escape the ' properly

.IP "Environment Variables"

libcurl automatically checks and uses a set of environment variables to

know what proxies to use for certain protocols. The names of the variables

are following an ancient de facto standard and are built up as

"[protocol]_proxy" (note the lower casing). Which makes the variable

'http_proxy' checked for a name of a proxy to use when the input URL is

HTTP. Following the same rule, the variable named 'ftp_proxy' is checked

for FTP URLs. Again, the proxies are always HTTP proxies, the different

names of the variables simply allows different HTTP proxies to be used.

libcurl automatically checks and uses a set of environment variables to know

what proxies to use for certain protocols. The names of the variables are

following an ancient de facto standard and are built up as "[protocol]_proxy"

(note the lower casing). Which makes the variable \&'http_proxy' checked for a

name of a proxy to use when the input URL is HTTP. Following the same rule,

the variable named 'ftp_proxy' is checked for FTP URLs. Again, the proxies are

always HTTP proxies, the different names of the variables simply allows

different HTTP proxies to be used.

The proxy environment variable contents should be in the format

\&"[protocol://][user:password@]machine[:port]". Where the protocol:// part is