AngularJs html metadata was changed by google storage

i have a plan to change my angularJS application hosting from S3 bucket to google storage bucket. But i have problem with metadata of html template files.

i copies with gsutil command and i already set all files in the bucket with public_read permission. Now i can accessing index.html and it serve with text/html content-type, but with template file, it had been changed by google storage to application/xml and status code is 401

Status Code: 401 Unauthorized
Cache-Control: private, max-age=0
Content-Length: 131
Content-Type: application/xml; charset=UTF-8
Date: Thu, 24 May 2018 03:44:21 GMT
Expires: Thu, 24 May 2018 03:44:21 GMT
Server: UploadServer
WWW-Authenticate: Bearer realm=""

Sometime it worked and sometime it didn’t work.. Do you guys know about that?

Source: AngularJS