diff --git a/codegen/protocol-test-codegen/build.gradle.kts b/codegen/protocol-test-codegen/build.gradle.kts
index 2da07cf2910..483f949a668 100644
--- a/codegen/protocol-test-codegen/build.gradle.kts
+++ b/codegen/protocol-test-codegen/build.gradle.kts
@@ -20,7 +20,7 @@ plugins {
 }
 
 dependencies {
-    implementation("software.amazon.smithy:smithy-aws-protocol-tests:[1.13.1,1.14.0[")
+    implementation("software.amazon.smithy:smithy-aws-protocol-tests:[1.14.0,1.15.0[")
     implementation(project(":smithy-aws-go-codegen"))
 }
 
diff --git a/codegen/smithy-aws-go-codegen/build.gradle.kts b/codegen/smithy-aws-go-codegen/build.gradle.kts
index 5160921f994..ac1631a8a7e 100644
--- a/codegen/smithy-aws-go-codegen/build.gradle.kts
+++ b/codegen/smithy-aws-go-codegen/build.gradle.kts
@@ -32,9 +32,9 @@ tasks.withType<Test> {
 }
 
 dependencies {
-    api("software.amazon.smithy:smithy-aws-traits:[1.13.1,2.0.0[")
-    api("software.amazon.smithy:smithy-aws-iam-traits:[1.13.1,2.0.0[")
-    api("software.amazon.smithy:smithy-aws-cloudformation-traits:[1.13.1,2.0.0[")
+    api("software.amazon.smithy:smithy-aws-traits:[1.14.0,2.0.0[")
+    api("software.amazon.smithy:smithy-aws-iam-traits:[1.14.0,2.0.0[")
+    api("software.amazon.smithy:smithy-aws-cloudformation-traits:[1.14.0,2.0.0[")
     api("software.amazon.smithy.go:smithy-go-codegen:0.1.0")
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.4.0")
     testImplementation("org.junit.jupiter:junit-jupiter-engine:5.4.0")
diff --git a/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/AwsProtocolUtils.java b/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/AwsProtocolUtils.java
index 8146f1e83c0..805e62ec05c 100644
--- a/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/AwsProtocolUtils.java
+++ b/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/AwsProtocolUtils.java
@@ -29,6 +29,7 @@
 import software.amazon.smithy.go.codegen.integration.HttpProtocolUnitTestResponseGenerator;
 import software.amazon.smithy.go.codegen.integration.IdempotencyTokenMiddlewareGenerator;
 import software.amazon.smithy.go.codegen.integration.ProtocolGenerator.GenerationContext;
+import software.amazon.smithy.model.shapes.Shape;
 import software.amazon.smithy.model.shapes.ShapeId;
 import software.amazon.smithy.utils.SetUtils;
 
@@ -207,6 +208,13 @@ static void generateHttpProtocolTests(GenerationContext context) {
                         .service(ShapeId.from("aws.protocoltests.json10#JsonRpc10"))
                         .operation(ShapeId.from("aws.protocoltests.json10#EmptyInputAndEmptyOutput"))
                         .addTestName("AwsJson10EmptyInputAndEmptyOutput")
+                        .build(),
+
+                // HTTP Payload Values that are unset vs set by the customer and how content-type should be handled.
+                HttpProtocolUnitTestGenerator.SkipTest.builder()
+                        .service(ShapeId.from("aws.protocoltests.restjson#RestJson"))
+                        .operation(ShapeId.from("aws.protocoltests.restjson#TestPayloadBlob"))
+                        .addTestName("RestJsonHttpWithEmptyBlobPayload")
                         .build()
         ));
 
