diff --git a/src/main/java/org/gaul/s3proxy/AwsHttpHeaders.java b/src/main/java/org/gaul/s3proxy/AwsHttpHeaders.java
index 9f29882..de24087 100644
--- a/src/main/java/org/gaul/s3proxy/AwsHttpHeaders.java
+++ b/src/main/java/org/gaul/s3proxy/AwsHttpHeaders.java
@@ -21,6 +21,7 @@ final class AwsHttpHeaders {
     static final String API_VERSION = "x-amz-api-version";
     static final String CHECKSUM_ALGORITHM = "x-amz-checksum-algorithm";
     static final String CHECKSUM_CRC64NVME = "x-amz-checksum-crc64nvme";
+    static final String CHECKSUM_MODE = "x-amz-checksum-mode";
     static final String CONTENT_SHA256 = "x-amz-content-sha256";
     static final String COPY_SOURCE = "x-amz-copy-source";
     static final String COPY_SOURCE_IF_MATCH = "x-amz-copy-source-if-match";
diff --git a/src/main/java/org/gaul/s3proxy/S3ProxyHandler.java b/src/main/java/org/gaul/s3proxy/S3ProxyHandler.java
index 455ab0c..7df3eed 100644
--- a/src/main/java/org/gaul/s3proxy/S3ProxyHandler.java
+++ b/src/main/java/org/gaul/s3proxy/S3ProxyHandler.java
@@ -165,6 +165,7 @@ public class S3ProxyHandler {
             AwsHttpHeaders.API_VERSION,
             AwsHttpHeaders.CHECKSUM_ALGORITHM,  // TODO: ignoring header
             AwsHttpHeaders.CHECKSUM_CRC64NVME,  // TODO: ignoring header
+            AwsHttpHeaders.CHECKSUM_MODE,  // TODO: ignoring header
             AwsHttpHeaders.CONTENT_SHA256,
             AwsHttpHeaders.COPY_SOURCE,
             AwsHttpHeaders.COPY_SOURCE_IF_MATCH,
@@ -177,7 +178,7 @@ public class S3ProxyHandler {
             AwsHttpHeaders.METADATA_DIRECTIVE,
             AwsHttpHeaders.SDK_CHECKSUM_ALGORITHM,  // TODO: ignoring header
             AwsHttpHeaders.STORAGE_CLASS,
-            AwsHttpHeaders.TRAILER,  // TODO: ignoring header
+            AwsHttpHeaders.TRAILER,
             AwsHttpHeaders.TRANSFER_ENCODING,  // TODO: ignoring header
             AwsHttpHeaders.USER_AGENT
     );