No servidor de testegoapp serv ele funciona, no próprio aplicativo ele é sobrescrito pelo application / octet-stream.

Como posso dizer ao appengine para parar de fazer isso?

Could not guess mimetype for home/fonts/FontAwesome.otf. Using application/octet-stream...

Meu arquivo de configuração:

application: test
version: 0
runtime: go
api_version: go1
threadsafe: true

handlers:
 - url: /home
   static_dir: home

 - url: /home/font/(.*\.woff)
   static_files: home/font/\1
   upload: home/font/(.*\.woff)
   http_headers:
    Content-Type: application/font-woff

 - url: /home/font/(.*\.svg)
   static_files: home/font/\1
   upload: home/font/(.*\.svg)
   http_headers:
    Content-Type: image/svg+xml

 - url: /home/font/(.*\.eot)
   static_files: home/font/\1
   upload: home/font/(.*\.eot)
   http_headers:
    Content-Type: application/vnd.ms-fontobject

 - url: /home/font/(.*\.ttf)
   static_files: home/font/\1
   upload: home/font/(.*\.ttf)
   http_headers:
    Content-Type: application/x-font-ttf

 - url: /home/font/(.*\.otf)
   static_files: home/font/\1
   upload: home/font/(.*\.otf)
   http_headers:
    Content-Type: application/x-font-otf

 - url: /favicon.ico
   static_files: home/favicon.ico
   upload: home/favicon.ico

 - url: /documentation
   static_dir: documentation

 - url: /.*
   script: _go_app

inbound_services:
 - warmup