Ashiado’s solution did not work for me. My installs, even a fresh 3.8 did not show anything in that field in the database.
What did solve it for me was to go from PHP 5.5 back to PHP version 5.4. Since doing so I have no problems with any of my sites.
As a side note, no matter plugins, theme or anything else…I could upload images while still getting the HTTP error, it was that those images had no thumbnails from within the Media library.
I hope that wordpress becomes fully compatible with php 5.5
