In our project we’re using the “http-proxy-middleware”(https://www.npmjs.com/package/http-proxy-middleware) npm package for proxy.
There is the “onProxyRes” function to subscribe to http-proxy’s event.
And there is an example of that function:
function onProxyRes(proxyRes, req, res) { proxyRes.headers['x-added'] = 'foobar' // add new header to response delete proxyRes.headers['x-removed'] // remove header from response }
I’m just interesting is it possible somehow based on proxyRes write changed response in res object and do not copy data directly from proxyRes object?
Just example:
proxyRes(readable stream contains the following data: {“url”: “http://domain/test“}, I’d like to modify that response and have res with data like that: {{“url”: “http://changedDomain/test“}} and do not copy data from proxyRes directly
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Answer
Maybe it looks ugly little bit, but I’m able to manage that with the following code:
function onProxyRes(proxyResponse, request, serverResponse) { var body = ""; var _write = serverResponse.write; proxyResponse.on('data', function (chunk) { body += chunk; }); serverResponse.write = function (data) { try{ var jsonData = JSON.parse(data); // here we can modify jsonData var buf = Buffer.from(JSON.stringify(jsonData), 'utf-8'); _write.call(serverResponse,buf); } catch (err) { console.log(err); } } }