Add Request.TLS and try to avoid a new alloc if Request.Header is alr…

…eady allocated (#1034)

fasthttpadaptor/request.go

@@ -12,7 +12,10 @@ import (
 // ConvertRequest convert a fasthttp.Request to an http.Request
 // forServer should be set to true when the http.Request is going to passed to a http.Handler.
 func ConvertRequest(ctx *fasthttp.RequestCtx, r *http.Request, forServer bool) error {
-	rURL, err := url.ParseRequestURI(string(ctx.RequestURI()))
+	body := ctx.PostBody()
+	strRequestURI := string(ctx.RequestURI())
+
+	rURL, err := url.ParseRequestURI(strRequestURI)
 	if err != nil {
 		return err
 	}
@@ -21,28 +24,36 @@ func ConvertRequest(ctx *fasthttp.RequestCtx, r *http.Request, forServer bool) e
 	r.Proto = "HTTP/1.1"
 	r.ProtoMajor = 1
 	r.ProtoMinor = 1
-	r.ContentLength = int64(len(ctx.PostBody()))
+	r.ContentLength = int64(len(body))
 	r.RemoteAddr = ctx.RemoteAddr().String()
 	r.Host = string(ctx.Host())
+	r.TLS = ctx.TLSConnectionState()
+	r.Body = ioutil.NopCloser(bytes.NewReader(body))
+	r.URL = rURL
 
 	if forServer {
-		r.RequestURI = string(ctx.RequestURI())
+		r.RequestURI = strRequestURI
+	}
+
+	if r.Header == nil {
+		r.Header = make(http.Header)
+	} else if len(r.Header) > 0 {
+		for k := range r.Header {
+			delete(r.Header, k)
+		}
 	}
 
-	hdr := make(http.Header)
 	ctx.Request.Header.VisitAll(func(k, v []byte) {
 		sk := string(k)
 		sv := string(v)
+
 		switch sk {
 		case "Transfer-Encoding":
 			r.TransferEncoding = append(r.TransferEncoding, sv)
 		default:
-			hdr.Set(sk, sv)
+			r.Header.Set(sk, sv)
 		}
 	})
 
-	r.Header = hdr
-	r.Body = ioutil.NopCloser(bytes.NewReader(ctx.PostBody()))
-	r.URL = rURL
 	return nil
 }