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SPDY + proxy_cache = occasional 499 errors

December 01, 2012 06:48PM
Hi there,

I have been piloting the SPDY patch on a separate web server pointing to an existing HTTP backend.

With just myself using this pilot web server, occasionally static resources such as css or images are not loading in Firefox (usually when pressing F5 to reload a page)

Have done a bit of digging and have learnt this so far:

When issue occurs in Firefox, access log is showing 499 errors for the missing static resources (when it should be 304)
Refreshing the page will eventually load the resources (and they will show 304 in the access log)
If I turn off the proxy cache for these static resources, the issue stops
If I turn off SPDY, the issue stops.
The issue obviously doesn't occur on the production web server running Nginx 1.2.x

Has this been seen before, or can you think of any reason why this might happen?

I don't normally use Chrome but have also witnessed this once in Chrome, so I don't think it's browser specific (however will try to get more confidence of this).

Subject Author Posted

SPDY + proxy_cache = occasional 499 errors

spdyg December 01, 2012 06:48PM

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