func (er *errorRewritingRoundTripper) RoundTrip(req *http.Request) (resp *http.Response, err error) {
res, err := er.orig.RoundTrip(req)
if err != nil {
var htmlerr []byte
// If the request has an 'Accept' header preferring HTML, or
// doesn't have that header at all, render the error page.
switch req.Header.Get("Accept") {
case "text/html":
fallthrough
case "application/xhtml+xml":
fallthrough
case "":
// It is likely we will have lots of different errors to handle but for now
// we will only return a ErrorAccessingPage error. This prevents the user
// from getting just a blank screen.
htmlerr, err = status.ErrorAccessingPage(req.Host, err)
if err != nil {
log.Debugf("Got error while generating status page: %q", err)
}
default:
// We know for sure that the requested resource is not HTML page,
// wrap the error message in http content, or http.ReverseProxy
// will response 500 Internal Server Error instead.
htmlerr = []byte(err.Error())
}
res = &http.Response{
Body: ioutil.NopCloser(bytes.NewBuffer(htmlerr)),
}
res.StatusCode = http.StatusServiceUnavailable
return res, nil
}
return res, err
}
func (er *errorRewritingRoundTripper) RoundTrip(req *http.Request) (resp *http.Response, err error) {
res, err := er.orig.RoundTrip(req)
if err != nil {
// It is likely we will have lots of different errors to handle but for now
// we will only return a ErrorAccessingPage error. This prevents the user
// from getting just a blank screen.
htmlerr, err := status.ErrorAccessingPage(req.Host, err)
if err != nil {
log.Debugf("Got error while generating status page: %q", err)
}
res = &http.Response{
Body: ioutil.NopCloser(bytes.NewBuffer(htmlerr)),
}
res.StatusCode = http.StatusServiceUnavailable
return res, nil
}
return res, err
}