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Showing content from https://docs.aws.amazon.com/eventbridge/latest/APIReference/API_TestEventPattern.html below:

TestEventPattern - Amazon EventBridge

TestEventPattern

Tests whether the specified event pattern matches the provided event.

Most services in AWS treat : or / as the same character in Amazon Resource Names (ARNs). However, EventBridge uses an exact match in event patterns and rules. Be sure to use the correct ARN characters when creating event patterns so that they match the ARN syntax in the event you want to match.

Request Syntax

{
   "Event": "string",
   "EventPattern": "string"
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

Event

The event, in JSON format, to test against the event pattern. The JSON must follow the format specified in AWS Events, and the following fields are mandatory:

id
account
source
time
region
resources
detail-type

Type: String

Required: Yes

EventPattern

The event pattern. For more information, see Events and Event Patterns in the Amazon EventBridge User Guide .

Type: String

Length Constraints: Maximum length of 4096.

Required: Yes

Response Syntax

{
   "Result": boolean
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

Result

Indicates whether the event matches the event pattern.

Type: Boolean

Errors

For information about the errors that are common to all actions, see Common Errors.

InternalException

This exception occurs due to unexpected causes.

HTTP Status Code: 500

InvalidEventPatternException

The event pattern is not valid.

HTTP Status Code: 400

Examples Tests that a given event matches a given event pattern

The following is an example of a TestEventPattern request and response.

Sample Request

POST / HTTP/1.1
Host: events.<region>.<domain>
x-amz-Date: <Date>
Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=content-type;date;host;user-agent;x-amz-date;x-amz-target;x-amzn-requestid, Signature=<Signature>
User-Agent: <UserAgentString>
Content-Type: application/x-amz-json-1.1
Content-Length: <PayloadSizeBytes>
Connection: Keep-Alive 
X-Amz-Target: AWSEvents.TestEventPattern

{
    "EventPattern": "{\"source\": [\"com.mycompany.myapp\"]}",
    "Event": "{\"id\": \"e00c66cb-fe7a-4fcc-81ad-58eb60f5d96b\", \"detail-type\": \"myDetailType\", \"source\": \"com.mycompany.myapp\", \"account\": \"123456789012\", \"time\": \"2016-01-10T01:29:23Z\", \"region\": \"us-east-1\", \"resources\": [\"resource1\",  \"resource2\"], \"detail\": {\"key1\": \"value1\", \"key2\": \"value2\"}}"
  }
}

Sample Response

HTTP/1.1 200 OK
x-amzn-RequestId: <RequestId>
Content-Type: application/x-amz-json-1.1
Content-Length: <PayloadSizeBytes>
Date: <Date>

{
    "Result": true
}