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: post_to_connection.rs
    path of file: ./repos/aws-sdk-rust/examples/examples/apigatewaymanagement/src/bin
    
    the code of the file until where you have to start completion: // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

#![allow(clippy::result_large_err)]

use aws_config::meta::region::RegionProviderChain;
use aws_sdk_apigatewaymanagement::primitives::Blob;
use aws_sdk_apigatewaymanagement::{config, config::Region, meta::PKG_VERSION, Client, Error};
use clap::Parser;

#[derive(Debug, Parser)]
/// AWS apigatewaymanagenent must be used with a custom endpoint, which this example demonstrates how to set.
///
/// Usage:
/// 1. Setup a Websocket API Gateway endpoint with a route configured.
/// 2. Connect to the route with `wscat`: `wscat -c wss://<api-id>.execute-api.<region>.amazonaws.com/<stage>/`
/// 3. Determine the connection ID (eg. by configuring your route to echo the connection ID into the websocket)
/// 4. Invoke this example. The `data` sent should appear in `wscat`
struct Opt {
    /// The AWS Region.
    #[structopt(short, long)]
    region: Option<String>,

    /// Whether to display additional information.
    #[structopt(short, long)]
    verbose: bool,

    /// API ID for your API.
    #[structopt(short, long)]
    api_id: String,

    /// D
    
async fn main() -> Result<(), Error> {
    tracing_subscriber::fmt::init();
    let Opt {
        region,
        verbose,
        api_id,
        stage,
        connection_id,
        data,
    } = Opt::parse();

    let region_provider = RegionProviderChain::first_try(region.map(Region::new))
        .or_default_provider()
        .or_else(Region::new("us-west-2"));
    println!();

    let region = region_provider.region().await.expect("region must be set");
    if verbose {
        println!("APIGatewayManagement client version: {}", PKG_VERSION);
        println!("Region:                              {}", region.as_ref());
        println!("API ID:                              {}", api_id);
        println!("API stage:                           {}", stage);
        println!("Connection ID:                       {}", connection_id);
        println!("Data:");
        println!("  {}", data);

        println!();
    }

    // snippet-start:[apigatewaymanagement.rust.post_to_connection_client]
    let endpoint_url = format!(
        "https://{api_id}.execute-api.{region}.amazonaws.com/{stage}",
        api_id = api_id,
        region = region,
        stage = stage
    );

    let shared_config = aws_config::from_env().region(region_provider).load().await;
    let api_management_config = config::Builder::from(&shared_config)
        .endpoint_url(endpoint_url)
        .build();
    let client = Client::from_conf(api_management_config);
    // snippet-end:[apigatewaymanagement.rust.post_to_connection_client]

    send_data(&client, &connection_id, &data).await
}