//! Typed config builders for every Scrapfly endpoint.
//!
//! - `scrape` → query-param based (`to_query_pairs`)
//! - `screenshot` → query-param based
//! - `extraction` → JSON body + query params
//! - `crawler` → JSON body with bounds validation
use Engine;
/// URL-safe base64 without padding, matching `sdk/go/utils.go::urlSafeB64Encode`.
pub