It is deprecated, although won't go away for well over a year.
However the QR code generator inside it is old, and has likely not been updated or fixed in a while. It was the basis for the port in java, and we have fixed several things over the years in the Java version.
So for both reasons, it seems good to expose a similar API. Now the web app at zxing.org
has replicated as much as possible the API exposed by the chart server. For example:
In particular, one notable difference is that this generator will (correctly) insert an ECI segment for non-ISO-8859-1 encoding. This is correct but might trip up bad decoders.
Let me know if you try it and see any problems. Soon I will switch the zxing.appspot.com/generator
generator to use this for generation.