two separate send() calls, first the headers and then the data. I've now made
a fix that for static and known content that isn't to be chunked-encoded,
everything is now sent in one single system call again. This is also better
for network performance reasons.

same as using a httpproxy so we must make sure to better check for http
proxies before we do HTTP proxy stuff. This included authorization and
URI usage in the request etc.

make an adjustment to catch this.

contents. Test cases 144 and 145 were added to verify the fix.

Now we deal with return code 450 properly and other codes also do proper
cleanup.

SOCKS5 fix as suggested by Jis in bugreport #741841.

we unescape a string. We now check and decode only valid %XX strings.

variables