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HomeBackend DevelopmentPHP Tutorial 关于https,该如何处理

关于https
最近遇到一个新的需求,是关于https接口的, 目标接口是https, 客户端使用php开发, 我对https方面的知识还不太了解, 所以请教各位:
1.如果服务器端使用https,需要安装哪些软件?(web服务器是apache)
2.客户端需要哪些软件?
3.为什么有的https网站需要安装客户端证书,有的不需要?
4.使用php如何发起https的get请求?
------解决方案--------------------
1 不需要什么软件,但是apache需要编译或者链接openssl模块
2 浏览器
3 需要验证客户端身份的时候才需要
4 curl,有个参数是证书。但是注意这个时候php也需要编译或者链接openssl

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