diff --git a/weed/credential/grpc/grpc_store.go b/weed/credential/grpc/grpc_store.go
index 944a09c13..520a94e43 100644
--- a/weed/credential/grpc/grpc_store.go
+++ b/weed/credential/grpc/grpc_store.go
@@ -94,7 +94,7 @@ func (store *IamGrpcStore) withIamClient(ctx context.Context, fn func(ctx contex
 	if len(signingKey) > 0 {
 		token := security.GenJwtForFilerAdmin(signingKey, expiresAfterSec)
 		if token != "" {
-			ctx = metadata.AppendToOutgoingContext(ctx, "authorization", "Bearer "+string(token))
+			ctx = metadata.AppendToOutgoingContext(ctx, "authorization", security.BearerPrefix+string(token))
 		}
 	}
 
diff --git a/weed/iam/oidc/oidc_provider.go b/weed/iam/oidc/oidc_provider.go
index d85ef065e..b5c3c1969 100644
--- a/weed/iam/oidc/oidc_provider.go
+++ b/weed/iam/oidc/oidc_provider.go
@@ -24,6 +24,7 @@ import (
 	"github.com/golang-jwt/jwt/v5"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/iam/providers"
+	"github.com/seaweedfs/seaweedfs/weed/security"
 )
 
 // OIDCProvider implements OpenID Connect authentication
@@ -595,7 +596,7 @@ func (p *OIDCProvider) getUserInfoWithToken(ctx context.Context, userID, accessT
 
 	// Set authorization header if access token is provided
 	if accessToken != "" {
-		req.Header.Set("Authorization", "Bearer "+accessToken)
+		req.Header.Set("Authorization", security.BearerPrefix+accessToken)
 	}
 	req.Header.Set("Accept", "application/json")
 
diff --git a/weed/mount/weedfs_file_copy_range.go b/weed/mount/weedfs_file_copy_range.go
index 1c9bdfb2d..da5fd7f50 100644
--- a/weed/mount/weedfs_file_copy_range.go
+++ b/weed/mount/weedfs_file_copy_range.go
@@ -427,7 +427,7 @@ func (wfs *WFS) copyEntryViaFiler(cancel <-chan struct{}, copyRequest wholeFileS
 		return nil, serverSideWholeFileCopyNotCommitted, fmt.Errorf("create filer copy request: %w", err)
 	}
 	if jwt := wfs.filerCopyJWT(); jwt != "" {
-		req.Header.Set("Authorization", "Bearer "+string(jwt))
+		req.Header.Set("Authorization", security.BearerPrefix+string(jwt))
 	}
 
 	resp, err := httpClient.Do(req)
@@ -504,4 +504,3 @@ func (wfs *WFS) filerCopyJWT() security.EncodedJwt {
 	}
 	return security.GenJwtForFilerServer(wfs.option.FilerSigningKey, wfs.option.FilerSigningExpiresAfterSec)
 }
-
diff --git a/weed/notification/webhook/http.go b/weed/notification/webhook/http.go
index 82a8f8e71..4a044ae12 100644
--- a/weed/notification/webhook/http.go
+++ b/weed/notification/webhook/http.go
@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/security"
 	util_http "github.com/seaweedfs/seaweedfs/weed/util/http"
 )
 
@@ -84,7 +85,7 @@ func (h *httpClient) sendMessageWithRetry(message *webhookMessage, depth int) er
 
 	req.Header.Set("Content-Type", "application/json")
 	if h.token != "" {
-		req.Header.Set("Authorization", "Bearer "+h.token)
+		req.Header.Set("Authorization", security.BearerPrefix+h.token)
 	}
 
