzzHeadByAttribute(f *testing.F) {
@@ -485,32 +467,32 @@ func InitFuzzDownloadZipped() {
 
 }
 
-func DoFuzzDownloadZipped(input []byte) int {
+func DoFuzzDownloadZipped(input []byte) {
 	// FUZZER INIT
 	if len(input) < 100 {
-		return fuzzFailExitCode
+		return
 	}
 
 	tp, err := go_fuzz_utils.NewTypeProvider(input)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	ctx, hc, cnrID, _, _, _, _, err := upload(tp)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	cid := cnrID.EncodeToString()
 	cid, err = maybeFillRandom(tp, cid)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	prefix := ""
 	prefix, err = maybeFillRandom(tp, prefix)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	r := new(fasthttp.RequestCtx)
@@ -519,8 +501,6 @@ func DoFuzzDownloadZipped(input []byte) int {
 	r.SetUserValue("prefix", prefix)
 
 	hc.Handler().DownloadZip(r)
-
-	return fuzzSuccessExitCode
 }
 
 func FuzzDownloadZipped(f *testing.F) {
@@ -533,21 +513,21 @@ func InitFuzzStoreBearerTokenAppCtx() {
 
 }
 
-func DoFuzzStoreBearerTokenAppCtx(input []byte) int {
+func DoFuzzStoreBearerTokenAppCtx(input []byte) {
 	// FUZZER INIT
 	if len(input) < 100 {
-		return fuzzFailExitCode
+		return
 	}
 
 	tp, err := go_fuzz_utils.NewTypeProvider(input)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	prefix := ""
 	prefix, err = maybeFillRandom(tp, prefix)
 	if err != nil {
-		return fuzzFailExitCode
+		return
 	}
 
 	ctx := context.Background()
@@ -570,8 +550,6 @@ func DoFuzzStoreBearerTokenAppCtx(input []byte) int {
 	}
 
 	tokens.StoreBearerTokenAppCtx(ctx, r)
-
-	return fuzzSuccessExitCode
 }
 
 func FuzzStoreBearerTokenAppCtx(f *testing.F) {