in src/main/java/software/amazon/msk/auth/iam/internals/AWS4SignedPayloadGenerator.java [70:80]
private DefaultRequest createRequestForSigning(AuthenticationRequestParams params) {
final DefaultRequest request = new DefaultRequest(params.getServiceScope());
request.setHttpMethod(HttpMethodName.GET);
try {
request.setEndpoint(new URI("kafka://" + params.getHost()));
} catch (URISyntaxException e) {
throw new IllegalArgumentException("Failed to parse host URI", e);
}
request.addParameter(ACTION_KEY, ACTION_VALUE);
return request;
}