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Redirected Pages Keep Reloading in IE7 (Solved!)

Published on December 6, 2011

Stats spikeFor the last two weeks I've been trying to figure out why pages on Slipstick.com (and to a lesser extent, on Outlook-tips.net) kept reloading. I first realized there was a problem when the 48 hour stats tracker (from Jetpack) showed a large jump in a period. Checking the page view lists usually showed a page (or several) in the top 10 that normally receives that many views in a month. I could not repro it. I tried various other stats trackers and they did not show any pages reloading (because, as I figured out later, the pages reloaded from browser cache.)

Finally, a visitor emailed me and said she was using IE7 and a page kept reloading. At last, a repro.

Solving the problem was more difficult as only some pages were affected. Then a break: due to issues with the shared server, I disabled some plugins and decided to reduce the load in the Redirection plugin by using VBScript redirection on many of the old *.asp pages. The problem was better – the pages I used to repro stopped reloading.

Then I did two things: I moved some pages into sub-categories, which meant the URL in the VBScript was redirected by Redirection. I also wanted to see if Super Cache would cache static pages better than Total Cache. (I use custom PHP to load the Tools lists from a MS SQL server database. It makes *a lot* of SQL calls when traffic is high.) I noticed some pages were reloading once. The pages were usable since it was only a one time reload from the cache, so I didn't spend much time looking into it.

Super cache didn't work as I'd hoped and Google's webmaster tools said my page load speed shot up, so I went back to Total Cache.

Then some pages began reloading over and over, including a few that had stopped reloading. Sigh. More testing… I finally tracked it down to only pages that were redirected by Redirection. I can't disable Redirection and while I could configure IIS to handle redirection (requiring, oh, like 30 man-hours to set up the urls), I knew it was a conflict between redirection and something else. Once again, disable most plugins… no help. Total cache went next. Problem solved but the site loaded oh so slow… I re-enabled TC and started testing with cache type. Object and Database didn't have an effect… but Page caching did. With it off, the pages stopped reloading in IE 7.

Solution: I added MSIE 7.0 as a browser string (and MSIE 6.0 for good measure) that does not get served a cached page and the problem is solved. IE7 and IE6 users (up to 15% of my site visitors) will experience slower-loading pages, but at least the site will be usable, not reloading every few seconds.

I have no idea why page caching and redirection cause IE7 to reload the pages, but I've wasted enough time on it (for now). I don't understand why redirecting these pages using Redirection would cause a problem though, when pulling up the page directly (or redirecting outside of WordPress) works as expected.

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