I was experiencing this issue with some larger file uploads using the CakePHP Media plugin.
https://bugs.webkit.org/show_bug.cgi?id=5760
I added this to the virtual host declaration in my Apache config file to fix it:
123456<VirtualHost x.x.x.x:x>
# Prevent Safari from hanging on uploads
BrowserMatch Safari nokeepalive
</VirtualHost>
I had a whole site that was .htaccess password protected using Apache authentication:
12AuthType Basic
etc etc
I wanted to allow public access to a sub directory. I had to Google it for quite a while and finally worked it out. I added this to the child directory .htaccess file:
1Satisfy any
The password prompt is now gone for that [...]