UnicodeDecodeError when creating Kinesis stream through Java SDK

Running the moto server through Docker: ```bash docker run --rm -p 5000:5000 --name moto motoserver/moto:latest ``` And then attempting to create a Kinesis stream with the Java SDK (below is Scala code): ```scala import java.net.URI import software.amazon.awssdk.services.kinesis.KinesisClient import software.amazon.awssdk.services.kinesis.model.CreateStreamRequest KinesisClient.builder() .endpointOverride(URI.create("http://localhost:5000")) .build() .createStream(CreateStreamRequest.builder().streamName("test").build()) ``` Results in an error in the Docker container logs: ``` Error on request: Traceback (most recent call last): File "/usr/local/lib/python3.13/site-packages/werkzeug/serving.py", line 370, in run_wsgi execute(self.server.app) ~~~~~~~^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/werkzeug/serving.py", line 331, in execute application_iter = app(environ, start_response) File "/moto/moto/moto_server/werkzeug_app.py", line 268, in __call__ return backend_app(environ, start_response) File "/usr/local/lib/python3.13/site-packages/flask/app.py", line 1536, in __call__ return self.wsgi_app(environ, start_response) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/flask/app.py", line 1514, in wsgi_app response = self.handle_exception(e) File "/usr/local/lib/python3.13/site-packages/flask_cors/extension.py", line 176, in wrapped_function return cors_after_request(app.make_response(f(*args, **kwargs))) ~^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/flask/app.py", line 1511, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python3.13/site-packages/flask/app.py", line 919, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python3.13/site-packages/flask_cors/extension.py", line 176, in wrapped_function return cors_after_request(app.make_response(f(*args, **kwargs))) ~^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/flask/app.py", line 917, in full_dispatch_request rv = self.dispatch_request() File "/usr/local/lib/python3.13/site-packages/flask/app.py", line 902, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^ File "/moto/moto/core/utils.py", line 123, in __call__ result = self.callback(request, request.url, dict(request.headers)) File "/moto/moto/core/responses.py", line 283, in dispatch return cls()._dispatch(*args, **kwargs) ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^ File "/moto/moto/core/responses.py", line 458, in _dispatch self.setup_class(request, full_url, headers) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/moto/moto/core/responses.py", line 344, in setup_class self.body = self.body.decode("utf-8") ~~~~~~~~~~~~~~~~^^^^^^^^^ UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbf in position 0: invalid start byte ```