本指南将介绍如何 Google Analytics Measurement Protocol 网站和应用数据流 事件 Google Analytics 服务器，以便您可以在以下位置查看 Measurement Protocol 事件： Google Analytics 报告。
请选择您想在本指南中查看哪个平台的信息：
设置请求格式
Google Analytics Measurement Protocol 仅支持 HTTP POST 请求。
如要发送事件，请使用以下格式：
POST /mp/collect HTTP/1.1
HOST: www.google-analytics.com
Content-Type: application/json
<payload_data>
必须在请求网址中提供以下内容：
api_secret：Google Analytics 界面中生成的 API 密钥。如需创建新的密钥，请依次点击管理 > 数据流 > 选择您的数据流 > Measurement Protocol > 创建。
firebase_app_id：Firebase 应用 ID，可在 Firebase 控制台的以下位置下找到：项目设置 > 常规 > 您的应用 > 应用 ID。firebase_app_id不同于app_instance_id。firebase_app_id用于标识您的应用，而app_instance_id用于标识应用的单次安装。
如需获取完整的参考信息，请参阅查询参数。
必须在请求正文中提供以下内容：
app_instance_id：Firebase 应用实例的唯一标识符。该标识符与网站client_id不同：
user_id：可选。用户的唯一标识符。只能包含 UTF-8 字符。如需详细了解此标识符，请参阅使用 User-ID 进行跨平台分析。consent：可选。了解如何设置用户意见征求设置。timestamp_micros：可选。Unix 纪元时间（以微秒为单位）， 事件和用户属性。如果未指定，则默认为 请求的时间点。events：一个由多个事件项构成的数组。您可以在一个事件中包含多个事件 请求。若要让报告显示用户活动，例如 实时、
engagement_time_msec和session_id必须作为params，表示event。engagement_time_msec参数应反映 事件的互动时长（以毫秒为单位）。示例如下：
{
"app_instance_id": "12345678901234567890123456789012",
"events": [
{
"name": "campaign_details",
"params": {
"campaign_id": "google_1234",
"campaign": "Summer_fun",
"source": "google",
"medium": "cpc",
"term": "summer+travel",
"content": "logolink",
"session_id": "123",
"engagement_time_msec": "100"
}
}
]
}
```
While `session_start` is a [reserved event
name](/analytics/devguides/collection/protocol/ga4/reference#reserved_names),
creating a new `session_id` creates a new session without the need to send
`session_start`. Understand how [sessions are
counted](//support.google.com/analytics/answer/9191807).
## Try it
Here's an example you can use to send a [`tutorial_begin`] event to your Google
Analytics server:
```javascript
const firebase_app_id = `1:1234567890:android:321abc456def7890`;
const api_secret = `<secret_value>`;
fetch(`https://www.google-analytics.com/mp/collect?firebase_app_id=${firebase_app_id}&api_secret=${api_secret}`, {
method: "POST",
body: JSON.stringify({
app_instance_id: 'app_instance_id',
events: [{
name: 'tutorial_begin',
params: {},
}]
})
});
```
The format of `firebase_app_id` is platform specific. See **Application ID**
under [Firebase config files and objects].
## Override timestamp
The Measurement Protocol uses the *first* timestamp it finds in the following
list for each event in the request:
1. The `timestamp_micros` of the event.
1. The `timestamp_micros` of the request.
1. The time that the Measurement Protocol receives the request.
The following example sends a request-level timestamp that applies to all of
the events in the request. As a result, the Measurement Protocol assigns both the
`tutorial_begin` and `join_group` events a timestamp of
`requestUnixEpochTimeInMicros`.
```javascript
{
"timestamp_micros": requestUnixEpochTimeInMicros,
"events": [
{
"name": "tutorial_begin"
},
{
"name": "join_group",
"params": {
"group_id": "G_12345",
}
}
]
}
```
The following example sends both a request-level timestamp and an event-level
timestamp. As a result, the Measurement Protocol assigns the `tutorial_begin`
event a timestamp of `tutorialBeginUnixEpochTimeInMicros`, and the `join_group`
event a timestamp of `requestUnixEpochTimeInMicros`.
```javascript
{
"timestamp_micros": requestUnixEpochTimeInMicros,
"events": [
{
"name": "tutorial_begin",
"timestamp_micros": tutorialBeginUnixEpochTimeInMicros
},
{
"name": "join_group",
"params": {
"group_id": "G_12345",
}
}
]
}
```
## Limitations
The following limitations apply to sending Measurement Protocol events to Google
Analytics:
Note: For information on the limitations of 360 features, see [Google Analytics
360](//support.google.com/analytics/answer/11202874).
* Requests can have a maximum of 25 events.
* Events can have a maximum of 25 parameters.
* Events can have a maximum of 25 user properties.
* User property names must be 24 characters or fewer.
* User property values must be 36 characters or fewer.
* Event names must be 40 characters or fewer, can only contain alpha-numeric
characters and underscores, and must start with an alphabetic character.
* Parameter names including item parameters must be 40 characters or fewer,
can only contain alpha-numeric characters and underscores, and must start
with an alphabetic character.
* Parameter values including item parameter values must be 100 characters or
fewer for a standard Google Analytics property, and 500 characters or fewer
for a Google Analytics 360 property.
* Item parameters can have a maximum of 10 custom parameters.
* The post body must be smaller than 130kB.
* App Measurement Protocol events sent to Google Analytics 4 don't populate
Search audiences in Google Ads for app users.
For additional requirements of each use case, see [common use cases].