Firebase的云功能:试图从实时数据库读取的标题错误

Question

在尝试从云功能访问firebase实时数据库时，我会遇到这个奇怪的错误，我无法想出有关如何修复它的任何想法。这是我的代码：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
exports.createNewGame = functions.https.onRequest((request, response) => {
        return admin.database().ref().once('value').then(function (data) {
                console.log("BLA");
                response.end();
        });
});

和错误：

info: User function triggered, starting execution
info: Execution took 60010 ms, finished with status: 'timeout'
info: Execution took 60046 ms, finished with status: 'crash'
error: Something went wrong with the function!
error:  Error: Can't set headers after they are sent.
    at validateHeader (_http_outgoing.js:504:11)
    at ServerResponse.setHeader (_http_outgoing.js:511:3)
    at ServerResponse.header (C:UsersThugmAppDataRoamingnpmnode_modulesfirebase-toolsnode_modulesexpresslibresponse.js:730:10)
    at ServerResponse.send (C:UsersThugmAppDataRoamingnpmnode_modulesfirebase-toolsnode_modulesexpresslibresponse.js:170:12)
    at ServerResponse.json (C:UsersThugmAppDataRoamingnpmnode_modulesfirebase-toolsnode_modulesexpresslibresponse.js:256:15)
    at ProxyServer.Supervisor._proxy.on (C:U[e-mail]:104:14)
    at ProxyServer.emit (C:UsersThugmAppDataRoamingnpmnode_modulesfirebase-toolsnode_moduleseventemitter3index.js:144:27)
    at ClientRequest.proxyError (C:UsersThugmAppDataRoamingnpmnode_modulesfirebase-toolsnode_moduleshttp-proxylibhttp-proxypassesweb-incoming.js:156:18)
    at emitOne (events.js:115:13)
    at ClientRequest.emit (events.js:210:7)

如果有人甚至可以将我指向找到解决方案的正确方向，那将不胜感激。欢呼！

Answer 1

带有HTTP功能，您不会像其他类型的功能那样返回承诺。当您完全发送响应到客户端时，HTTP功能将终止。

尝试使用response.send("")之类的内容在读取数据后用空响应完成功能：

exports.createNewGame = functions.https.onRequest((request, response) => {
    admin.database().ref().once('value').then(function (data) {
        console.log("BLA");
        response.send("");
    });
});