<httpRuntime requestValidationMode="2.0" maxRequestLength="524288000" useFullyQualifiedRedirectUrl="false" executionTimeout="3600" maxQueryStringLength="102400"/>
 <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="1048576000" maxQueryString="102400"  />
      </requestFiltering>
    </security>     
  </system.webServer>
  <system.webServer>
maxAllowedContentLength=xxxxxx 单位k
转载:https://www.cnblogs.com/pukua/p/12598091.html
原文:https://www.cnblogs.com/yeyuqian/p/12698591.html