Sending Headers?

[djlerman]

Hello.

I've tried various ways to send a header and I get errors. What is the preferred way to send a header?

This is the error I get:
EXCEPTION: header is not defined

Here is what I'm trying to do.

<?
var http  = require('http');
var fs    = require('fs');

fs.readFile('/home/userName/var/lib/images/image.jpg', function(err, data) {
  if (err) throw err; // Fail if the file can't be read.
  header('Content-Type', 'image/jpeg');
  write(data);
});
?>

[jaszhix]

I would try this instead:

response.headers = {'Content-Type': 'image/jpeg'};

[djlerman]

I moved the response.headers outside of the function and added header for 'Content-Length'.

I got a little bit further. Any suggestions on how to get passed this error?

Now it is returning the error:

The image "https://www.iqaat.com/testScripts/image1.jss" cannot be displayed because it contains errors.

<?
  var fs      = require('fs');

  var stats = fs.statSync('/home/userName/var/lib/images/image.jpg');
  var fileSizeInBytes = stats["size"];

  response.headers = {'Content-Type': 'image/jpeg'};
  response.headers['Content-Length'] = fileSizeInBytes;
  response.sendHeaders();

  fs.readFile('/home/userName/var/lib/images/image.jpg', function(err, data) {
    if (err) throw err; // Fail if the file can't be read.

    response.write(data);
  });
?>

[jaszhix]

Not sure what could be the issue, but you could try writing some vars to a debug log. Try this...

function log (data) {
  var timeNow = new Date(Date.now());
  var timeStamp = timeNow.toTimeString();
  var json = {
    time: timeStamp,
    data: data
  };
  var output = JSON.stringify(json);
  fs.appendFile('../api/debug.log', output + '\n', {flags : 'w'});
}

Then log(var).

[jaszhix]

I tried loading that image, and it returned this.

^Q?t
95{[
xV-C
Oird
\F=I
<br/><div style="color:red"><b>EXCEPTION</b>: undefined is not a function<i><pre>TypeError: undefined is not a function
    at CgiHttpResponse.end (/home1/iqaatcom/public_html/cgi-bin/cgi-node.js:493:11)
    at /home1/iqaatcom/public_html/testScripts/image1.jss:15:14
    at fs.js:340:14
    at FSReqWrap.oncomplete (fs.js:101:15)</pre></i></div></br>

That gives you a line number. Also try moving everything but the headers to a separate file using include('file.js'). Put response.sendHeaders(); at the end of your JSS file.

[djlerman]

How did you get all of the extra return text? That would be helpful with trying to get this to work.

[jaszhix]

I used cURL, but can't reproduce the error. I suspect your headers are wrong. Try changing your content-type to text/html. Use the log function I pasted to debug the code. Good luck!

[djlerman]

The only thing I can think of, is that CgiHttpRequest and CgiHttpResponse are not ready yet so something is not working on sending the data and ending the request. I'll have to use PHP until they are ready. :-(

Is there a time frame for the next release?

[jaszhix]

No, the author isn't maintaining this repo. I have no part in cgi-node development. That you can see an error from cgi-node in curl would suggest its your code, not the cgi wrapper. Undefined means one of your variables are not returning the value they are supposed to. My guess is you used two fs calls on the same file and the encoding for the image is binary, something cgi-node can't handle by itself. You could try a helper such as node-image.