在使用宝塔建设多个网站时，如果建两个网站A开启SSL证书，网站B未开启SSL证书当用https访问网站B的时候会强制跳转到网站A。虽然网站B没有开始https，但是搜索引擎会收录https开头的网站B，但实际收录的内容是网站A的内容，这样会造成大量A网站的重复页面，不利于优化。
官方的说明是：在未指定SSL默认站点时,未开启SSL的站点使用HTTPS会直接访问到已开启SSL的站点，但是实际情况设置了指定了默认站点，网站还是会跳转到开启ssl的网站，有种办法是网站配置监听443端口返回403，这里给大家带来另一种方法。
这里以Nginx环境为例：
实现方法就是新建一个开启SSL不能访问的网站，设置成默认站点。
第一步
创建一个站点，域名随便一个乱也一个二级域名就行，比如 ,域名不需要解析乱填一个就行。
第二步
删除新建站点的默认的文件
默认站点根目录有一个index.html，把它删除。
第三步开启SSL
不需要申请SSL证书，随便填写一个证书就行，这里给大家一个过期的证书，目的是未了开启SSL证书随便弄个就行。
.key文件代码：
-----BEGIN RSA PRIVATE KEY-----
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k9wY3fpTvIboEsDHAdfJ74RVNzLs8Kw4pzpy6IL+PryU1mwpfSvrmkQ+bW0QedBi
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aXa4mmLTeP7b+fSpU+FA4jlo/+X2Nw3nMa77S0M4ucDOPF+craFiMA==
-----END RSA PRIVATE KEY-----
.pem文件代码：
-----BEGIN CERTIFICATE-----
MIIFfzCCBGegAwIBAgIQCWJ4ZNU3PH/Dxidtj6DcfzANBgkqhkiG9w0BAQsFADBu
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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r/T8ibXcegayrSMUFQdACqdP62cCIB80+ey+9mkrLb7BRsTBbSI3NOLrViXKXI8c
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sf2F4TP7LeDaKDRfaGvMuiuc+A==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIEqjCCA5KgAwIBAgIQAnmsRYvBskWr+YBTzSybsTANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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-----END CERTIFICATE-----
把上边的复制到宝塔网站设置SSL
填上之后点强制开始HTTPS
第四步，把新建的站点设置成默认站点。
设置完成后，在用https访问不开SSL证书的站点就会不跳转了，直接返回403错误了。
如果网站少，可以直接把所有网站都申请SSL证书，但对于很多个网站，使用这个方法还是不错的。
