====== qt web engine设置请求头 ======
包含头文件：
<code cpp>
#include <QWebEngineView>
#include <QWebEngineProfile>
#include <QWebEngineUrlRequestInterceptor>
</code>
继承接口类：
<code cpp>
class requestOpt:public QWebEngineUrlRequestInterceptor{
public:
    void interceptRequest(QWebEngineUrlRequestInfo &info){
        info.setHttpHeader("key", "value");//设置请求头
    }
};
</code>
注册接口：
<code cpp>
rq = new requestOpt;
ui->web->page()->profile()->setRequestInterceptor(rq);
</code>