The HttpJson server streaming callable causes a NullPointerException (NPE) when processing responses containing Any type values. This is because the TypeRegistry in CallOptions is typically null, which is passed to ProtoMessageResponseParser.parse() within HttpJsonClientCallImpl, resulting in NPE.

For example, Spanner's BatchWriteResponse includes a Status field with an Any type details value. Consequently, when the server returns an error, the response parsing results in NPE.

Please take a look at a concrete example in googleapis/google-cloud-java#12247 for detailed reproduction steps.