工作箱!== 服务人员。 Workbox 构建在 Service Worker 之上,但原始 Service Worker 让您可以完全控制请求和响应,因此您几乎可以做任何您想做的事情。
编辑回复
您可以通过以下方式更改回复的文本:
addEventListener('fetch', event => {
event.respondWith(async function() {
// Get a cached response:
const cachedResponse = await caches.match('/');
// Get the text of the response:
const responseText = await cachedResponse.text();
// Change it:
const newText = responseText.replace(/Hello/g, 'Goodbye');
// Serve it:
return new Response(newText, cachedResponse);
}());
});
这里存在一个潜在的性能问题,即您最终会在提供第一个字节之前将完整的响应加载到内存中并进行替换工作。稍加努力,您就可以以流式方式进行替换:
function streamingReplace(find, replace) {
let buffer = '';
return new TransformStream({
transform(chunk, controller) {
buffer += chunk;
let outChunk = '';
while (true) {
const index = buffer.indexOf(find);
if (index === -1) break;
outChunk += buffer.slice(0, index) + replace;
buffer = buffer.slice(index + find.length);
}
outChunk += buffer.slice(0, -(find.length - 1));
buffer = buffer.slice(-(find.length - 1));
controller.enqueue(outChunk);
},
flush(controller) {
if (buffer) controller.enqueue(buffer);
}
})
}
addEventListener('fetch', event => {
const url = new URL(event.request.url);
if (!(url.origin === location.origin && url.pathname === '/sw-content-change/')) return;
event.respondWith((async function() {
const response = await fetch(event.request);
const bodyStream = response.body
.pipeThrough(new TextDecoderStream())
.pipeThrough(streamingReplace('Hello', 'Goodbye'))
.pipeThrough(new TextEncoderStream());
return new Response(bodyStream, response);
})());
});
Here's a live demo of the above.
获取响应的 POST 参数
您需要的另一部分是获取响应的 POST 正文:
addEventListener('fetch', event => {
event.respondWith(async function() {
if (event.request.method !== 'POST') return;
const formData = await event.request.formData();
// Do whatever you want with the form data…
console.log(formData.get('foo'));
}());
});
有关 API,请参阅 MDN page for FormData。