JSF 2 -- 永久重定向 (301)

Question

我正在尝试从 JSF 中实现 301 重定向，但是当我对其进行调试时，我总是看到正在执行 302。有人能告诉我如何改变下面的方法来完成 301 吗？

/**
 * Redirect to specified destination url
 *
 * @param destination
 */
public static void permanentRedirect(String destination) {
    final ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();

    try {
        HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
        response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);

        if (!response.isCommitted()) {
            externalContext.redirect(destination);
        }
    } catch (IOException e) {
        LOGGER.debug("Could not redirect to " + destination);
    }
} 

Answer 1

你不应该调用 externalContext.redirect(destination) .它会将状态覆盖为 302。您应该手动 set the Location header和 complete the response .

externalContext.setResponseStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
externalContext.setResponseHeader("Location", destination);
facesContext.responseComplete();