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Possible HTTP response read bug in Nginx 1.0.12

April 03, 2012 07:07AM
Hi,

I've nginx server setup that terminates SSL connections from clients and forwards plain HTTP requests to backend servers. Some of these requests can last pretty long (up to 1 minute) and usually get very short 15 byte reply. (Ajax polling)

However, we see often these kind of errors that indicate that backend servers would have disconnected socket while writing reply.

2012/03/03 06:46:38 [error] 13394#0: *2100 upstream prematurely closed connection while reading response header from upstream, client: XX.XX.XX.XX, server: secure.example.com, request: "GET /url/example?par=12345 HTTP/1.1", upstream: "http://127.0.0.1:8082/url/example?par=12345", host: "secure.example.com", referrer: "https://secure.example.com/"

Strangely I can see correponding 200 OK responses from our server logs at the same timestamp, so at least backend server is trying to respond correctly.
Then we captured the traffic between nginx and backend server with wireshark and noticed that when this happens the response from server is actually sent in two TCP packets.

The first packet has headers and the second packet has small 15 byte HTTP body. I suspect that nginx fails to read the second packet in some conditions and thinks backend server disconnected prematurely.

Any insights? Thanks!
Subject Author Posted

Possible HTTP response read bug in Nginx 1.0.12

tikonen April 03, 2012 07:07AM

Re: Possible HTTP response read bug in Nginx 1.0.12

Maxim Dounin April 03, 2012 12:16PM

Re: Possible HTTP response read bug in Nginx 1.0.12

tikonen April 03, 2012 09:06PM

Re: Possible HTTP response read bug in Nginx 1.0.12

tikonen May 18, 2012 10:29PM

Re: Possible HTTP response read bug in Nginx 1.0.12

Maxim Dounin April 04, 2012 07:12AM

Re: Possible HTTP response read bug in Nginx 1.0.12

tikonen April 04, 2012 04:12AM



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