Updates

Author: dagnir

core/http-auth-aws/src/main/java/software/amazon/awssdk/http/auth/aws/internal/signer/DefaultAwsV4HttpSigner.java

@@ -187,7 +187,7 @@ private static V4PayloadSigner v4PayloadAsyncSigner(
         AsyncSignRequest<? extends AwsCredentialsIdentity> request,
         V4Properties properties) {
 
-        boolean isPayloadSigning = !asyncShouldTreatAsUnsigned(request);
+        boolean isPayloadSigning = isPayloadSigning(request);
         boolean isEventStreaming = isEventStreaming(request.request());
         boolean isChunkEncoding = request.requireProperty(CHUNK_ENCODING_ENABLED, false);
         boolean isTrailing = request.request().firstMatchingHeader(X_AMZ_TRAILER).isPresent();
@@ -204,6 +204,13 @@ private static V4PayloadSigner v4PayloadAsyncSigner(
             throw new UnsupportedOperationException("Unsigned payload is not supported with event-streaming.");
         }
 
+        // Note: this check is done after we check if the request is eventstreaming, during which we just use the normal logic
+        // as sync to determine if the body should be signed. If it's not eventstreaming, hen async needs to treat this request
+        // as unsigned to maintain current behavior re: plain HTTP requests.
+        if (asyncShouldTreatAsUnsigned(request)) {
+            isPayloadSigning = false;
+        }
+
         if (useChunkEncoding(isPayloadSigning, isChunkEncoding, isTrailing || isFlexible)) {
             return AwsChunkedV4PayloadSigner.builder()
                                             .credentialScope(properties.getCredentialScope())