如何通过Google FCM API单次POST请求发送多条推送通知？

No, Firebase Cloud Messaging (FCM) does not support sending multiple unique notification payloads in a single standard POST request. Each FCM request is designed to deliver one notification (or data message) to a target set of devices (specified via condition, topic, or registration tokens).

Alternative: Use FCM Batch Requests #

To cut down on network overhead while sending multiple distinct notifications, you can bundle multiple FCM send requests into one HTTP call using Google Cloud's batch request mechanism. This uses a single TCP connection instead of multiple, reducing latency and overhead.

How to implement batch requests: #

1. Create each individual FCM request as you normally would (each with its own condition and notification payload).
2. Wrap all requests into a single batch request following the multipart/mixed content type format required by Google's batch API.

Example batch request structure:

POST https://fcm.googleapis.com/batch HTTP/1.1
Host: fcm.googleapis.com
Authorization: key=YOUR_SERVER_KEY
Content-Type: multipart/mixed; boundary=batch_boundary

--batch_boundary
Content-Type: application/http
Content-Transfer-Encoding: binary

POST /fcm/send HTTP/1.1
Content-Type: application/json

{
  "condition":"my condition",
  "notification":{
     "title" : "the title 1",
     "body":"the body 1"
  }
}

--batch_boundary
Content-Type: application/http
Content-Transfer-Encoding: binary

POST /fcm/send HTTP/1.1
Content-Type: application/json

{
  "condition":"my condition",
  "notification":{
     "title" : "the title 2",
     "body":"the body 2"
  }
}

--batch_boundary--

Key details about batch requests: #

• A single batch can include up to 500 individual FCM requests.
• The response will be a multipart message containing results for each request, so you can handle successes or failures per notification.
• This approach reduces network overhead but each individual notification still counts as a separate FCM message against your quota.

Additional Notes #

• If your notifications target the same devices but need to display as separate messages, each requires its own FCM payload—there’s no way to combine them into one request.
• On the client side, each FCM message will trigger a separate notification (assuming your app is configured to display them).

内容的提问来源于stack exchange，提问作者Mohsen Mirshahreza