TUN-3505: Response body for status code origin returns EOF on Read

ingress/origin_service.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/tls"
 	"fmt"
+	"io"
 	"net"
 	"net/http"
 	"net/url"
@@ -252,8 +253,9 @@ func (o *statusCode) RoundTrip(_ *http.Request) (*http.Response, error) {
 
 type NopReadCloser struct{}
 
+// Read always returns EOF to signal end of input
 func (nrc *NopReadCloser) Read(buf []byte) (int, error) {
-	return 0, nil
+	return 0, io.EOF
 }
 
 func (nrc *NopReadCloser) Close() error {

ingress/rule_test.go

@@ -1,6 +1,8 @@
 package ingress
 
 import (
+	"io"
+	"net/http/httptest"
 	"net/url"
 	"regexp"
 	"testing"
@@ -128,9 +130,16 @@ func TestStaticHTTPStatus(t *testing.T) {
 		resp, err := o.RoundTrip(nil)
 		require.NoError(t, err)
 		_, err = resp.Body.Read(buf)
-		require.NoError(t, err)
+		require.Equal(t, io.EOF, err)
 		require.NoError(t, resp.Body.Close())
 		require.Equal(t, 404, resp.StatusCode)
+
+		resp, err = o.RoundTrip(nil)
+		require.NoError(t, err)
+		w := httptest.NewRecorder()
+		n, err := io.Copy(w, resp.Body)
+		require.NoError(t, err)
+		require.Equal(t, int64(0), n)
 	}
 	sendReq()
 	sendReq()