There is a head string in Http protocol named "Proxy-Authorization"
I write wrong last time
Any request for internet throught Proxy must have this head
The proxy got the string after "Proxy-Authorization: basic " to
check you identity.
The basic means Basic Authentication Scheme
For example:
User-Name: Daio
Password: 11111
then string "Daio:11111" will be encoded use the base64encode Function
And you got the result "*********"
A head string in http request will be
Proxy-Authorization: basic *********
Look up the RFC2068 for more information
You could download it from the internet
Good luck!