oauth2获取HttpServletRequest

在使用Hystrix的情况下，通过RequestInterceptor获取HttpServletRequest时，有可能出现获取到的HttpServletRequest为null的情况。这是因为RequestContextHolder中的RequestAttributes是保存在ThreadLocal中，而在子线程中（包括new Thread和new线程池），是无法获取到ThreadLocal中的值的。所以，在新的线程中，尝试获取HttpServletRequest会返回null。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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