<system.web>
<httpRuntime requestValidationMode="2.0" maxRequestLength="3072" ></httpRuntime>
<!--单位:KB 3072=3MB 默认是4MB,最大支持2GB-->
</system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="2147483648" />
<!--单位:字节B 2147483648=2 GB 默认是4MB,最大支持2GB-->
</requestFiltering>
</security>
</system.webServer>