diff --git a/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestJsonProtocolGenerator.java b/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestJsonProtocolGenerator.java
index b43ea7748eb..6aa2dfef183 100644
--- a/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestJsonProtocolGenerator.java
+++ b/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestJsonProtocolGenerator.java
@@ -47,6 +47,7 @@
 import software.amazon.smithy.model.shapes.ServiceShape;
 import software.amazon.smithy.model.shapes.Shape;
 import software.amazon.smithy.model.shapes.ShapeId;
+import software.amazon.smithy.model.shapes.ShapeType;
 import software.amazon.smithy.model.shapes.StructureShape;
 import software.amazon.smithy.model.shapes.UnionShape;
 import software.amazon.smithy.model.traits.EnumTrait;
@@ -107,8 +108,7 @@ protected void generateOperationDocumentSerializer(
     protected void writeMiddlewarePayloadAsDocumentSerializerDelegator(
             GenerationContext context,
             MemberShape memberShape,
-            String operand,
-            Consumer<GoWriter> setStream
+            String operand
     ) {
         GoWriter writer = context.getWriter().get();
         Model model = context.getModel();
@@ -123,6 +123,8 @@ protected void writeMiddlewarePayloadAsDocumentSerializerDelegator(
                     payloadShape, context.getService(), context.getProtocolName());
         }
 
+        writeSetPayloadShapeHeader(writer, payloadShape);
+
         GoValueAccessUtils.writeIfNonZeroValueMember(context.getModel(), context.getSymbolProvider(), writer,
                 memberShape, operand, (s) -> {
                     writer.addUseImports(SmithyGoDependency.SMITHY_JSON);
@@ -133,14 +135,14 @@ protected void writeMiddlewarePayloadAsDocumentSerializerDelegator(
                                      return out, metadata, &smithy.SerializationError{Err: err}
                                  }
                                  payload := bytes.NewReader(jsonEncoder.Bytes())""", functionName, s);
-                    setStream.accept(writer);
-                    if (payloadShape.isStructureShape()) {
+                    writeSetStream(writer, "payload");
+                    if (payloadShape.getType() == ShapeType.STRUCTURE) {
                         writer.openBlock("} else {", "", () -> {
                             writer.write("""
                                          jsonEncoder := smithyjson.NewEncoder()
                                          jsonEncoder.Value.Object().Close()
                                          payload := bytes.NewReader(jsonEncoder.Bytes())""");
-                            setStream.accept(writer);
+                            writeSetStream(writer, "payload");
                         });
                     }
                 });
diff --git a/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestXmlProtocolGenerator.java b/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestXmlProtocolGenerator.java
index 3abe8c3ba8b..a83fac819f3 100644
--- a/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestXmlProtocolGenerator.java
+++ b/codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/RestXmlProtocolGenerator.java
@@ -148,8 +148,7 @@ private void initalizeXmlEncoder(
     protected void writeMiddlewarePayloadAsDocumentSerializerDelegator(
             GenerationContext context,
             MemberShape memberShape,
-            String operand,
-            Consumer<GoWriter> setStream
+            String operand
     ) {
         GoWriter writer = context.getWriter().get();
         Model model = context.getModel();
@@ -157,6 +156,8 @@ protected void writeMiddlewarePayloadAsDocumentSerializerDelegator(
 
         GoValueAccessUtils.writeIfNonZeroValueMember(context.getModel(), context.getSymbolProvider(), writer,
                 memberShape, operand, (s) -> {
+                    writeSetPayloadShapeHeader(writer, payloadShape);
+
                     writer.addUseImports(SmithyGoDependency.SMITHY_XML);
                     writer.addUseImports(SmithyGoDependency.BYTES);
                     writer.write("xmlEncoder := smithyxml.NewEncoder(bytes.NewBuffer(nil))");
@@ -180,7 +181,7 @@ protected void writeMiddlewarePayloadAsDocumentSerializerDelegator(
                                 writer.write("return out, metadata, &smithy.SerializationError{Err: err}");
                             });
                     writer.write("payload := bytes.NewReader(xmlEncoder.Bytes())");
-                    setStream.accept(writer);
+                    writeSetStream(writer, "payload");
                 });
     }