很多大型网站都是图片使用二级域名调用。
如果二级域名和主域名绑定的文件不是在一个服务器上，那么如果将主域名地址上传的图片保存到二级域名绑定文件，并返回一个绝对地址呢？
回复内容：
很多大型网站都是图片使用二级域名调用。
如果二级域名和主域名绑定的文件不是在一个服务器上，那么如果将主域名地址上传的图片保存到二级域名绑定文件，并返回一个绝对地址呢？
segmentfault不就是这么做的吗，当你上传图片后调用upyun的api图片上传到upyun后返回一个url最后展现给用户时就是用的这么CDN的url~
http://sfault-avatar.b0.upaiyun.com/405/397/4053973633-561483bccecdd_big64
如何保存到另外的服务器，这个问题要看，怎么说呢。
首先，服务器不同，你域可以相同吧，也有可能不同。
（待会儿填坑）
你把图片的编码直接丢给相应的服务器接口，服务器那边保存成文件，就可以了
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