HTTPS Callable functions and headers

[Laurent Pellegrino]

Hi there,

HTTPS Callable functions are really convenient. However, I cannot find a way to access headers from the server when functions.https.onCall is executed.

My purpose is to get the user IP and detect it's browser language.

Is there a solution?

Kind Regards,

Laurent Pellegrino

[Bryan Klimt]

Hi Laurent,

Currently, there is no way to access the raw headers inside a functions.https.onCall handler. Probably the two easiest workarounds would be either to 1) use an https.onRequest handler and parse the request yourself, or 2) put the browser language into the params passed to the function from within your client.

-Bryan

https://firebase.google.com/docs/functions/callable-reference 

[Laurent Pellegrino]

Hi Bryan,

Thanks for your answer. 

The second solution requires a previous request to know the IP or browser language values to pass to the function.

The first solution is obvious but the purpose was to use a callable to avoid validating auth tokens and deserializing the request body by myself.

It's a shame to have headers completely hidden from the HTTPS Callable API. Information is there, we could avoid boilerplate code and prevent useless requests but no, we can't access it :(

Kind Regards,

Laurent Pellegrino