diff --git a/rustfs/src/admin/handlers.rs b/rustfs/src/admin/handlers.rs
index 45cae3e3..bcba70e8 100644
--- a/rustfs/src/admin/handlers.rs
+++ b/rustfs/src/admin/handlers.rs
@@ -27,6 +27,7 @@ use iam::{auth, get_global_action_cred};
 use madmin::metrics::RealtimeMetrics;
 use madmin::utils::parse_duration;
 use matchit::Params;
+use s3s::header::CONTENT_TYPE;
 use s3s::stream::{ByteStream, DynByteStream};
 use s3s::{
     dto::{AssumeRoleOutput, Credentials, Timestamp},
@@ -354,10 +355,13 @@ impl Operation for AccountInfoHandler {
             policy: bucket_policy,
         };
 
-        let output = serde_json::to_string(&info)
+        let data = serde_json::to_vec(&info)
             .map_err(|_e| S3Error::with_message(S3ErrorCode::InternalError, "parse accountInfo failed"))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(output))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
@@ -380,10 +384,13 @@ impl Operation for ServerInfoHandler {
 
         let info = get_server_info(true).await;
 
-        let output = serde_json::to_string(&info)
+        let data = serde_json::to_vec(&info)
             .map_err(|_e| S3Error::with_message(S3ErrorCode::InternalError, "parse serverInfo failed"))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(output))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
@@ -413,10 +420,13 @@ impl Operation for StorageInfoHandler {
 
         let info = store.storage_info().await;
 
-        let output = serde_json::to_string(&info)
+        let data = serde_json::to_vec(&info)
             .map_err(|_e| S3Error::with_message(S3ErrorCode::InternalError, "parse accountInfo failed"))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(output))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
@@ -436,10 +446,13 @@ impl Operation for DataUsageInfoHandler {
             s3_error!(InternalError, "load_data_usage_from_backend failed")
         })?;
 
-        let output = serde_json::to_string(&info)
+        let data = serde_json::to_vec(&info)
             .map_err(|_e| S3Error::with_message(S3ErrorCode::InternalError, "parse DataUsageInfo failed"))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(output))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
@@ -860,10 +873,13 @@ impl Operation for ListPools {
             pools_status.push(state);
         }
 
-        let output = serde_json::to_string(&pools_status)
+        let data = serde_json::to_vec(&pools_status)
             .map_err(|_e| S3Error::with_message(S3ErrorCode::InternalError, "parse accountInfo failed"))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(output))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
@@ -927,10 +943,13 @@ impl Operation for StatusPool {
 
         let pools_status = store.status(idx).await.map_err(to_s3_error)?;
 
-        let output = serde_json::to_string(&pools_status)
+        let data = serde_json::to_vec(&pools_status)
             .map_err(|_e| S3Error::with_message(S3ErrorCode::InternalError, "parse accountInfo failed"))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(output))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
diff --git a/rustfs/src/admin/handlers/group.rs b/rustfs/src/admin/handlers/group.rs
index 53d6fbeb..dee5c515 100644
--- a/rustfs/src/admin/handlers/group.rs
+++ b/rustfs/src/admin/handlers/group.rs
@@ -1,5 +1,5 @@
 use http::StatusCode;
-use iam::{error::is_err_no_such_user, get_global_action_cred, Error};
+use iam::{error::is_err_no_such_user, get_global_action_cred};
 use madmin::GroupAddRemove;
 use matchit::Params;
 use s3s::{s3_error, Body, S3Error, S3ErrorCode, S3Request, S3Response, S3Result};
diff --git a/rustfs/src/admin/handlers/service_account.rs b/rustfs/src/admin/handlers/service_account.rs
index 6d1c89b3..3b86474f 100644
--- a/rustfs/src/admin/handlers/service_account.rs
+++ b/rustfs/src/admin/handlers/service_account.rs
@@ -1,5 +1,6 @@
 use std::collections::HashMap;
 
+use http::HeaderMap;
 use hyper::StatusCode;
 use iam::{
     auth::CredentialsBuilder,
@@ -10,7 +11,7 @@ use iam::{
 };
 use madmin::{AddServiceAccountReq, ListServiceAccountsResp, ServiceAccountInfo};
 use matchit::Params;
-use s3s::{s3_error, Body, S3Error, S3ErrorCode, S3Request, S3Response, S3Result};
+use s3s::{header::CONTENT_TYPE, s3_error, Body, S3Error, S3ErrorCode, S3Request, S3Response, S3Result};
 use serde_urlencoded::from_bytes;
 use tracing::{debug, warn};
 
@@ -277,7 +278,10 @@ impl Operation for ListServiceAccount {
         let data = serde_json::to_vec(&ListServiceAccountsResp { accounts })
             .map_err(|e| S3Error::with_message(S3ErrorCode::InternalError, format!("marshal users err {}", e)))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(data))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
diff --git a/rustfs/src/admin/handlers/user.rs b/rustfs/src/admin/handlers/user.rs
index f60b8531..7f7afdf0 100644
--- a/rustfs/src/admin/handlers/user.rs
+++ b/rustfs/src/admin/handlers/user.rs
@@ -1,8 +1,8 @@
-use http::StatusCode;
+use http::{HeaderMap, StatusCode};
 use iam::get_global_action_cred;
 use madmin::{AccountStatus, AddOrUpdateUserReq};
 use matchit::Params;
-use s3s::{s3_error, Body, S3Error, S3ErrorCode, S3Request, S3Response, S3Result};
+use s3s::{header::CONTENT_TYPE, s3_error, Body, S3Error, S3ErrorCode, S3Request, S3Response, S3Result};
 use serde::Deserialize;
 use serde_urlencoded::from_bytes;
 use tracing::warn;
@@ -87,7 +87,10 @@ impl Operation for AddUser {
             .await
             .map_err(|e| S3Error::with_message(S3ErrorCode::InternalError, format!("create_user err {}", e)))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::empty())))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::empty()), header))
     }
 }
 
@@ -128,7 +131,10 @@ impl Operation for SetUserStatus {
             .await
             .map_err(|e| S3Error::with_message(S3ErrorCode::InternalError, format!("set_user_status err {}", e)))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::empty())))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::empty()), header))
     }
 }
 
@@ -151,7 +157,10 @@ impl Operation for ListUsers {
         // let body = encrypt_data(input_cred.secret_key.expose().as_bytes(), &data)
         //     .map_err(|e| S3Error::with_message(S3ErrorCode::InvalidArgument, format!("encrypt_data err {}", e)))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(data))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }
 
@@ -188,7 +197,10 @@ impl Operation for RemoveUser {
             .await
             .map_err(|e| S3Error::with_message(S3ErrorCode::InternalError, format!("delete_user err {}", e)))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::empty())))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::empty()), header))
     }
 }
 
@@ -220,6 +232,9 @@ impl Operation for GetUserInfo {
         let data = serde_json::to_vec(&info)
             .map_err(|e| S3Error::with_message(S3ErrorCode::InternalError, format!("marshal user err {}", e)))?;
 
-        Ok(S3Response::new((StatusCode::OK, Body::from(data))))
+        let mut header = HeaderMap::new();
+        header.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+
+        Ok(S3Response::with_headers((StatusCode::OK, Body::from(data)), header))
     }
 }