Is there a way to create a http server based on Fetch API? (Request, Response, Headers, ...) #4174
Closed as not planned
Description
Details
I want to create basic HTTP server with Node.js. I also want to declare request handler based on Fetch API like this:
import { serve } from 'node:http/nonexistent';
async function handler(request) {
await doSomething();
return new Response('{}', { headers: { 'content-type': 'application/json' } });
}
serve(handler, { port: 1234 });Are there any built-in packages to achieve this?
If not, how to properly use the http package and convert IncomingMessage to Request and use the Response to send response in the handler of createServer function?
Node.js version
18+
Example code
Here is my naive implementation of the serve function. I have several quetions about it:
- will such an implementation work fast enough? Or there are clear indicators of speed drawdown
- can anyone suggest what use cases i'm missing (other than error handling)?
import { createServer } from 'node:http';
import { Readable } from 'node:stream';
export function serve({ port, fetch }) {
const base = `http://localhost:${port}`;
const server = createServer(async (req, res) => {
const response = await fetch(
new Request(new URL(req.url ?? '', base), {
// body: ???
headers: toHeaders(req.headers),
}),
);
res.writeHead(response.status, [...response.headers]);
if (response.body) {
Readable.fromWeb(response.body).pipe(res);
} else {
res.end();
}
});
server.listen(port);
}
function toHeaders(headers) {
return Object.entries(headers).reduce((acc, [name, value]) => {
if (typeof value === 'string') {
acc.push([name, value]);
} else if (Array.isArray(value)) {
value.forEach(item => acc.push([name, item]));
}
return acc;
}, []);
}Operating system
macos
Scope
runtime
Module and version
Not applicable.