Htaccess redirect 500 errors to cached version of page

I think I’m having the same problem. When many of my students are interacting with my site, I get the Internal Server error as well. We have been eliminating plugins one by one and it does seem like it is WP Super Cache (from my shared server support):

“It appears that you are using the WP Supercache plugin, and this plugin is writing 1 invalid line of code to the .htaccess, causing the internal server error.”

Is there a fix? I’ve deleted the plugin for now, but would really like to keep using it in the future.

https://thescienceroom.org

What’s the invalid line of code?

jozwikjp – If you have Apache keepalive turned on then switch it off.

Hello Donncha,
I ended up moving the site to a VPS where I had more control. The site was actually a auction event so cache content for users that are logged in is not really a option. My client opted for more dynamic solution of more hardware ?? Thank you for your hard work.

I don’t know what the line of code was because it was deleted, but I also know that the same Apache Rewrite commands were copying themselves over and over. I’ll see if I can find anything else in the meantime.

TheScienceRoom – you could always just use PHP mode, it’s near enough as fast as mod_rewrite to not make any difference.

Hi there!
I still haven’t been able to figure out what the invalid code was when using the mod_rewrite mode, but I tried the PHP mode and it crashed as well (took about 2 weeks this time before serving up a 500 error).

This time it appears the main wordpress section in the .htaccess had 2 lines put into one.

RewriteBase /
RewriteRule ^index\.php$ – [L]

The above 2 lines were written as the following.

RewriteBase / RewriteRule ^index\.php$ – [L]

Any ideas on how to prevent this from happening?

Thanks!