in src/main/java/software/amazon/msk/auth/iam/internals/AWS4SignedPayloadGenerator.java [79:86]
private SdkHttpFullRequest createRequestForSigning(AuthenticationRequestParams params) {
return SdkHttpFullRequest.builder()
.method(SdkHttpMethod.GET)
.protocol(PROTOCOL)
.host(params.getHost())
.appendRawQueryParameter(ACTION_KEY, ACTION_VALUE)
.build();
}