Java GMail API 是线程安全的吗？
Is Java GMail API thread-safe?
特别是，多个线程可以使用同一个GMail服务实例吗？
没有。 Gmail 实现不是线程安全的。
Therefore, if you are running as a multi-threaded application, each
thread that you are making requests from must have its own instance of
httplib2.Http().
资源Link：gmail api service
特别是，多个线程可以使用同一个GMail服务实例吗？
没有。 Gmail 实现不是线程安全的。
Therefore, if you are running as a multi-threaded application, each thread that you are making requests from must have its own instance of
httplib2.Http().
资源Link：gmail api service