PHP local server Invalid request (Unexpected EOF)

Question

After every execution, regardless of said execution - when using Chrome web browser the PHP local server throws this error:

Invalid request (Unexpecte

Answer 1

I confirmed that @user194714's suggestion is indeed a reason (maybe not the only one though). I'm using WordPress 4.7.1 and changing wp-admin/about.php @ line 55 resolved this issue. More importantly, the page loaded faster after this simple change. I will let WordPress maintainers know.