Function generateErrorHTML

server/error_page.go:150–175

generateErrorHTML renders the error page template with the given error information. It returns the generated HTML as a byte slice and a Content-Type string. If there is an error during template execution or if the client does not accept HTML, it falls back to generating a plain text error message w

(err errctx.Error, reqID string, h http.Header)

// If there is an error during template execution or if the client does not accept HTML,
// it falls back to generating a plain text error message with the error message and stack trace.
func generateErrorHTML(err errctx.Error, reqID string, h http.Header) ([]byte, string) {
	if !strings.Contains(h.Get(httpheaders.Accept), "text/html") {
		return generateErrorText(err)
	}

	errorChain := unwrapErrorChain(err)
	gover, commit := getBuildInfo()

	data := errorPageData{
		StatusCode:    err.StatusCode(),
		RequestID:     reqID,
		PublicMessage: err.PublicMessage(),
		Version:       version.Version,
		Commit:        commit,
		GoVersion:     gover,
		ErrorChain:    errorChain,
	}

	var buf bytes.Buffer
	if errorPageTemplate.Execute(&buf, data) != nil {
		// In case of template execution error, return the error message and stack trace as plain text.
		return generateErrorText(err)
	}

	return buf.Bytes(), "text/html; charset=utf-8"
}

func generateErrorText(err errctx.Error) ([]byte, string) {
	body := fmt.Appendf([]byte{}, "%s\n\n%s", err.Error(), err.FormatStack())