No auth possible through squid proxy

[swirly]

Hello

Using squid proxy (ok, old 2.7 version) in a school to connect to the net. Account creation or login is not possible.

When having the signup page (https://id.webmaker.org/signup), I can fill the fields, but on clicking on signup, nothing happens

Using the console, I can find this error :
flags argument of String.prototype.{search,match,replace} is deprecated

The post of the request is correct.

But the response is an error

And in the network status, there is a 400 return code for the create-user

---

statusCode400
error"Bad Request"
message"invalid payload: client_id"

---

The problem only appear when using squid

I've tried with or without http11 flag on on squid

Of course, signup and auth works perfectly without squid.

Maybe it's a squid problem (surely) but is it normal ?

TIA