 	// Apply timeout via context (not on client) to avoid redundancy
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index 99a8a57d6..493d1c2c9 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -458,7 +458,7 @@ func (uploader *Uploader) upload_content(ctx context.Context, fillBufferFunction
 		req.Header.Set(k, v)
 	}
 	if option.Jwt != "" {
-		req.Header.Set("Authorization", "BEARER "+string(option.Jwt))
+		req.Header.Set("Authorization", security.BearerPrefix+string(option.Jwt))
 	}
 
 	request_id.InjectToRequest(ctx, req)
diff --git a/weed/s3api/s3_iam_middleware.go b/weed/s3api/s3_iam_middleware.go
index 90caa3b4c..84de97f44 100644
--- a/weed/s3api/s3_iam_middleware.go
+++ b/weed/s3api/s3_iam_middleware.go
@@ -14,6 +14,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/iam/providers"
 	"github.com/seaweedfs/seaweedfs/weed/iam/sts"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
+	"github.com/seaweedfs/seaweedfs/weed/security"
 )
 
 // privateNetworks contains pre-parsed private IP ranges for efficient lookups
@@ -87,11 +88,11 @@ func (s3iam *S3IAMIntegration) AuthenticateJWT(ctx context.Context, r *http.Requ
 
 	// Extract bearer token from Authorization header
 	authHeader := r.Header.Get("Authorization")
-	if !strings.HasPrefix(authHeader, "Bearer ") {
+	if !strings.HasPrefix(authHeader, security.BearerPrefix) {
 		return nil, s3err.ErrAccessDenied
 	}
 
-	sessionToken := strings.TrimPrefix(authHeader, "Bearer ")
+	sessionToken := strings.TrimPrefix(authHeader, security.BearerPrefix)
 	if sessionToken == "" {
 		return nil, s3err.ErrAccessDenied
 	}
diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index ffd9a4b40..5730cb920 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -21,6 +21,7 @@ import (
 
 	"github.com/seaweedfs/seaweedfs/weed/filer"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
+	"github.com/seaweedfs/seaweedfs/weed/security"
 
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
@@ -1830,7 +1831,7 @@ func (s3a *S3ApiServer) fetchFullChunk(ctx context.Context, fileId string) (io.R
 
 	// Set JWT for authentication
 	if jwt != "" {
-		req.Header.Set("Authorization", "BEARER "+jwt)
+		req.Header.Set("Authorization", security.BearerPrefix+jwt)
 	}
 
 	// Use shared HTTP client
@@ -1877,7 +1878,7 @@ func (s3a *S3ApiServer) fetchChunkViewData(ctx context.Context, chunkView *filer
 
 	// Set JWT for authentication
 	if jwt != "" {
-		req.Header.Set("Authorization", "BEARER "+jwt)
+		req.Header.Set("Authorization", security.BearerPrefix+jwt)
 	}
 
 	// Use shared HTTP client with connection pooling
@@ -2940,7 +2941,7 @@ func (s3a *S3ApiServer) createEncryptedChunkReader(ctx context.Context, chunk *f
 	// Attach volume server JWT for authentication (uses config loaded once at startup)
 	jwt := filer.JwtForVolumeServer(chunk.GetFileIdString())
 	if jwt != "" {
-		req.Header.Set("Authorization", "BEARER "+jwt)
+		req.Header.Set("Authorization", security.BearerPrefix+jwt)
 	}
 
