HTTP-CONNECT-syntax.txt

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                            [ CURL COMMAND LINE CONNECT OPTIONS ]

                                                                                           
To provide clarity on using curl with the CONNECT method for educational purposes, especially in a lab setting where 
using CURL to create HTTP tunnels for proxying, it's important to remember that the curl command structure given might
not directly accomplish what's expected in a traditional sense (i.e., retrieving content via a proxy using the CONNECT method).
The CONNECT method is primarily used for establishing a tunnel through a proxy, particularly for SSL/TLS traffic, and
not for fetching data as a GET request would.

However, for the sake of demonstrating various curl command constructions to attempt this with different proxies and 
conditions, here are 10 hypothetical examples. Note that in practice, the effectiveness and behavior of these commands 
will depend significantly on the configuration and permissions of the proxy servers you're using as well as the target URLs.

These examples will follow the template you provided but will vary the proxy server and add some additional curl 
options for educational variety. The $url variable should be replaced with the proxy server address, and additional
proxy details are provided via the --proxy option. The goal here would be to understand how curl's CONNECT method 
functions with different proxy settings, not necessarily to retrieve content from https://ifconfig.co directly.

getmyip="https://ifconfig.me" || getmyip="https://ifconfig.co"

Example 1: Basic Proxy Connection
curl -sLI --proxy proxy1.example.com:8080 --user-agent 'Mozilla' -X CONNECT https://ifconfig.co

Example 2: Proxy with Authentication
curl -sLI --proxy proxy2.example.com:8080 --proxy-user username:password --user-agent 'Mozilla' -X CONNECT https://ifconfig.co

Example 3: Verbose Output
curl -vLI --proxy proxy3.example.com:8080 --user-agent 'Mozilla' -X CONNECT https://ifconfig.co

Example 4: Using SOCKS5 Proxy
curl -sLI --socks5 proxy4.example.com:1080 --user-agent 'Mozilla' -X CONNECT https://ifconfig.co

Example 5: Specifying a Header
curl -sLI --proxy proxy5.example.com:8080 --user-agent 'Mozilla' -X CONNECT -H "Custom-Header: Value" https://ifconfig.co

Example 6: Proxy over HTTPS
curl -sLI --proxy https://proxy6.example.com:443 --user-agent 'Mozilla' -X CONNECT https://ifconfig.co

Example 7: Using a Different User-Agent
curl -sLI --proxy proxy7.example.com:8080 --user-agent 'Googlebot' -X CONNECT https://ifconfig.co

Example 8: Proxy with No Keep-Alive

curl -sLI --proxy proxy8.example.com:8080 --user-agent 'Mozilla' -X CONNECT -H "Connection: close" https://ifconfig.co
Example 9: Using HTTP/2

curl -sLI --proxy proxy9.example.com:8080 --user-agent 'Mozilla' -X CONNECT --http2 https://ifconfig.co
Example 10: Ignoring SSL Certificate Errors (Use with Caution)

curl -sLI --proxy proxy10.example.com:8080 --user-agent 'Mozilla' -X CONNECT --insecure https://ifconfig.co

[*] Key Points to Remember:

The actual result might not be the content of https://ifconfig.co because CONNECT is used for tunneling, not content retrieval.
The effectiveness and response from using the CONNECT method in this way will heavily depend on the configuration of the proxy servers
and the permissions set by network administrators.

--- Tip:
Remember to use options to get potentially working command by *always* setting --user-agent 'Kona' (kona = WAF it seems to help)
Verify whats going on with -I (show headers)