When I attempt to issue an HTTP Redirect from request_filter the connection hangs

## Describe the bug
I'm attempting to issue an HTTP redirect from `request_filter()`

With the code shown below the connection hangs.

There needs to be a way to issue something besides errors from the filters. Perhaps the docs are missing a working example, or perhaps this a feature request, I cannot tell.

## Pingora info

**Pingora version**: 0.3 (from crate)
**Rust version**: cargo 1.83.0 (5ffbef321 2024-10-29)
**Operating system version**: Docker for OSX, 20.10.17

## Steps to reproduce
Using example `Proxy HTTP for LB`, the following code for request_filter

```
use url::Url;
use pingora::proxy::{ProxyHttp, Session};
use pingora_http::{ResponseHeader, StatusCode};

async fn request_filter(&self, session: &mut Session, ctx: &mut Self::CTX) -> Result {
// Construct the redirect URL with the return_url parameter
let request = session.req_header();
let current_url = request.uri.to_string();
let scheme = request.uri.scheme_str().unwrap_or("http");
let host = request.uri.host().unwrap_or("localhost");
let port = session.req_header().uri.port_u16().unwrap_or(80);
let mut redirect_url = Url::parse(&format!("{}://{}:{}/redirect_test_path", scheme, host, port)).unwrap();
redirect_url.query_pairs_mut().append_pair("return_url", ¤t_url);

// Create the response with the Location header
let mut response = ResponseHeader::build(StatusCode::FOUND, None).unwrap();
response.insert_header("Location", redirect_url.as_str());

// Write the response header
session.write_response_header(Box::new(response), true).await?;
session.write_response_body(None, true).await?;
return Ok(true);
}
```

## Expected results
a `curl -v` should show the redirect and should exit.

## Observed results
```
$ curl -v --max-redirs 0 localhost:6190
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 6190 (#0)
> GET / HTTP/1.1
> Host: localhost:6190
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 302 Found
< Location: http://localhost/redirect_test_path?return_url=%2F
< Date: Sat, 28 Dec 2024 02:27:44 GMT
< Connection: keep-alive
* no chunk, no close, no size. Assume close to signal end
```

## Additional context