Re: [nodejs] HTTP request method getting mangled. Is this a bug in my code, or in http.request?

Alex Kocharin Mon, 23 Dec 2013 17:25:12 -0800

Yes, probably.

Can you create a simple test without all this fancy express.js stuff?

23.12.2013, 23:19, "Jacob Beard" <[email protected]>:

Would it be worth filing a bug report for this issue? It doesn't seem like the core HTTP client should ever mangle requests like this.

On Monday, December 23, 2013 2:00:11 PM UTC-5, Matt Sergeant wrote:
Mikeal's request library wraps the sending of data around a process.nextTick(). Try that.

On Mon, Dec 23, 2013 at 12:02 PM, Jacob Beard <[email protected]> wrote:
Hi,

I've noticed a strange behavior in node's http.request module.

I'm using node's built-in http module to make an HTTP request inside an express handler. I believe I'm using http.request fairly conventionally. Here is a code snippet:
app.post('/api/:userId/attachments/:examName/:attachmentName/render',function(req,res){

var htmlToSend = '';

req.on('data',function(s){
  htmlToSend += s;
});

req.on('end',function(){

var pdfGeneratorRequest =
http.request({
host : PDF_GEN_HOST,
path : '/cgi-bin/render.cgi',
method : 'POST',
headers : {
'content-length' : htmlToSend.length,
'content-type' : 'text/html'
}
}, function(pdfGeneratorResponse) {
//handle the response
})

pdfGeneratorRequest.on('error',function(e){
var m = 'Error making request to PDF generator server';
console.log(m,e);
res.send(500,{error : m, message : e.message});
});

pdfGeneratorRequest.end(htmlToSend);
});

What I am finding, however, is that when the express server receives six or more of these requests concurrently, nodejs mangles one of the HTTP requests.

Here is an example of what shows up in the Apache log of the server receiving the request:

10.181.194.183 - - [23/Dec/2013:16:14:03 +0000] "POST /cgi-bin/render.cgi HTTP/1.1" 200 99865 "-" "-" 10.181.194.183 - - [23/Dec/2013:16:14:16 +0000] "POST /cgi-bin/render.cgi HTTP/1.1" 200 19742 "-" "-"
10.181.194.183 - - [23/Dec/2013:16:14:16 +0000] "POST /cgi-bin/render.cgi HTTP/1.1" 200 19741 "-" "-"
10.181.194.183 - - [23/Dec/2013:16:14:15 +0000] "POST /cgi-bin/render.cgi HTTP/1.1" 200 99865 "-" "-"
10.181.194.183 - - [23/Dec/2013:16:14:15 +0000] "POST /cgi-bin/render.cgi HTTP/1.1" 200 99867 "-" "-"
10.181.194.183 - - [23/Dec/2013:16:14:17 +0000] "ML>POST /cgi-bin/render.cgi HTTP/1.1" 400 25 "-" "-"
10.181.194.183 - - [23/Dec/2013:16:14:16 +0000] "POST /cgi-bin/render.cgi HTTP/1.1" 200 99867 "-" "-"

Wireshark seems to confirm that the request HTTP method is getting mangled:

This occurs on node 0.10.24 on OS X 10.8.5

I'd appreciate any guidance anyone can offer as to why this might be occurring and how to resolve it.

Thanks,

Jake

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Re: [nodejs] HTTP request method getting mangled. Is this a bug in my code, or in http.request?

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