High memory usage when handling large responses (PDF generation use case)

[francescobianco]

High memory usage when handling large responses (PDF generation use case)

Description
When generating PDFs (large payload), SDK loads entire response into memory.

Code snippet

result, err := apiClient.Request(ctx, "POST", baseURL, "/pdf", &buf, nil)

fmt.Println(len(result))

Issue
No streaming support (io.Reader response expected).