diff --git a/transport/http_util.go b/transport/http_util.go
index be4925e8..ea363d93 100644
--- a/transport/http_util.go
+++ b/transport/http_util.go
@@ -35,6 +35,7 @@ package transport
 
 import (
 	"bufio"
+	"bytes"
 	"fmt"
 	"io"
 	"net"
@@ -288,6 +289,80 @@ func timeoutDecode(s string) (time.Duration, error) {
 	return d * time.Duration(t), nil
 }
 
+const (
+	spaceByte   = ' '
+	tildaByte   = '~'
+	percentByte = '%'
+)
+
+// grpcMessageEncode is used to encode status code in header field
+// "grpc-message".
+// It checks to see if each individual byte in msg is an
+// allowable byte, and then either percent encoding or passing it through.
+// When percent encoding, the byte is converted into hexadecimal notation
+// with a '%' prepended.
+func grpcMessageEncode(msg string) string {
+	if msg == "" {
+		return ""
+	}
+	lenMsg := len(msg)
+	for i := 0; i < lenMsg; i++ {
+		c := msg[i]
+		if !(c >= spaceByte && c < tildaByte && c != percentByte) {
+			return grpcMessageEncodeUnchecked(msg)
+		}
+	}
+	return msg
+}
+
+func grpcMessageEncodeUnchecked(msg string) string {
+	var buf bytes.Buffer
+	lenMsg := len(msg)
+	for i := 0; i < lenMsg; i++ {
+		c := msg[i]
+		if c >= spaceByte && c < tildaByte && c != percentByte {
+			buf.WriteByte(c)
+		} else {
+			buf.WriteString(fmt.Sprintf("%%%02X", c))
+		}
+	}
+	return buf.String()
+}
+
+// grpcMessageDecode decodes the msg encoded by grpcMessageEncode.
+func grpcMessageDecode(msg string) string {
+	if msg == "" {
+		return ""
+	}
+	lenMsg := len(msg)
+	for i := 0; i < lenMsg; i++ {
+		if msg[i] == percentByte && i+2 < lenMsg {
+			return grpcMessageDecodeUnchecked(msg)
+		}
+	}
+	return msg
+}
+
+func grpcMessageDecodeUnchecked(msg string) string {
+	var buf bytes.Buffer
+	lenMsg := len(msg)
+	for i := 0; i < lenMsg; i++ {
+		c := msg[i]
+		if c == percentByte && i+2 < lenMsg {
+			parsed, err := strconv.ParseInt(msg[i+1:i+3], 16, 8)
+			if err != nil {
+				buf.WriteByte(c)
+			} else {
+				buf.WriteByte(byte(parsed))
+				i += 2
+			}
+		} else {
+			buf.WriteByte(c)
+		}
+	}
+	return buf.String()
+}
+
 type framer struct {
 	numWriters int32
 	reader     io.Reader
diff --git a/transport/http_util_test.go b/transport/http_util_test.go
index 279acbc5..62519490 100644
--- a/transport/http_util_test.go
+++ b/transport/http_util_test.go
@@ -107,3 +107,29 @@ func TestValidContentType(t *testing.T) {
 		}
 	}
 }
+
+func TestGrpcMessageEncode(t *testing.T) {
+	testGrpcMessageEncode(t, "my favorite character is \u0000", "my favorite character is %00")
+	testGrpcMessageEncode(t, "my favorite character is %", "my favorite character is %25")
+}
+
+func TestGrpcMessageDecode(t *testing.T) {
+	testGrpcMessageDecode(t, "Hello", "Hello")
+	testGrpcMessageDecode(t, "H%61o", "Hao")
+	testGrpcMessageDecode(t, "H%6", "H%6")
+	testGrpcMessageDecode(t, "%G0", "%G0")
+}
+
+func testGrpcMessageEncode(t *testing.T, input string, expected string) {
+	actual := grpcMessageEncode(input)
+	if expected != actual {
+		t.Errorf("grpcMessageEncode(%v) = %v, want %v", input, actual, expected)
+	}
+}
+
+func testGrpcMessageDecode(t *testing.T, input string, expected string) {
+	actual := grpcMessageDecode(input)
+	if expected != actual {
+		t.Errorf("grpcMessageDncode(%v) = %v, want %v", input, actual, expected)
+	}
+}
diff --git a/transport/transport.go b/transport/transport.go
index 84a3269a..9dade654 100644
--- a/transport/transport.go
+++ b/transport/transport.go
@@ -43,7 +43,6 @@ import (
 	"fmt"
 	"io"
 	"net"
-	"strconv"
 	"sync"
 	"time"
 
