I tried to login to my local installation of Wordpress last night and while the home page worked, the login page resulted in a blank screen and a HTTP 500 error in error_log.
I thought it might be the move to PHP 7 by Wordpress, although I was puzzled why since it worked the last time I used it. No luck, even after upgrading my PHP packages to PHP 7, the error persisted.
So I did what I should have done in the first place, I set display_errors = On in /etc/php7/apache2/php.ini. The error was then obvious:
PHP Fatal error: Uncaught Error: Call to undefined function gzinflate()
An install of the php7-zlib package fixed that.
I think the reason why it stopped working was that my web browsers started requesting gzip compression. That was why when I browsed the page with w3m, it worked.
There are lots of reasons why Wordpress might result in a HTTP 500 error. The takeaway lesson is that you should enable display_errors to get more clues. Remember to set it back after you have fixed the problem.
I thought it might be the move to PHP 7 by Wordpress, although I was puzzled why since it worked the last time I used it. No luck, even after upgrading my PHP packages to PHP 7, the error persisted.
So I did what I should have done in the first place, I set display_errors = On in /etc/php7/apache2/php.ini. The error was then obvious:
PHP Fatal error: Uncaught Error: Call to undefined function gzinflate()
An install of the php7-zlib package fixed that.
I think the reason why it stopped working was that my web browsers started requesting gzip compression. That was why when I browsed the page with w3m, it worked.
There are lots of reasons why Wordpress might result in a HTTP 500 error. The takeaway lesson is that you should enable display_errors to get more clues. Remember to set it back after you have fixed the problem.
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