让前端写个全局的 fetch 和 xhr 拦截替换，像这样

```javascript
const original_fetch = window.fetch
window.fetch = (request, options) => {
if (typeof request === "string") {
request = "https://bing.com"
}else if (request instanceof Request) {
request.url = "https://bing.com"
}
return original_fetch(request, options)
}

const original_xhr_open = XMLHttpRequest.prototype.open
XMLHttpRequest.prototype.open = function(method, url, async, user, password) {
url = "https://bing.com"
return original_xhr_open.apply(this, arguments)
}

fetch("https://google.com").finally()

const xhr = new XMLHttpRequest()
xhr.open("GET", "https://google.com")
xhr.send()
```