解除不必要的同步，之前的同步会导致严重性能问题。 #384
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之前对于executeInternal全部使用了synchronized，导致在大量用户登录的时候，由于http本身的操作时延，造成大量阻塞，导致系统无法使用。
实际上大量的synchronized 都可以去除，特别对于token的操作，建议由独立进程刷新，也可以通过类似guavaCache的方式，确保token随时可用。