Azure + WordpPress + WP Super Cache: 502 – Web server received an invalid response while acting as a gateway or proxy server

While I’m working on my new blog (this blog 🙂 ), I started to face an issue. In random instances, I started to get this error from the browser.

First I thought this is an issue on Azure and tried to find a fix for it. But I couldn’t able to find any clue which points this issue to Azure. When I searched little bit more about it, I found that it’s issue in WordPress cache or cache configuration.

I found this blog for fix same issue when you use WP Total Cache but it didn’t help me as I expected because configuration of these two plug-ins were very different.

Finally I found a solution from MSDN Forums, and after I changed the settings as it said, I was able to get rid of this issue. Required changes are as below:

  • Go to WP Super Cache Settings page
  • Go to Advanced Settings
  • Uncheck “304 Not Modified browser caching. Indicate when a page has not been modified since last requested.”
  • Uncheck “Extra homepage checks.”

This solved the above mentioned issue for me. 🙂