How to support HTTP 103 Early Hints?

hi,

WIth Chrome 103, the HTTP 103 Early Hints is in release build. But how to support this in expressjs? Thanks!!

https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103 https://developer.chrome.com/blog/new-in-chrome-103/

[dougwilson]

No, it’s not a wrapper, it is inheritance. Anything on the Node.js response is on the Express.js response, because it’s just class inheritance. The Express.js response is just a subclass of the Node.js response. You’ll notice you can call res.writeProcessing() and res.writeContinue() in your Express.js middleware, yet you won’t find those anywhere in the Express.js source code, since nothing needs to be done to add methods from the Node.js classes to the Express.js ones. I hope that helps.

[fishcharlie]

@dougwilson Thanks so much for the reply.

Everything (minus one part) you said makes sense and I agree with all of it.

Once that PR lands in Node.js, the API is automatically available in Express.js when used with that Node.js version

This is the part I’m slightly confused about. I was under the impression that Express.js was basically a wrapper around the Node.js HTTP package. Therefore, wouldn’t the wrapper need to be updated to support that new method?

Methods such as res.set don’t exist within the native HTTP package (I assume it gets mapped to response.setHeader).

So shouldn’t Express.js (at some point) add a new method for the writeEarlyHints method that was added in that PR? Similar to how res.set maps to response.setHeader. Something like res.earlyHints that gets mapped to response.writeEarlyHints?