Accessing the web page's HTTP Headers in JavaScript

Question

How do I access a page\'s HTTP response headers via JavaScript?

Related to this question, which was modified to ask about accessing two specific HTTP headers.

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Answer 1

As has already been mentioned, if you control the server side then it should be possible to send the initial request headers back to the client in the initial response.

In Express, for example, the following works:

app.get('/somepage', (req, res) => { res.render('somepage.hbs', {headers: req.headers}); }) The headers are then available within the template, so could be hidden visually but included in the markup and read by clientside javascript.