Add `CURLINFO_PRIMARY_IP` and `CURLINFO_PRIMARY_PORT` to `cpr::Response`

[gitpaladin]

Is your feature request related to a problem?

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Possible Solution

Feature Request: Add CURLINFO_PRIMARY_IP and CURLINFO_PRIMARY_PORT to cpr::Response

What

As a developer using CPR for HTTP requests, I need to access the resolved IP address and port of the target endpoint after making a request. This capability is crucial for monitoring, logging, and reporting purposes. Currently, CPR does not expose these details in the cpr::Response object.

Why

Having access to the resolved IP and port is highly valuable for:

• Accurate monitoring of network traffic
• Detailed logging for debugging and auditing
• Proper reporting in distributed systems
• Security compliance and tracking

This feature is commonly required in production environments and would significantly enhance CPR's utility for enterprise and large-scale applications.

Possible Solution

Extend the cpr::Response object to include the resolved IP and port by retrieving them during response creation:

std::string ip;
long port;
curl_easy_getinfo(curl, CURLINFO_PRIMARY_IP, &ip);
curl_easy_getinfo(curl, CURLINFO_PRIMARY_PORT, &port);

These values should be stored in the cpr::Response object and made accessible via new member functions like GetPrimaryIP() and GetPrimaryPort().

Alternatives

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Additional Context

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