Function ensure_file_exists_or_download_http_with_timeout 

pub fn ensure_file_exists_or_download_http_with_timeout(
    filepath: &Path,
    url: &str,
    checksums: Option<&Path>,
    timeout_secs: u64,
) -> Result<()>

Ensures that a file exists at the specified path by downloading it if necessary, with a custom timeout.

Errors

Returns an error if:

• The HTTP request cannot be sent or returns a non-success status code after retries.
• Any I/O operation fails during file creation, reading, or writing.
• Checksum verification or JSON parsing fails.