You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client.rs
    path of file: ./repos/aws-sdk-rust/sdk/cloudfrontkeyvaluestore/src
    
    the code of the file until where you have to start completion: // Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.
#[derive(Debug)]
pub(crate) struct Handle {
    pub(crate) conf: crate::Config,
    #[allow(dead_code)] // unused when a service does not provide any operations
    pub(crate) runtime_plugins: ::aws_smithy_runtime_api::client::runtime_plugin::RuntimePlugins,
}

/// Client for Amazon CloudFront KeyValueStore
///
/// Client for invoking operations on Amazon CloudFront KeyValueStore. Each operation on Amazon CloudFront KeyValueStore is a method on this
/// 
    
/// # async fn wrapper() -> ::std::result::Result<(), aws_sdk_cloudfrontkeyvaluestore::Error> {
/// # let client: aws_sdk_cloudfrontkeyvaluestore::Client = unimplemented!();
/// use ::http::header::{HeaderName, HeaderValue};
///
/// let result = client.delete_key()
///     .customize()
///     .mutate_request(|req| {
///         // Add `x-example-header` with value
///         req.headers_mut()
///             .insert(
///                 HeaderName::from_static("x-example-header"),
///                 HeaderValue::from_static("1"),
///             );
///     })
///     .send()
///     .await;
/// # }