Alec Smrekar

Linking pull request #4645

@klausi You can do this: ```rust attack .register_scenario( scenario!("Sitemap") .register_transaction(transaction!(setup_custom_client).set_on_start()) .register_transaction(...), ) .execute() .await?; ``` ```rust async fn setup_custom_client(user: &mut GooseUser) -> TransactionResult { use reqwest::{header, Client}; let mut headers...