iOS调用Firebase可调用函数遇too many HTTP redirects错误求助

问题 #

在iOS应用中集成Firebase HTTPS可调用函数时，调用出现too many HTTP redirects错误，错误日志如下：

2023-02-18 19:40:38.701646-0600 Spaces[16235:3277636] Task <48F8CCDC-85B7-451F-9D00-FC93D93B7AFC>.<1> finished with error [-1007] Error Domain=NSURLErrorDomain Code=-1007 "too many HTTP redirects" UserInfo={NSLocalizedDescription=too many HTTP redirects, NSErrorFailingURLStringKey=https://accounts.google.com/v3/signin/rejected?continue=https://uc.appengine.google.com/_ah/conflogin?state%3D~AJKiYcHgSfXKmjn8R3F7NQNdJB-nW8eUS2Xxxojs23jJxTuoOb6Rt2tr-ooa5vw_yCMFz2P1PZUzwzuI-GSUDkbDWHqF-UQ30JQOejlBnzcpcSAKxl60g4hHYnHsvNyJBRHx2z4JxKohRxTwAGiL9ryos8HHOQp1_0GOfqHncrBjMwXXdHNJoWAXtJ4-bf7K3sfh32yXYxEIkKiTadJMenpzjDp4MCu8LbG5OXVXI1tXqAouERC_B4-JQA2esYzTGw704LdBdksK&dsh=S1057996816:1676770836995843&flowEntry=ServiceLogin&flowName=WebLiteSignIn&ifkv=AWnogHcLgDBo5gsyBrVbQJMIcoCwk3TXQujaljG27PM2wEBBNE0chcGuSa8bvjDtbyfz1Ii6UodjEw&rhlk=no&rrk=32, NSErrorFailingURLKey=https://accounts.google.com/v3/signin/rejected?continue=https://uc.appengine.google.com/_ah/conflogin?state%3D~AJKiYcHgSfXKmjn8R3F7NQNdJB-nW8eUS2Xxxojs23jJxTuoOb6Rt2tr-ooa5vw_yCMFz2P1PZUzwzuI-GSUDkbDWHqF-UQ30JQOejlBnzcpcSAKxl60g4hHYnHsvNyJBRHx2z4JxKohRxTwAGiL9ryos8HHOQp1_0GOfqHncrBjMwXXdHNJoWAXtJ4-bf7K3sfh32yXYxEIkKiTadJMenpzjDp4MCu8LbG5OXVXI1tXqAouERC_B4-JQA2esYzTGw704LdBdksK&dsh=S1057996816:1676770836995843&flowEntry=ServiceLogin&flowName=WebLiteSignIn&ifkv=AWnogHcLgDBo5gsyBrVbQJMIcoCwk3TXQujaljG27PM2wEBBNE0chcGuSa8bvjDtbyfz1Ii6UodjEw&rhlk=no&rrk=32, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <48F8CCDC-85B7-451F-9D00-FC93D93B7AFC>.<1>"
), _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <48F8CCDC-85B7-451F-9D00-FC93D93B7AFC>.<1>, NSUnderlyingError=0x28045b2a0 {Error Domain=kCFErrorDomainCFNetwork Code=-1007 "(null)"}}

可调用函数代码 #

import * as functions from "firebase-functions";
import * as admin from "firebase-admin";

admin.initializeApp();
// const fcm = admin.messaging();
const db = admin.firestore();

exports.addNumbers = functions.https.onCall((data) => {
    // [END addFunctionTrigger]
      // [START readAddData]
      // Numbers passed from the client.
      const firstNumber = data.firstNumber;
      const secondNumber = data.secondNumber;
      // [END readAddData]
    
      // [START addHttpsError]
      // Checking that attributes are present and are numbers.
      if (!Number.isFinite(firstNumber) || !Number.isFinite(secondNumber)) {
        // Throwing an HttpsError so that the client gets the error details.
        throw new functions.https.HttpsError('invalid-argument', 'The function must be called with ' +
            'two arguments "firstNumber" and "secondNumber" which must both be numbers.');
      }
      // [END addHttpsError]
    
      // [START returnAddData]
      // returning result.
      return {
        firstNumber: firstNumber,
        secondNumber: secondNumber,
        operator: '+',
        operationResult: firstNumber + secondNumber,
      };
      // [END returnAddData]
    });

iOS端Swift调用代码 #

func callNumbers() {
DispatchQueue.global(qos: .background).async {
functions.httpsCallable("addNumbers").call(["firstNumber": 10, "secondNumber": 5]) { result, error in
                if let error = error as NSError? {
                    if error.domain == FunctionsErrorDomain {
                        let code = FunctionsErrorCode(rawValue: error.code)
                        let message = error.localizedDescription
                        let details = error.userInfo[FunctionsErrorDetailsKey]
                    }
                    // ...
                }
                if let data = result?.data {
                   print(data)
                }
            }
        }
}

需要解决该问题，实现通过可调用函数在服务器端执行任务。

解决方案 #

• 检查函数权限配置
  这个错误大多是身份验证流程循环重定向导致。如果你的addNumbers函数不需要用户登录即可调用，在Firebase控制台的函数页面，进入该函数的权限设置，将访问权限改为允许所有用户调用（测试环境可用，生产环境需根据业务需求配置严格权限）。同时确认函数代码中没有强制要求未登录用户跳转认证的逻辑。

• 验证iOS端Firebase初始化
  确保FirebaseApp.configure()在AppDelegate的application(_:didFinishLaunchingWithOptions:)方法中正确调用，且GoogleService-Info.plist文件完整无误，包含正确的项目ID、API密钥、应用ID等信息，避免因配置错误触发异常重定向。

• 确认函数部署状态
  执行firebase functions:log查看函数部署日志，确认函数已成功上线且无报错。也可以在Firebase控制台的函数页面，直接测试addNumbers函数（传入{"firstNumber":10,"secondNumber":5}），验证函数本身是否能正常返回结果。

• 清除设备缓存与网络重置
  设备端的网络缓存可能引发重定向循环，尝试清除应用缓存、重启设备，或切换网络环境（比如从Wi-Fi切到移动数据）后重新测试调用。

• 排查手动URL配置
  确保iOS端没有手动指定函数的调用URL，完全依赖Firebase SDK自动获取的默认端点。如果之前有手动配置URL的代码，直接移除，避免因URL错误导致的重定向问题。

内容的提问来源于stack exchange，提问作者SamP