diff --git a/protocol/rtsp/rtsp.go b/protocol/rtsp/rtsp.go
index 6789f428..1bcd55b1 100644
--- a/protocol/rtsp/rtsp.go
+++ b/protocol/rtsp/rtsp.go
@@ -31,7 +31,6 @@ package rtsp
 import (
 	"bufio"
 	"errors"
-	"fmt"
 	"io"
 	"io/ioutil"
 	"net/http"
@@ -79,18 +78,19 @@ func (r *Request) Write(w io.Writer) error {
 
 // String returns a formatted string of the Request.
 func (r Request) String() string {
-	s := fmt.Sprintf("%s %s %s/%d.%d\r\n", r.Method, r.URL, r.Proto, r.ProtoMajor, r.ProtoMinor)
+	var b strings.Builder
+	b.WriteString(r.Method + " " + r.URL.String() + " " + r.Proto + "/" + strconv.Itoa(r.ProtoMajor) + "." + strconv.Itoa(r.ProtoMinor) + "\r\n")
 	for k, v := range r.Header {
 		for _, v := range v {
-			s += fmt.Sprintf("%s: %s\r\n", k, v)
+			b.WriteString(k + ": " + v + "\r\n")
 		}
 	}
-	s += "\r\n"
+	b.WriteString("\r\n")
 	if r.Body != nil {
-		str, _ := ioutil.ReadAll(r.Body)
-		s += string(str)
+		s, _ := ioutil.ReadAll(r.Body)
+		b.WriteString(string(s))
 	}
-	return s
+	return b.String()
 }
 
 // Response describes an RTSP response.
@@ -107,13 +107,14 @@ type Response struct {
 
 // String returns a formatted string of the Response.
 func (r Response) String() string {
-	s := fmt.Sprintf("%s/%d.%d %d %s\n", r.Proto, r.ProtoMajor, r.ProtoMinor, r.StatusCode, r.Status)
+	var b strings.Builder
+	b.WriteString(r.Proto + "/" + strconv.Itoa(r.ProtoMajor) + "." + strconv.Itoa(r.ProtoMinor) + " " + strconv.Itoa(r.StatusCode) + " " + r.Status + "\n")
 	for k, v := range r.Header {
 		for _, v := range v {
-			s += fmt.Sprintf("%s: %s\n", k, v)
+			b.WriteString(k + ": " + v + "\n")
 		}
 	}
-	return s
+	return b.String()
 }
 
 // ReadResponse will read the response of the RTSP request from the connection,