diff --git a/pkg/base/content.go b/pkg/base/body.go
similarity index 63%
rename from pkg/base/content.go
rename to pkg/base/body.go
index a9a4c717..d1abcb1e 100644
--- a/pkg/base/content.go
+++ b/pkg/base/body.go
@@ -7,12 +7,12 @@ import (
 	"strconv"
 )
 
-type payload []byte
+type body []byte
 
-func (c *payload) read(rb *bufio.Reader, header Header) error {
+func (b *body) read(header Header, rb *bufio.Reader) error {
 	cls, ok := header["Content-Length"]
 	if !ok || len(cls) != 1 {
-		*c = nil
+		*b = nil
 		return nil
 	}
 
@@ -26,21 +26,21 @@ func (c *payload) read(rb *bufio.Reader, header Header) error {
 			rtspMaxContentLength, cl)
 	}
 
-	*c = make([]byte, cl)
-	n, err := io.ReadFull(rb, *c)
-	if err != nil && n != len(*c) {
+	*b = make([]byte, cl)
+	n, err := io.ReadFull(rb, *b)
+	if err != nil && n != len(*b) {
 		return err
 	}
 
 	return nil
 }
 
-func (c payload) write(bw *bufio.Writer) error {
-	if len(c) == 0 {
+func (b body) write(bw *bufio.Writer) error {
+	if len(b) == 0 {
 		return nil
 	}
 
-	_, err := bw.Write(c)
+	_, err := bw.Write(b)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/base/body_test.go b/pkg/base/body_test.go
new file mode 100644
index 00000000..65111a13
--- /dev/null
+++ b/pkg/base/body_test.go
@@ -0,0 +1,92 @@
+package base
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+var casesBody = []struct {
+	name string
+	h    Header
+	byts []byte
+}{
+	{
+		"standard",
+		Header{
+			"Content-Length": HeaderValue{"4"},
+		},
+		[]byte{0x01, 0x02, 0x03, 0x04},
+	},
+	{
+		"nil",
+		Header{},
+		[]byte(nil),
+	},
+}
+
+func TestBodyRead(t *testing.T) {
+	for _, ca := range casesBody {
+		t.Run(ca.name, func(t *testing.T) {
+			var p body
+			err := p.read(ca.h, bufio.NewReader(bytes.NewReader(ca.byts)))
+			require.NoError(t, err)
+			require.Equal(t, ca.byts, []byte(p))
+		})
+	}
+}
+
+func TestBodyWrite(t *testing.T) {
+	for _, ca := range casesBody {
+		t.Run(ca.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			bw := bufio.NewWriter(&buf)
+			err := body(ca.byts).write(bw)
+			require.NoError(t, err)
+			bw.Flush()
+			require.Equal(t, ca.byts, buf.Bytes())
+		})
+	}
+}
+
+func TestBodyReadErrors(t *testing.T) {
+	for _, ca := range []struct {
+		name string
+		h    Header
+		byts []byte
+		err  string
+	}{
+		{
+			"invalid body",
+			Header{
+				"Content-Length": HeaderValue{"17"},
+			},
+			[]byte("123"),
+			"unexpected EOF",
+		},
+		{
+			"invalid content-length",
+			Header{
+				"Content-Length": HeaderValue{"aaa"},
+			},
+			[]byte("123"),
+			"invalid Content-Length",
+		},
+		{
+			"too big content-length",
+			Header{
+				"Content-Length": HeaderValue{"1000000"},
+			},
+			[]byte("123"),
+			"Content-Length exceeds 131072 (it's 1000000)",
+		},
+	} {
+		t.Run(ca.name, func(t *testing.T) {
+			var p body
+			err := p.read(ca.h, bufio.NewReader(bytes.NewReader(ca.byts)))
+			require.Equal(t, ca.err, err.Error())
+		})
+	}
+}
diff --git a/pkg/base/request.go b/pkg/base/request.go
index 2cac79e8..b998ec59 100644
--- a/pkg/base/request.go
+++ b/pkg/base/request.go
@@ -91,7 +91,7 @@ func (req *Request) Read(rb *bufio.Reader) error {
 		return err
 	}
 
-	err = (*payload)(&req.Body).read(rb, req.Header)
+	err = (*body)(&req.Body).read(req.Header, rb)
 	if err != nil {
 		return err
 	}
@@ -137,7 +137,7 @@ func (req Request) Write(bw *bufio.Writer) error {
 		return err
 	}
 
-	err = payload(req.Body).write(bw)
+	err = body(req.Body).write(bw)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/base/request_test.go b/pkg/base/request_test.go
index cd803b50..ca2bfc5a 100644
--- a/pkg/base/request_test.go
+++ b/pkg/base/request_test.go
@@ -222,16 +222,6 @@ func TestRequestReadErrors(t *testing.T) {
 			[]byte("GET rtsp://testing123 RTSP/1.0\r\nContent-Length: 17\r\n\r\n123"),
 			"unexpected EOF",
 		},
-		{
-			"invalid content-length",
-			[]byte("GET rtsp://testing123 RTSP/1.0\r\nContent-Length: aaa\r\n\r\n123"),
-			"invalid Content-Length",
-		},
-		{
-			"too big content-length",
-			[]byte("GET rtsp://testing123 RTSP/1.0\r\nContent-Length: 1000000\r\n\r\n123"),
-			"Content-Length exceeds 131072 (it's 1000000)",
-		},
 	} {
 		t.Run(ca.name, func(t *testing.T) {
 			var req Request
diff --git a/pkg/base/response.go b/pkg/base/response.go
index 38b8886b..8a662ad0 100644
--- a/pkg/base/response.go
+++ b/pkg/base/response.go
@@ -177,7 +177,7 @@ func (res *Response) Read(rb *bufio.Reader) error {
 		return err
 	}
 
-	err = (*payload)(&res.Body).read(rb, res.Header)
+	err = (*body)(&res.Body).read(res.Header, rb)
 	if err != nil {
 		return err
 	}
@@ -228,7 +228,7 @@ func (res Response) Write(bw *bufio.Writer) error {
 		return err
 	}
 
-	err = payload(res.Body).write(bw)
+	err = body(res.Body).write(bw)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/base/response_test.go b/pkg/base/response_test.go
index 125f723c..f6bece06 100644
--- a/pkg/base/response_test.go
+++ b/pkg/base/response_test.go
@@ -179,16 +179,6 @@ func TestResponseReadErrors(t *testing.T) {
 			[]byte("RTSP/1.0 200 OK\r\nContent-Length: 17\r\n\r\n123"),
 			"unexpected EOF",
 		},
-		{
-			"invalid content-length",
-			[]byte("RTSP/1.0 200 OK\r\nContent-Length: aaa\r\n\r\n123"),
-			"invalid Content-Length",
-		},
-		{
-			"too big content-length",
-			[]byte("RTSP/1.0 200 OK\r\nContent-Length: 1000000\r\n\r\n123"),
-			"Content-Length exceeds 131072 (it's 1000000)",
-		},
 	} {
 		t.Run(ca.name, func(t *testing.T) {
 			var res Response