How to Extract Request Http Headers from a Request Using Nodejs Connect

Question

I'd like to get the "Host" header of a request made using Node JS's connect library bundle. My code looks like:

var app = connect()
  .use(connect.logger('dev'))
  .use(connect.static('public'))
  .use(function(req, res){

    var host = req.???

  })
 .listen(3000);

The documentation for connect is here but I don't see anything detailing the API of the req object in the above code.

Edit: Note a successful answer must point to the documentation (I need this to verify which version provided the API I'm looking for).

Accepted Answer

If you use Express 4.x, you can use the req.get(headerName) method as described in Express 4.x API Reference

Answer 2

To see a list of HTTP request headers, you can use :

console.log(JSON.stringify(req.headers));

to return a list in JSON format.

{
"host":"localhost:8081",
"connection":"keep-alive",
"cache-control":"max-age=0",
"accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
"upgrade-insecure-requests":"1",
"user-agent":"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.107 Safari/537.36",
"accept-encoding":"gzip, deflate, sdch",
"accept-language":"en-US,en;q=0.8,et;q=0.6"
}

Answer 3

Check output of console.log(req) or console.log(req.headers);

Answer 4

var host = req.headers['host'];

The headers are stored in a JavaScript object, with the header strings as object keys.

Likewise, the user-agent header could be obtained with

var userAgent = req.headers['user-agent'];

Answer 5

logger.info({headers:req.headers})

Output;

 "headers":{"authorization":"Basic bmluYWQ6bmluYWQ=","content-
type":"application/json","user-
agent":"PostmanRuntime/7.26.8","accept":"*/*","postman-token":"36e0d84a-
55be-4661-bb1e-1f04d9499574","host":"localhost:9012","accept-
encoding":"gzip, deflate, br","connection":"keep-alive","content-
length":"198"}

Answer 6

In express, we can use request.headers['header-name'], For example if you have set up a Bearer token in authorization header and want to retrieve the token, then you should write req.headers['authorization'], and you will get the string containing 'Bearer tokenString'.

How to Extract Request Http Headers from a Request Using Nodejs Connect

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6 Answers

Chloe Bennett