Google API客户端无法初始化Cloud Endpoints API

如何解决Google API客户端无法初始化Cloud Endpoints API

我有一个基于Google Cloud Endpoints构建的API，并且在使用API​​的发现文档通过gapi.client加载端点时遇到了麻烦。 gapi.client库加载没有问题，但是我的API无法初始化，因为gapi.client尝试加载https://[PROJECT_ID].appspot.com/static/proxy.html而不是https://[PROJECT_ID].appspot.com/_ah/api/static/proxy.html。

我已经用https://apis.google.com/js/api.js和https://apis.google.com/js/client.js测试了以下代码，并且都产生了相同的结果。如果有人能解释这两个文件之间的区别，也将不胜感激。

以下是用于加载API的JavaScript（加载https://apis.google.com/js/api.js后执行）：

gapi.load('client',function() {

  // executes.
  console.log("client ready");

  gapi.client.init({
    discoveryDocs: ["url-path-to-discovery-doc-see-below"]
  }).then(function(response) {

    // never executed
    console.log("load response",response);

    if (listeners != null && 0 < listeners.length) {
      for (let obj in listeners) {
        const callback = obj.callback;
        if (typeof callback == 'function') {
          callback.call(obj.context);
        }
      }
    }
  }).catch(function(response) {
    // never executed
    console.log("init failed",response);
  });
});

then和catch回调永远不会执行，并且脚本会在尝试访问https://[PROJECT_ID].appspot.com/static/proxy.html?inconsequential-query-string时引发404错误。

在浏览器中访问https://[PROJECT_ID].appspot.com/_ah/api/static/proxy.html会按预期加载。

这是我的发现文档（使用endpoints-framework-maven-plugin生成），[PROJECT_ID]的实例已替换为实际的Google Cloud Project ID：

{
 "auth": {
  "oauth2": {
   "scopes": {
    "https://www.googleapis.com/auth/userinfo.email": {
     "description": "View your email address"
    }
   }
  }
 },"basePath": "/_ah/api/myapi/v1/","baseUrl": "https://[PROJECT_ID].appspot.com/_ah/api/myapi/v1/","batchPath": "batch","description": "This is an API","discoveryVersion": "v1","icons": {
  "x16": "https://www.gstatic.com/images/branding/product/1x/googleg_16dp.png","x32": "https://www.gstatic.com/images/branding/product/1x/googleg_32dp.png"
 },"id": "auth:v1","kind": "discovery#restDescription","name": "myapi","parameters": {
  "alt": {
   "default": "json","description": "Data format for the response.","enum": [
    "json"
   ],"enumDescriptions": [
    "Responses with Content-Type of application/json"
   ],"location": "query","type": "string"
  },"fields": {
   "description": "Selector specifying which fields to include in a partial response.","key": {
   "description": "API key. Your API key identifies your project and provides you with API access,quota,and reports. Required unless you provide an OAuth 2.0 token.","oauth_token": {
   "description": "OAuth 2.0 token for the current user.","prettyPrint": {
   "default": "true","description": "Returns response with indentations and line breaks.","type": "boolean"
  },"quotaUser": {
   "description": "Available to use for quota purposes for server-side applications. Can be any arbitrary string assigned to a user,but should not exceed 40 characters. Overrides userIp if both are provided.","userIp": {
   "description": "IP address of the site where the request originates. Use this if you want to enforce per-user limits.","type": "string"
  }
 },"protocol": "rest","resources": {
  "test": {
   "methods": {
    "get": {
     "description": "Test endpoint GET method.","httpMethod": "GET","id": "myapi.test.get","parameterOrder": [
      "message"
     ],"parameters": {
      "message": {
       "location": "query","required": true,"type": "string"
      }
     },"path": "test.get","response": {
      "$ref": "Response"
     },"scopes": [
      "https://www.googleapis.com/auth/userinfo.email"
     ]
    },"post": {
     "description": "Test endpoint POST method.","httpMethod": "POST","id": "myapi.test.post","path": "test.post","scopes": [
      "https://www.googleapis.com/auth/userinfo.email"
     ]
    }
   }
  }
 },"rootUrl": "https://[PROJECT_ID].appspot.com/_ah/api/","schemas": {
  "Response": {
   "id": "Response","properties": {
    "message": {
     "description": "","type": "string"
    },"status": {
     "description": "","type": "string"
    }
   },"type": "object"
  }
 },"servicePath": "myapi/v1/","title": "My Endpoints","version": "v1"
}

其他思想和笔记：

似乎需要在某个地方设置API“ root”（/ _ ah / api），但是我发现的所有文档似乎都显示了对设置root的支持。

API是用Java内置的，并利用了来自[Maven：com.google.endpoints：endpoints-framework：2.2.1]的Google API批注。 @Api批注确实允许root和backendRoot字段，但两个字段均已弃用。

使用gapi.client.load加载时，API会按预期加载，但是根据documentation，不赞成使用此加载功能。

gapi.client.load('myapi','v1',function() {
  console.log("myapi ready");
  gapi.client.myapi.test.post({
    message: "Hello,API!"
  }).execute(function(response) {
    // expected response from API.
    console.log(response);
  });
},'https://[PROJECT_ID].appspot.com/_ah/api');

非常感谢。