[ci skip]

[ci skip]

Always request last data block of exact size remaining to download if possible not the current block size.

Always do this if possible, i.e. if Content-Length or expected length is known, not only in test.
This will save unnecessary last extra loop trying to read 0 bytes.

To always ensure cookie name and value are bytestrings on python 2.

+ Add support for UTF-8 in cookie files
* Skip malformed cookie file entries instead of crashing (invalid entry len, invalid expires at)