ajax跨域，这应该是最全的解决方案了

<param-value>GET, HEAD, POST, OPTIONS</param-value>

</init-param>

<init-param>

<param-name>cors.supportedHeaders</param-name>

<param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value>

</init-param>

<init-param>

<param-name>cors.exposedHeaders</param-name>

<param-value>X-Test-1, X-Test-2</param-value>

</init-param>

<init-param>

<param-name>cors.supportsCredentials</param-name>

<param-value>true</param-value>

</init-param>

<init-param>

<param-name>cors.maxAge</param-name>

<param-value>3600</param-value>

</init-param>

</filter>

<filter-mapping>

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