s3: report http.StatusOK if the directory is explicitly created

fix https://github.com/seaweedfs/seaweedfs/issues/3457

weed/s3api/s3_constants/header.go

@@ -36,6 +36,8 @@ const (
 	AmzObjectTaggingPrefix    = "X-Amz-Tagging-"
 	AmzObjectTaggingDirective = "X-Amz-Tagging-Directive"
 	AmzTagCount               = "x-amz-tagging-count"
+
+	X_SeaweedFS_Header_Directory_Key = "x-seaweedfs-is-directory-key"
 )
 
 // Non-Standard S3 HTTP request constants

weed/s3api/s3api_object_handlers.go

@@ -393,6 +393,12 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des
 		return
 	}
 
+	if resp.Header.Get(s3_constants.X_SeaweedFS_Header_Directory_Key) == "true" {
+		responseStatusCode := responseFn(resp, w)
+		s3err.PostLog(r, responseStatusCode, s3err.ErrNone)
+		return
+	}
+
 	// when HEAD a directory, it should be reported as no such key
 	// https://github.com/seaweedfs/seaweedfs/issues/3457
 	if resp.ContentLength == -1 && resp.StatusCode != http.StatusNotModified {

weed/server/filer_server_handlers_read.go

@@ -111,6 +111,10 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 			w.WriteHeader(http.StatusMethodNotAllowed)
 			return
 		}
+		if entry.Attr.Mime != "" {
+			// inform S3 API this is a user created directory key object
+			w.Header().Set(s3_constants.X_SeaweedFS_Header_Directory_Key, "true")
+		}
 		fs.listDirectoryHandler(w, r)
 		return
 	}