make a http options request in rust

To make an HTTP OPTIONS request in Rust, we can use the reqwest library. Here's an example:

main.rs
use reqwest::header::USER_AGENT;

async fn make_request() -> Result<(), reqwest::Error> {
    let response = reqwest::Client::new()
        .options("https://www.example.com")
        .header(USER_AGENT, "reqwest")
        .send()
        .await?;

    // Do something with the response...
    println!("{:#?}", response);

    Ok(())
}
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In this example, we're using the reqwest library to create an HTTP OPTIONS request to https://www.example.com. We're also setting a USER_AGENT header for the request.

We then send the request using the .send() method and await the response. Finally, we print out the response for debugging purposes.

You can also use the curl crate to make an HTTP OPTIONS request:

main.rs
use std::io::stdout;
use curl::easy::Easy;

fn make_request() -> Result<(), curl::Error> {
    let mut easy = Easy::new();
    easy.url("https://www.example.com")?;
    easy.custom_request("OPTIONS")?;
    easy.write_function(|data| {
        stdout().write_all(data).unwrap();
        Ok(data.len())
    })?;
    easy.perform()?;
    Ok(())
}
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In this example, we're creating an Easy instance from the curl crate and setting the URL to https://www.example.com. We're then setting the request method to "OPTIONS" using the .custom_request() method.

We write the response data to stdout using the .write_function() method, and then perform the request using the .perform() method.