Hi,
i've been running a node server application which crashes probably once a
week due to an uncaught "Can't render headers ..." exception. The
skeleton of the code is like:
=================================
var
httpProxy = require('http-proxy'),
spdy = require('spdy'),
...
spdy.createServer
(
options,
function(req,res)
{
if (...)
{
...
var proxy = new httpProxy.HttpProxy({target: {host: ..., port:
...}}); // <1>
proxy.on
(
'proxyError',
function(err,req,res)
{
res.writeHead(500, {'Content-Type': 'text/plain'});
res.end('Something went wrong and we are reporting a custom
error message.');
util.log('!!!!! ProxyError received');
}
);
proxy.proxyRequest(req,res); // <2>
...
}
}
)
==========================================
In the log file, i can see the message "!!!!! ProxyError received" being
printed.
One possible cause of this problem may be related to DNS resolution, HTTP
proxy, or firewall. The crash happened at either <1> or <2> even though i
don't know for sure which. What is the proper way to guard against such
server crash in this particular case? i don't think wrap <1> and/or <2>
in a try-catch block works due to the asynchronous nature of <1> & <2>.
The stack trace looks like:
http.js:715
throw new Error('Can\'t render headers after they are sent to the
client.'
^
Error: Can't render headers after they are sent to the client.
at ServerResponse.OutgoingMessage._renderHeaders (http.js:715:11)
at ServerResponse.writeHead (http.js:1059:20)
at Socket.proxyError
(/opt/share/node_modules/http-proxy/lib/node-http-proxy/http-proxy.js:193:9)
at Socket.g (events.js:192:14)
at Socket.EventEmitter.emit (events.js:126:20)
at Socket.connect.require.lookup.addressType (net.js:699:16)
at process.startup.processNextTick.process._tickCallback
(node.js:245:9)
The node.js version in use is 0.8.22 and the OS distro is RHEL 6.2 but i
don't think the versions are to be blamed.
Thanks.
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