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).
6 Answers
If you use Express 4.x, you can use the req.get(headerName) method as described in Express 4.x API Reference
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" } Check output of console.log(req) or console.log(req.headers);
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']; 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"} 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'.
