Reusing a client in Rust

One Client, configured once: connection pooling, timeouts, default headers.

use std::time::Duration;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::builder()
        .timeout(Duration::from_secs(10))
        .user_agent("typestar-cli/2.1")
        .build()?;

    for path in ["healthz", "api/paths?lang=rust"] {
        let url = format!("https://typestar.io/{path}");
        let status = client.get(&url).send().await?.status();
        println!("{status} {path}");
    }
    Ok(())
}

How it works

1. Building a client per request throws away the pool.
2. timeout bounds the whole request.
3. Default headers apply to everything the client sends.

Keywords and builtins used here

• Box
• Ok
• Result
• async
• await
• dyn
• fn
• for
• in
• let
• main
• use

The run, in numbers

Lines

16

Characters to type

410

Tokens

124

Three-star pace

110 tpm

At the three-star pace of 110 tokens a minute, this run takes about 68 seconds.

Type this snippet

Step 5 of 5 in Requests with reqwest, step 11 of 12 in CLI tools & HTTP clients.

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