Could someone please explain the difference between accessing Lambda via the test gateway API (proxy) and CLI?

When I make a request via curl, only the body content is sent to the Lambda function’s event.

curl --location --request POST 'https://xxxxx.execute-api.eu-central-1.amazonaws.com/live/request' 
--header 'Content-Type: application/json' 
--data '{
    "date": "2025-02-14",
    "time": "15:00",
    "quantity": 101
}'

event content in lambda function:

{
    "date": "2025-02-14",
    "time": "15:00",
    "quantity": 101
}

But when I make a request through the test within the gateway API itself, I can see more information, including the invoked method type like POST.

{
  'resource': '/request',
  'path': '/request',
  'httpMethod': 'POST',
  'headers': None,
  'multiValueHeaders': None,
  'queryStringParameters': None,
  'multiValueQueryStringParameters': None,
  'pathParameters': None,
  'stageVariables': None,
  'requestContext': {
    'resourceId': 'xxxxx',
    'resourcePath': '/request',
    'httpMethod': 'POST',
    'extendedRequestId': 'xxxxxxxxxxx',
    'requestTime': '11/May/2024:08:52:23 +0000',
    'path': '/request',
    'accountId': '11111111111',
    'protocol': 'HTTP/1.1',
    'stage': 'test-invoke-stage',
    'domainPrefix': 'testPrefix',
    'requestTimeEpoch': 1715417543338,
    'requestId': 'xxxxxxx-xxxxx',
    'identity': {
      'cognitoIdentityPoolId': None,
      'cognitoIdentityId': None,
      'apiKey': 'test-invoke-api-key',
      'principalOrgId': None,
      'cognitoAuthenticationType': None,
      'userArn': 'arn:aws:sts::xxxxxxxxx:assumed-role/xxxxxxx/xxxxxx',
      'apiKeyId': 'txxxxxxx',
      'userAgent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36',
      'accountId': 'xxxxxxxx',
      'caller': 'xxxxx',
      'sourceIp': 'xxxxx',
      'accessKey': 'xxxxxx',
      'cognitoAuthenticationProvider': None,
      'user': 'xxxxxxxxxx'
    },
    'domainName': 'xxxxx',
    'apiId': 'xxxxxxx'
  },
  'body': '{n    "date": "2025-02-14",n    "time": "15:00",n    "quantity": 101n}',
  'isBase64Encoded': False
}

Why does this happen? And to get all this info via curl?