Function execute_http_once_with_host_validator 

pub async fn execute_http_once_with_host_validator<F, Fut>(
    http_data: &PreparedHttpData,
    ctx: &ExecutionContext,
    host_validator: &mut F,
) -> Result<RawExecutionResult>
where
    F: FnMut(Url) -> Fut,
    Fut: Future<Output = Result<Vec<IpAddr>>>,

Execute a single HTTP request (with redirect following) and return the result.