是什么导致Google JavaScript API发现失败？

Question

我正在为浏览器使用Google JavaScript API，但间歇性地失败了，但以下异常：gapi.client.Error: API discovery response missing required fields。是什么原因造成的？

我的用于加载API的代码如下所示，我基本上是将脚本节点注入DOM中以加载API，将整个内容包装在Promise链中以便在就绪时进行处理：

new Promise((resolve, reject) => {
  const script = document.createElement('script')
  script.onload = resolve
  script.onerror = reject
  document.currentScript.parentNode.insertBefore(script, document.currentScript)
  script.src = 'https://apis.google.com/js/api.js'
})
  .then(() => {
    return new Promise((resolve) => {
      gapi.load('client:auth2', resolve)
    })
  })
  .then(() => {
    return gapi.client.init({
      discoveryDocs: ['https://www.googleapis.com/discovery/v1/apis/calendar/v3/rest',],
      apiKey: initialState.googleApiKey,
      clientId: initialState.oauthClientId,
      scope: 'email profile https://www.googleapis.com/auth/calendar',
    })
  })

追溯如下：

gapi.client.Error: API discovery response missing required fields.
at new wY (https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.en_US.nyHIlPOzvxo.O/m=auth2,client/rt=j/sv=1/d=1/ed=1/am=AQ/rs=AGLTcCNWHYGSUbRcGfoOSnVtpSAoqp5S-Q/cb=gapi.loaded_0:653:491)
at f (https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.en_US.nyHIlPOzvxo.O/m=auth2,client/rt=j/sv=1/d=1/ed=1/am=AQ/rs=AGLTcCNWHYGSUbRcGfoOSnVtpSAoqp5S-Q/cb=gapi.loaded_0:696:457)
at h.o0 (https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.en_US.nyHIlPOzvxo.O/m=auth2,client/rt=j/sv=1/d=1/ed=1/am=AQ/rs=AGLTcCNWHYGSUbRcGfoOSnVtpSAoqp5S-Q/cb=gapi.loaded_0:79:171)
at xs (https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.en_US.nyHIlPOzvxo.O/m=auth2,client/rt=j/sv=1/d=1/ed=1/am=AQ/rs=AGLTcCNWHYGSUbRcGfoOSnVtpSAoqp5S-Q/cb=gapi.loaded_0:82:245)
at Wq (https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.en_US.nyHIlPOzvxo.O/m=auth2,client/rt=j/sv=1/d=1/ed=1/am=AQ/rs=AGLTcCNWHYGSUbRcGfoOSnVtpSAoqp5S-Q/cb=gapi.loaded_0:82:96)
at null._.C.uea (https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.en_US.nyHIlPOzvxo.O/m=auth2,client/rt=j/sv=1/d=1/ed=1/am=AQ/rs=AGLTcCNWHYGSUbRcGfoOSnVtpSAoqp5S-Q/cb=gapi.loaded_0:81:242)
at Ap (https://apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.en_US.nyHIlPOzvxo.O/m=auth2,client/rt=j/sv=1/d=1/ed=1/am=AQ/rs=AGLTcCNWHYGSUbRcGfoOSnVtpSAoqp5S-Q/cb=gapi.loaded_0:75:300)