diff --git a/bin/oay/src/bin/webdav.rs b/bin/oay/src/bin/webdav.rs
index 3250dffcba79..acaf9161b5e7 100644
--- a/bin/oay/src/bin/webdav.rs
+++ b/bin/oay/src/bin/webdav.rs
@@ -18,11 +18,9 @@
 use std::sync::Arc;
 
 use anyhow::Result;
-
 use oay::services::WebdavService;
 use oay::Config;
 use opendal::services::Fs;
-
 use opendal::Operator;
 use tracing_subscriber::fmt;
 use tracing_subscriber::prelude::*;
diff --git a/bin/oay/src/services/webdav/service.rs b/bin/oay/src/services/webdav/service.rs
index dc3045f9683f..6a1bcf55269b 100644
--- a/bin/oay/src/services/webdav/service.rs
+++ b/bin/oay/src/services/webdav/service.rs
@@ -25,9 +25,8 @@ use axum::Router;
 use dav_server::DavHandler;
 use opendal::Operator;
 
-use crate::Config;
-
 use super::webdavfs::WebdavFs;
+use crate::Config;
 
 pub struct WebdavService {
     cfg: Arc<Config>,
diff --git a/bin/oay/src/services/webdav/webdav_file.rs b/bin/oay/src/services/webdav/webdav_file.rs
index ed9ac1ba6507..5128c246d990 100644
--- a/bin/oay/src/services/webdav/webdav_file.rs
+++ b/bin/oay/src/services/webdav/webdav_file.rs
@@ -17,10 +17,11 @@
 
 use std::io::SeekFrom;
 
-use dav_server::{
-    davpath::DavPath,
-    fs::{DavFile, DavMetaData, FsFuture, OpenOptions},
-};
+use dav_server::davpath::DavPath;
+use dav_server::fs::DavFile;
+use dav_server::fs::DavMetaData;
+use dav_server::fs::FsFuture;
+use dav_server::fs::OpenOptions;
 use futures::FutureExt;
 use opendal::Operator;
 
diff --git a/bin/oay/src/services/webdav/webdavfs.rs b/bin/oay/src/services/webdav/webdavfs.rs
index 7c5709aaff99..22f51df97506 100644
--- a/bin/oay/src/services/webdav/webdavfs.rs
+++ b/bin/oay/src/services/webdav/webdavfs.rs
@@ -15,11 +15,14 @@
 // specific language governing permissions and limitations
 // under the License.
 
-use dav_server::fs::{DavFile, DavFileSystem, DavMetaData};
+use dav_server::fs::DavFile;
+use dav_server::fs::DavFileSystem;
+use dav_server::fs::DavMetaData;
 use futures::FutureExt;
 use opendal::Operator;
 
-use super::{webdav_file::WebdavFile, webdav_metadata::WebdavMetaData};
+use super::webdav_file::WebdavFile;
+use super::webdav_metadata::WebdavMetaData;
 
 #[derive(Clone)]
 pub struct WebdavFs {
diff --git a/core/src/services/etcd/backend.rs b/core/src/services/etcd/backend.rs
index 035e9a58bd21..0181aeaa507a 100644
--- a/core/src/services/etcd/backend.rs
+++ b/core/src/services/etcd/backend.rs
@@ -21,10 +21,12 @@ use std::fmt::Formatter;
 
 use async_trait::async_trait;
 use etcd_client::Certificate;
+use etcd_client::Client;
+use etcd_client::ConnectOptions;
 use etcd_client::Error as EtcdError;
+use etcd_client::GetOptions;
 use etcd_client::Identity;
 use etcd_client::TlsOptions;
-use etcd_client::{Client, ConnectOptions, GetOptions};
 use tokio::sync::OnceCell;
 
 use crate::raw::adapters::kv;
diff --git a/core/src/services/obs/backend.rs b/core/src/services/obs/backend.rs
index cd7811abd957..aeb7b5bcdb4c 100644
--- a/core/src/services/obs/backend.rs
+++ b/core/src/services/obs/backend.rs
@@ -91,7 +91,7 @@ use crate::*;
 ///
 ///     Ok(())
 /// }
-///```
+/// ```
 
 const DEFAULT_WRITE_MIN_SIZE: usize = 100 * 1024;
 
diff --git a/core/src/services/s3/backend.rs b/core/src/services/s3/backend.rs
index 2a12a2b29ba0..8a2d46fc9095 100644
--- a/core/src/services/s3/backend.rs
+++ b/core/src/services/s3/backend.rs
@@ -556,17 +556,14 @@ impl S3Builder {
     /// use opendal::services::S3;
     ///
     /// # async fn example() {
-    /// let builder = S3::default();
-    /// let region: Option<String> = builder
-    ///     .detect_region("https://s3.amazonaws.com", "example")
-    ///     .await;
+    /// let region: Option<String> = S3::detect_region("https://s3.amazonaws.com", "example").await;
     /// # }
     /// ```
     ///
     /// # Reference
     ///
     /// - [Amazon S3 HeadBucket API](https://docs.aws.amazon.com/zh_cn/AmazonS3/latest/API/API_HeadBucket.html)
-    pub async fn detect_region(&self, endpoint: &str, bucket: &str) -> Option<String> {
+    pub async fn detect_region(endpoint: &str, bucket: &str) -> Option<String> {
         let mut endpoint = if endpoint.starts_with("http") {
             endpoint.to_string()
         } else {
@@ -626,19 +623,19 @@ impl S3Builder {
             res.headers()
         );
 
-        match res.status() {
-            StatusCode::OK | StatusCode::MOVED_PERMANENTLY => {
-                let region = res.headers().get("x-amz-bucket-region")?;
-                if let Ok(regin) = region.to_str() {
-                    Some(regin.to_string())
-                } else {
-                    None
-                }
-            }
-            StatusCode::FORBIDDEN => Some("us-east-1".to_string()),
-            // Unexpected status code
-            _ => None,
+        // Get region from response header no matter status code.
+        let region = res.headers().get("x-amz-bucket-region")?;
+        if let Ok(regin) = region.to_str() {
+            return Some(regin.to_string());
         }
+
+        // Status code is 403 or 200 means we already visit the correct
+        // region, we can use the default region directly.
+        if res.status() == StatusCode::FORBIDDEN || res.status() == StatusCode::OK {
+            return Some("us-east-1".to_string());
+        }
+
+        None
     }
 }
 
@@ -1249,10 +1246,8 @@ mod tests {
             ),
         ];
 
-        let b = S3Builder::default();
-
         for (name, endpoint, bucket, expected) in cases {
-            let region = b.detect_region(endpoint, bucket).await;
+            let region = S3Builder::detect_region(endpoint, bucket).await;
             assert_eq!(region.as_deref(), expected, "{}", name);
         }
     }