I am trying to access content-length of response headers in app.use() middleware:
const app = express();
app.use((req, res, next) => {
//how to get content-length of res
console.log("content-length", res); //not able to access content-length
next();
})
response.headers.get('content-length')
The Content-Length header is of course unknown until the response has been finished. You must therefore execute the code that accesses it in the finish event of the response object:
app.use(function(req, res, next) {
res.on("finish", function() {
console.log(res.get("content-length"));
});
next();
});