 	// Use shared HTTP client with connection pooling
diff --git a/weed/s3api/s3api_object_handlers_copy.go b/weed/s3api/s3api_object_handlers_copy.go
index d76f0a95c..3da0370de 100644
--- a/weed/s3api/s3api_object_handlers_copy.go
+++ b/weed/s3api/s3api_object_handlers_copy.go
@@ -1635,7 +1635,7 @@ func (s3a *S3ApiServer) downloadChunkData(srcUrl, fileId string, offset, size in
 		req, err := http.NewRequest(http.MethodHead, srcUrl, nil)
 		if err == nil {
 			if jwt != "" {
-				req.Header.Set("Authorization", "BEARER "+string(jwt))
+				req.Header.Set("Authorization", security.BearerPrefix+string(jwt))
 			}
 			resp, err := util_http.GetGlobalHttpClient().Do(req)
 			if err == nil {
diff --git a/weed/s3api/s3api_object_handlers_copy_stream.go b/weed/s3api/s3api_object_handlers_copy_stream.go
index 98ea6da7f..a25a631c8 100644
--- a/weed/s3api/s3api_object_handlers_copy_stream.go
+++ b/weed/s3api/s3api_object_handlers_copy_stream.go
@@ -106,7 +106,7 @@ func (s3a *S3ApiServer) streamCopyChunkRange(
 		return fmt.Errorf("create source GET: %w", err)
 	}
 	if srcJwt != "" {
-		srcReq.Header.Set("Authorization", "BEARER "+srcJwt)
+		srcReq.Header.Set("Authorization", security.BearerPrefix+srcJwt)
 	}
 	if isFullChunk {
 		// Manually setting Accept-Encoding tells Go's http.Transport that
@@ -188,7 +188,7 @@ func (s3a *S3ApiServer) streamCopyChunkRange(
 	}
 	req.Header.Set("Content-Type", contentType)
 	if dstJwt != "" {
-		req.Header.Set("Authorization", "BEARER "+string(dstJwt))
+		req.Header.Set("Authorization", security.BearerPrefix+string(dstJwt))
 	}
 
 	resp, err := util_http.GetGlobalHttpClient().Do(req)
diff --git a/weed/security/jwt.go b/weed/security/jwt.go
index 85b5163f9..22fbacf54 100644
--- a/weed/security/jwt.go
+++ b/weed/security/jwt.go
@@ -13,6 +13,11 @@ import (
 type EncodedJwt string
 type SigningKey []byte
 
+// BearerPrefix is the RFC 6750 Authorization header scheme prefix for bearer
+// tokens. Used when constructing "Authorization: Bearer <token>" headers; the
+// scheme name itself is matched case-insensitively when parsing (see GetJwt).
+const BearerPrefix = "Bearer "
+
 // SeaweedFileIdClaims is created by Master server(s) and consumed by Volume server(s),
 // restricting the access this JWT allows to only a single file.
 type SeaweedFileIdClaims struct {
diff --git a/weed/server/filer_server_handlers_copy.go b/weed/server/filer_server_handlers_copy.go
index 041c19d89..35a5d1108 100644
--- a/weed/server/filer_server_handlers_copy.go
+++ b/weed/server/filer_server_handlers_copy.go
@@ -18,6 +18,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/operation"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
+	"github.com/seaweedfs/seaweedfs/weed/security"
 	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
@@ -669,7 +670,7 @@ func (fs *FilerServer) uploadData(ctx context.Context, reader io.Reader, urlLoca
 	}
 
 	if auth != "" {
-		req.Header.Set("Authorization", "Bearer "+auth)
+		req.Header.Set("Authorization", security.BearerPrefix+auth)
 	}
 
 	resp, err := client.Do(req)
@@ -795,7 +796,7 @@ func (fs *FilerServer) performStreamCopy(ctx context.Context, srcUrl, dstUrl, au
 
 	// Set authorization header if provided
 	if auth != "" {
-		dstReq.Header.Set("Authorization", "Bearer "+auth)
+		dstReq.Header.Set("Authorization", security.BearerPrefix+auth)
 	}
 	dstReq.Header.Set("Content-Type", "application/octet-stream")
 
diff --git a/weed/server/filer_server_handlers_proxy.go b/weed/server/filer_server_handlers_proxy.go
index 5126d421a..e06c5f5a9 100644
--- a/weed/server/filer_server_handlers_proxy.go
+++ b/weed/server/filer_server_handlers_proxy.go
@@ -5,6 +5,7 @@ import (
 	"sync"
 
 	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/security"
 	util_http "github.com/seaweedfs/seaweedfs/weed/util/http"
 	"github.com/seaweedfs/seaweedfs/weed/util/mem"
 	"github.com/seaweedfs/seaweedfs/weed/util/request_id"
@@ -99,7 +100,7 @@ func (fs *FilerServer) proxyToVolumeServer(w http.ResponseWriter, r *http.Reques
 
