数据压缩
<httpCompression>节点用于配置静态压缩和动态压缩，<urlCompression>则用于开关 http压缩
<urlCompression doStaticCompression="true" />
<httpCompression directory="%SystemDrive%\websites\_compressed" minFileSizeForComp="1024">
<scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
<staticTypes>
<add mimeType="text/*" enabled="true" />
<add mimeType="message/*" enabled="true" />
<add mimeType="application/javascript" enabled="true" />
<add mimeType="application/json" enabled="true" />
<add mimeType="*/*" enabled="false" />
</staticTypes>
</httpCompression>
security
maxAllowedContentLength设置上传文件的最大值，allowDoubleEscaping是否检查URL含有+号的情况
<security>
<requestFiltering allowDoubleEscaping="true">
<requestLimits maxAllowedContentLength="10000000" />
</requestFiltering>
</security>
mailSettings
主要有利于SmtpClient，如果把配置写在APPSetting中需要手动去填充参数，如果使用mailSettings，情况就变得非常简单
smtp = new SmtpClient(); smtp.Send(msg);
<system.net>
<mailSettings>
<smtp from="lnred@lexisnexis.com.au">
<network host="smtp.sendgrid.net" port="25"
userName="azure_b1d335d1d151b1708ffa17cfabc2ad3d@azure.com"
password="onr4qv2s" />
</smtp>
</mailSettings>
<defaultProxy enabled="true" />
</system.net>
httpProtocol
貌似Remove Server不起作用
<httpProtocol>
<customHeaders>
<!--<add name="Arr-Disable-Session-Affinity" value="true" />-->
<remove name="Server" />
<remove name="X-Powered-By" />
<remove name="X-AspNet-Version" />
<add name="X-UA-Compatible" value="IE=EmulateIE7" />
</customHeaders>
</httpProtocol>
system.web
maxRequestLength和maxAllowedContentLength具有相似的目的，
建议设置成相同的值，具体参考https://forums.iis.net/t/1169846.aspx
<system.web>
<compilation targetFramework="4.6" debug="false" />
<httpRuntime targetFramework="4.6" maxRequestLength="10000" maxUrlLength="1024" />
<customErrors mode="RemoteOnly" defaultRedirect="~/error.html" />
</system.web>