feat: add stream pipe response

[stafyniaksacha]

This allows to pipe readable streams returned from middlewares!

I also set the default content-type header used for buffers and streams to text/html assuming most of time it would be used to pipe html response. We could use application/octet-stream instead, but it would require to explicitly set content-type on each responses.

[danielroe]

Very nice thought. However, it looks like this adds a hard dependency on node, which we would want to avoid. Maybe something other than instanceof as a test?

[stafyniaksacha]

Very nice thought. However, it looks like this adds a hard dependency on node, which we would want to avoid. Maybe something other than instanceof as a test?

Hum, that's true. Using deno or web workers would rely on ReadableStream which is the new standard.

This uses the former node streams. Instead we can rely on the new stream implementation, so we can check over pipeTo method instead of instanceof.

The caveat is that the feature is new and require node v16, what do you think?

Edit: unfortunately we can not use pipeTo on http responses for now, even with node 17