 	// volume server may require a read JWT even though the proxy endpoint doesn't
 	if jwt := fs.maybeGetVolumeReadJwtAuthorizationToken(fileId); jwt != "" {
-		proxyReq.Header.Set("Authorization", "BEARER "+jwt)
+		proxyReq.Header.Set("Authorization", security.BearerPrefix+jwt)
 	}
 
 	proxyResponse, postErr := util_http.GetGlobalHttpClient().Do(proxyReq)
diff --git a/weed/server/master_server_handlers.go b/weed/server/master_server_handlers.go
index 731052601..102eb6669 100644
--- a/weed/server/master_server_handlers.go
+++ b/weed/server/master_server_handlers.go
@@ -221,5 +221,5 @@ func (ms *MasterServer) maybeAddJwtAuthorization(w http.ResponseWriter, fileId s
 		return
 	}
 
-	w.Header().Set("Authorization", "BEARER "+string(encodedJwt))
+	w.Header().Set("Authorization", security.BearerPrefix+string(encodedJwt))
 }
diff --git a/weed/sftpd/sftp_filer.go b/weed/sftpd/sftp_filer.go
index ac9f83d6c..718290ea4 100644
--- a/weed/sftpd/sftp_filer.go
+++ b/weed/sftpd/sftp_filer.go
@@ -345,7 +345,7 @@ func (fs *SftpServer) putFile(filepath string, reader io.Reader, user *user.User
 	if len(fs.filerSigningKey) > 0 {
 		jwt := security.GenJwtForFilerServer(security.SigningKey(fs.filerSigningKey), fs.filerSigningExpiresAfter)
 		if jwt != "" {
-			req.Header.Set("Authorization", "Bearer "+string(jwt))
+			req.Header.Set("Authorization", security.BearerPrefix+string(jwt))
 		}
 	}
 
diff --git a/weed/shell/command_s3_iam_client.go b/weed/shell/command_s3_iam_client.go
index 3bf405fd1..eb619100a 100644
--- a/weed/shell/command_s3_iam_client.go
+++ b/weed/shell/command_s3_iam_client.go
@@ -41,5 +41,5 @@ func iamAdminAuthContext(ctx context.Context) context.Context {
 	if token == "" {
 		return ctx
 	}
-	return metadata.AppendToOutgoingContext(ctx, "authorization", "Bearer "+string(token))
+	return metadata.AppendToOutgoingContext(ctx, "authorization", security.BearerPrefix+string(token))
 }
diff --git a/weed/shell/command_volume_fsck.go b/weed/shell/command_volume_fsck.go
index 62d75092d..120885145 100644
--- a/weed/shell/command_volume_fsck.go
+++ b/weed/shell/command_volume_fsck.go
@@ -671,7 +671,7 @@ func (c *commandVolumeFsck) httpDelete(path util.FullPath) {
 
 	if c.filerSigningKey != "" {
 		encodedJwt := security.GenJwtForFilerServer(security.SigningKey(c.filerSigningKey), jwtFilerTokenExpirationSeconds)
-		req.Header.Set("Authorization", "BEARER "+string(encodedJwt))
+		req.Header.Set("Authorization", security.BearerPrefix+string(encodedJwt))
 	}
 
 	if *c.verbose {
diff --git a/weed/util/http/http_global_client_util.go b/weed/util/http/http_global_client_util.go
index dc778b56e..c57c0a489 100644
--- a/weed/util/http/http_global_client_util.go
+++ b/weed/util/http/http_global_client_util.go
@@ -152,7 +152,7 @@ func Head(url string) (http.Header, error) {
 
 func maybeAddAuth(req *http.Request, jwt string) {
 	if jwt != "" {
-		req.Header.Set("Authorization", "BEARER "+string(jwt))
+		req.Header.Set("Authorization", security.BearerPrefix+string(jwt))
 	}
 }