spring oauth重定向流程

OAuth2ClientContextFilter会抛出异常，然后在catch里进行重定向

        try {
            chain.doFilter(servletRequest, servletResponse);
        } catch (IOException ex) {
            throw ex;
        } catch (Exception ex) {
            // Try to extract a SpringSecurityException from the stacktrace
            Throwable[] causeChain = throwableAnalyzer.determineCauseChain(ex);
            UserRedirectRequiredException redirect = (UserRedirectRequiredException) throwableAnalyzer
                    .getFirstThrowableOfType(
                            UserRedirectRequiredException.class, causeChain);
            if (redirect != null) {
                redirectUser(redirect, request, response);
            } else {

                throw new NestedServletException("Unhandled exception", ex);
            }
        }

UserRedirectRequiredException 包含了需要重定向的所有信息：
核心的就是redirect url

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