diff --git a/private/aws-restjson-server/src/protocols/Aws_restJson1.ts b/private/aws-restjson-server/src/protocols/Aws_restJson1.ts
index ce079df7d7d9..8ed51a46fbbc 100644
--- a/private/aws-restjson-server/src/protocols/Aws_restJson1.ts
+++ b/private/aws-restjson-server/src/protocols/Aws_restJson1.ts
@@ -382,7 +382,7 @@ export const deserializeAllQueryStringTypesRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -614,7 +614,7 @@ export const deserializeConstantAndVariableQueryStringRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -668,7 +668,7 @@ export const deserializeConstantQueryStringRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -838,7 +838,7 @@ export const deserializeEmptyInputAndEmptyOutputRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1146,7 +1146,7 @@ export const deserializeHttpPrefixHeadersRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1182,7 +1182,7 @@ export const deserializeHttpPrefixHeadersInResponseRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1207,7 +1207,7 @@ export const deserializeHttpRequestWithFloatLabelsRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1238,7 +1238,7 @@ export const deserializeHttpRequestWithGreedyLabelInPathRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1269,7 +1269,7 @@ export const deserializeHttpRequestWithLabelsRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1308,7 +1308,7 @@ export const deserializeHttpRequestWithLabelsAndTimestampFormatRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1360,7 +1360,7 @@ export const deserializeHttpRequestWithRegexLiteralRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -1466,7 +1466,7 @@ export const deserializeInputAndOutputWithHeadersRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2053,7 +2053,7 @@ export const deserializeMalformedContentTypeWithoutBodyEmptyInputRequest = async
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2454,7 +2454,7 @@ export const deserializeMalformedStringRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2571,7 +2571,7 @@ export const deserializeMalformedTimestampHeaderDateTimeRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2598,7 +2598,7 @@ export const deserializeMalformedTimestampHeaderDefaultRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2625,7 +2625,7 @@ export const deserializeMalformedTimestampHeaderEpochRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2652,7 +2652,7 @@ export const deserializeMalformedTimestampPathDefaultRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2682,7 +2682,7 @@ export const deserializeMalformedTimestampPathEpochRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2712,7 +2712,7 @@ export const deserializeMalformedTimestampPathHttpDateRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2742,7 +2742,7 @@ export const deserializeMalformedTimestampQueryDefaultRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2783,7 +2783,7 @@ export const deserializeMalformedTimestampQueryEpochRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2824,7 +2824,7 @@ export const deserializeMalformedTimestampQueryHttpDateRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2894,7 +2894,7 @@ export const deserializeMediaTypeHeaderRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -2974,7 +2974,7 @@ export const deserializeNullAndEmptyHeadersClientRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3006,7 +3006,7 @@ export const deserializeNullAndEmptyHeadersServerRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3038,7 +3038,7 @@ export const deserializeOmitsNullSerializesEmptyStringRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3092,7 +3092,7 @@ export const deserializeOmitsSerializingEmptyListsRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3312,7 +3312,7 @@ export const deserializeQueryIdempotencyTokenAutoFillRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3353,7 +3353,7 @@ export const deserializeQueryParamsAsStringListMapRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3401,7 +3401,7 @@ export const deserializeQueryPrecedenceRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3486,7 +3486,7 @@ export const deserializeResponseCodeHttpFallbackRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3753,7 +3753,7 @@ export const deserializeTestGetNoPayloadRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3845,7 +3845,7 @@ export const deserializeTestPostNoPayloadRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
@@ -3872,7 +3872,7 @@ export const deserializeTimestampFormatHeadersRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }
diff --git a/private/aws-restjson-validation-server/src/protocols/Aws_restJson1.ts b/private/aws-restjson-validation-server/src/protocols/Aws_restJson1.ts
index f01881d1eab3..d12999f16ac2 100644
--- a/private/aws-restjson-validation-server/src/protocols/Aws_restJson1.ts
+++ b/private/aws-restjson-validation-server/src/protocols/Aws_restJson1.ts
@@ -201,7 +201,7 @@ export const deserializeMalformedLengthQueryStringRequest = async (
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }