would like support for freeform request bodies

[jclulow]

I have an API where I am just accepting a freeform string in a POST. I was able to read a capped amount of bytes, thus:

use hyper::body::HttpBody;

async fn read_body(rqctx: &Arc<RequestContext>, max: usize) -> Result<String> {
    let mut req = rqctx.request.lock().await;
    let body = req.body_mut();
    let mut out: Vec<u8> = Vec::new();

    while let Some(x) = body.data().await.transpose()
        .map_err(|e| anyhow!("body read: {}", e))?
    {
        if out.len().saturating_add(x.len()) > max {
            bail!("request size exceeded {} bytes", max);
        }

        out.append(&mut x.to_vec());
    }

    Ok(String::from_utf8(out)?)
}

It'd be neat if there was some way to get either a UTF-8 String or a slice or vector of u8 (I think both will be useful at different times) through an extractor in the way that you can get a specific Deserializable today.