CF workers反代Heroku

CF workers反代Heroku代码

// 单日
const SingleDay = '111.herokuapp.com'
// 双日
const DoubleDay = '222.herokuapp.com'
// 一切给CF代理，true/false
const CFproxy = true
// 由于heroku不绑卡不能自定义域名，就算绑卡后https也不方便
// 另外免费套餐每月550小时，有些人不够用
// 于是在CF Workers使用此代码，分单双日拉取不同heroku帐号下的相同网页
// 只改上面，下面不用动
addEventListener('fetch', event => {
    let nd = new Date();
    if (nd.getDate()%2) {
        host = SingleDay
    } else {
        host = DoubleDay
    }
    if (!CFproxy) {
        let url=new URL(event.request.url);
        if (url.protocol == 'http:') {
            url.protocol = 'https:'
            response = Response.redirect(url.href);
            event.respondWith( response );
        } else {
            url.hostname=host;
            let request=new Request(url,event.request);
            event.respondWith( fetch(request) )
        }
    } else {
        event.respondWith( fetchAndApply(event.request) );
    }
})
async function fetchAndApply(request) {
    let response = null;
    let url = new URL(request.url);
    if (url.protocol == 'http:') {
        url.protocol = 'https:'
        response = Response.redirect(url.href);
        return response;
    }
    url.host = host;
    let method = request.method;
    let body = request.body;
    let request_headers = request.headers;
    let new_request_headers = new Headers(request_headers);
    new_request_headers.set('Host', url.host);
    new_request_headers.set('Referer', request.url);
    let original_response = await fetch(url.href, {
        method: method,
        body: body,
        headers: new_request_headers
    });
    response = new Response(original_response.body, {
        status: original_response.status,
        headers: original_response.headers
    })
    return response;
}