@@ -559,77 +558,3 @@ func wait(ctx context.Context, done, goAway, closing <-chan struct{}, proceed <-
 		return i, nil
 	}
 }
-
-const (
-	spaceByte   = ' '
-	tildaByte   = '~'
-	percentByte = '%'
-)
-
-// grpcMessageEncode is used to encode status code in header field
-// "grpc-message".
-// It checks to see if each individual byte in msg is an
-// allowable byte, and then either percent encoding or passing it through.
-// When percent encoding, the byte is converted into hexadecimal notation
-// with a '%' prepended.
-func grpcMessageEncode(msg string) string {
-	if msg == "" {
-		return ""
-	}
-	lenMsg := len(msg)
-	for i := 0; i < lenMsg; i++ {
-		c := msg[i]
-		if !(c >= spaceByte && c < tildaByte && c != percentByte) {
-			return grpcMessageEncodeUnchecked(msg)
-		}
-	}
-	return msg
-}
-
-func grpcMessageEncodeUnchecked(msg string) string {
-	var buf bytes.Buffer
-	lenMsg := len(msg)
-	for i := 0; i < lenMsg; i++ {
-		c := msg[i]
-		if c >= spaceByte && c < tildaByte && c != percentByte {
-			_ = buf.WriteByte(c)
-		} else {
-			_, _ = buf.WriteString(fmt.Sprintf("%%%02X", c))
-		}
-	}
-	return buf.String()
-}
-
-// grpcMessageDecode decodes the msg encoded by grpcMessageEncode.
-func grpcMessageDecode(msg string) string {
-	if msg == "" {
-		return ""
-	}
-	lenMsg := len(msg)
-	for i := 0; i < lenMsg; i++ {
-		if msg[i] == percentByte && i+2 < lenMsg {
-			return grpcMessageDecodeUnchecked(msg)
-		}
-	}
-	return msg
-}
-
-func grpcMessageDecodeUnchecked(msg string) string {
-	var buf bytes.Buffer
-	lenMsg := len(msg)
-	for i := 0; i < lenMsg; i++ {
-		c := msg[i]
-		if c == percentByte && i+2 < lenMsg {
-			parsed, err := strconv.ParseInt(msg[i+1:i+3], 16, 8)
-			if err != nil {
-				_ = buf.WriteByte(c)
-			} else {
-				_ = buf.WriteByte(byte(parsed))
-				i += 2
-			}
-		} else {
-			_ = buf.WriteByte(c)
-		}
-	}
-	return buf.String()
-}
diff --git a/transport/transport_test.go b/transport/transport_test.go
index 6e38fe17..6ad0c782 100644
--- a/transport/transport_test.go
+++ b/transport/transport_test.go
@@ -769,29 +769,3 @@ func TestIsReservedHeader(t *testing.T) {
 		}
 	}
 }
-
-func TestGrpcMessageEncode(t *testing.T) {
-	testGrpcMessageEncode(t, "my favorite character is \u0000", "my favorite character is %00")
-	testGrpcMessageEncode(t, "my favorite character is %", "my favorite character is %25")
-}
-
-func TestGrpcMessageDecode(t *testing.T) {
-	testGrpcMessageDecode(t, "Hello", "Hello")
-	testGrpcMessageDecode(t, "H%61o", "Hao")
-	testGrpcMessageDecode(t, "H%6", "H%6")
-	testGrpcMessageDecode(t, "%G0", "%G0")
-}
-
-func testGrpcMessageEncode(t *testing.T, input string, expected string) {
-	actual := grpcMessageEncode(input)
-	if expected != actual {
-		t.Errorf("grpcMessageEncode(%v) = %v, want %v", input, actual, expected)
-	}
-}
-
-func testGrpcMessageDecode(t *testing.T, input string, expected string) {
-	actual := grpcMessageDecode(input)
-	if expected != actual {
-		t.Errorf("grpcMessageDncode(%v) = %v, want %v", input, actual, expected)
-	}
-}