How do I set a MIME type before sending a file in Node.js?

Question

When sending scripts from my Node.js server to the browser, in Google Chrome, I get this warning:

Resource interpreted as Script but transferred with MIME type text/plain

I Google'd around, and found out that it's a server-side problem, namely, I think that I should set the correct MIME type to things, before sending them. Here's the HTTP server's handler:

var handler = function(req, res) {     url = convertURL(req.url); //I implemented "virtual directories", ignore this.      if (okURL(url)) //If it isn't forbidden (e.g. forbidden/passwd.txt)     {         fs.readFile (url, function(err, data)         {             if (err)             {                 res.writeHead(404);                 return res.end("File not found.");             }              //I think that I need something here.             res.writeHead(200);             res.end(data);         });     }     else //The user is requesting an out-of-bounds file.     {         res.writeHead(403);         return res.end("Forbidden.");     } } 

Question: How do I correct my server-side code to configure the MIME type correctly?

(Note: I already found https://github.com/broofa/node-mime, but it only lets me determine the MIME type, not to "set" it.)

Answer 1

I figured it out!

Thanks to @rdrey's link and this node module I managed to correctly set the MIME type of the response, like this:

function handler(req, res) {     var url = convertURL(req.url);      if (okURL(url)) {         fs.readFile(url, function(err, data) {             if (err) {                 res.writeHead(404);                 return res.end("File not found.");             }              res.setHeader("Content-Type", mime.lookup(url)); //Solution!             res.writeHead(200);             res.end(data);         });     } else {         res.writeHead(403);         return res.end("Forbidden.");     } } 

Answer 2

Search google for the Content-Type HTTP header.

Then figure out how to set it with http://expressjs.com/api.html#res.set

Oops, the example includes your answer ;)

Simply check the file ending, if it's .js, set the appropriate MIME type to make browsers happy.

EDIT: In case this is pure node, without express, look here: http://nodejs.org/api/http.html#http_response_setheader_name_value