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I've been using this module for a long time for http proxying, but since it's no longer maintained i was looking into alternatives.
For what it's worth, sharing my findings here.
Using node basic modules
My usecase: i have a expressjs app for which i want to proxy all requests to a Node process running on the same machine, on a different port. This code snippet shows how to proxy request/response including error handling.
const stream = require('stream');
const util = require('util');
const pipeline = util.promisify(stream.pipeline);
// proxyPort, req and res are passed here
// proxyPort: 5000
// req: incoming expressjs request
// res: outgoing expressjs response
// custom agent if needed
const proxyAgent = new http.Agent({
keepAlive: global.PROXY_CONFIG.useKeepAlive,
maxSockets: global.PROXY_CONFIG.maxSockets
});
// copy over url, method and headers here
const requestOptions = {
hostname: "localhost",
port: proxyPort,
path: req.url,
method: req.method,
agent: proxyAgent ,
headers: req.headers
};
// create the proxy request
const proxyReq = http.request(requestOptions, async (proxyRes) => {
// Proxy response headers
for (const headerName of Object.keys(proxyRes.headers)) {
res.setHeader(headerName, proxyRes.headers[headerName]);
}
// Proxy response status code and message
res.statusCode = proxyRes.statusCode;
res.statusMessage = proxyRes.statusMessage;
// send the response body of the proxied response to the origin response
try {
await pipeline(proxyRes, res);
} catch (err) {
// add error handling here or log it at least
res.send(500).end();
} finally {
// proxy is done here, log it?
}
});
// Proxy the request body
try {
await pipeline(req, proxyReq);
} catch (error) {
// add error handling here or log it at least
res.send(500).end();
} finally {
// The request body is fully proxied here, if you want to do anything with this information
}
This snippet doesn't offer everything this module offers, but it's easily extendable to add features like adding/removing headers from the request or response. It's all plain node code, no additional module involved.
Other proxy modules or ways to do it
- https://github.com/TooTallNate/proxy-agents/tree/main/packages/http-proxy-agent / https://github.com/TooTallNate/proxy-agents/tree/main/packages/https-proxy-agent
- https://medium.com/@glorywong1001/nodejs-http-s-proxy-0abd718b506a
I hope this is helpful to others moving away from http-proxy.
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