fix: parquet over http

[universalmind303]

reqwest's content_length method apparantly doesnt check for the casing of "Content-Length". This seems like a bug in reqwest to me.

seanmonstar/reqwest#843

#[tokio::main]
async fn main() {
    let client = reqwest::Client::new();
    let head_res = client.head("https://clickhouse-public-datasets.s3.eu-central-1.amazonaws.com/hits_compatible/athena/hits.parquet").send().await.unwrap();
    let content_length = head_res.content_length();
    assert_eq!(content_length, Some(14779976446))
}

closes #2561

[tychoish]

regression testable?

[universalmind303]

regression testable?

maybe?? Without relying on other apis like the one mentioned in the issue, We'd have to spin up some infra for hosting some public files.