禁用Servlet请求实例的重用

您可以在规范中看到的内容：

3.13 Lifetime of the Request Object
Each request object is valid only within the scope of a servlet’s service method, or
within the scope of a filter’s doFilter method, unless the asynchronous processing
is enabled for the component and the startAsync method is invoked on the request
object. In the case where asynchronous processing occurs, the request object remains
valid until complete is invoked on the AsyncContext. Containers commonly recycle
request objects in order to avoid the performance overhead of request object
creation. The developer must be aware that maintaining references to request objects
for which startAsync has not been called outside the scope described above is not
recommended as it may have indeterminate results.
In case of upgrade, the above is still true

容器通常可回收请求对象，以避免请求对象的性能开销创建

它是特定于容器的。

在这种情况下，它是特定于Jetty的。