That may cause some problems (I had), when you try to read a file (in my case was configs) in same “url position”.
About debugging using Mono, please specify that debugging won’t work if there is installed multiple versions of Unity (in my case Unity 5.0 and Unity 5.1).
Confirmed, in WebGL you currently get a stray \0 (ascii zero) character on the end of the string which can mess things up in more ways than one. This is a bug, so it wouldn’t really be correct to document this behaviour as it is not intended.
I would suggest until we release a fix, you should add code for detecting and removing this character before processing the string as normal. For example: