What is the difference when connecting through a proxy? -


I know what a proxy is, and the basics of how it works.

What was I thinking, what is different in a request to go through a proxy?

I know that when I configure Firefox I simply configure the proxy in the dialog when I program in Python I can use an environment variable.

If I'm programming in a proxy that does not already support for proxy, how do I connect to the proxy? Has any additional header requests been added? Is the protocol slightly different?

The protocol is slightly different where there is a direct connection from example.com : 

  GET /index.html HTTP / 1.1

will ask a proxy through a connection: 

  received Http://example.com/index.html HTTP / 1.1

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