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Showing content from https://www.alibabacloud.com/help/en/functioncompute/fc-2-0/developer-reference/api-invokefunction below:

InvokeFunction - Function Compute - Alibaba Cloud Documentation Center

Invokes a function.

Request headers

This operation uses only common request headers. For more information, see Common parameters.

Parameter Type Required Examples Description X-Fc-Invocation-Type String No Sync

The invocation method. Valid values:

Sync: synchronous invocation
Async: asynchronous invocation

X-Fc-Log-Type String No None

The method used to return logs. Valid values:

Tail: returns the last 4 KB of logs that are generated for the current request.
None: No logs are returned for the current request. Default value: None.

X-Fc-Stateful-Async-Invocation-Id String No g6u*****iyvhd3jk8s6bhj0hh

The ID of the asynchronous task. You must enable the asynchronous task feature in advance.

Note When you use an SDK to invoke a function, we recommend that you specify a business-related ID to facilitate subsequent operations. For example, you can use the video name as the invocation ID for a video-processing function. After that, you can use the ID to check whether the video is processed or terminate the processing of the video. The ID must start with a letter or an underscore (_), and can contain letters, digits, underscores (_), and hyphens (-). The ID can be up to 128 characters in length. If you do not specify the ID of the asynchronous invocation, Function Compute automatically generates an ID.

Request syntax

POST /services/{serviceName.qualifier}/functions/{functionName} HTTP/1.1

Request parameters Parameter Type Location Required Example Description serviceName String Path Yes service_name

The name of the service.

qualifier String Path No LATEST

The version or alias of the service.

functionName String Path Yes function_name

The name of the function.

String Body Yes {"key1": "value1"}

The event of the function. The value of this parameter is a binary array. Function Compute passes the event to the function for processing.

Response parameters Parameter Type Example Description X-Fc-Error-Type String UnhandledInvocationError

The type of errors returned after the function is invoked. Valid values:

HandledInvocationError: errors returned when a callback function is executed in Node.js. For more information, see Error handling.
UnhandledInvocationError: all errors except those of the HandledInvocationError type. For more information, see Error handling.

X-Fc-Log-Result String demo log result

The returned log results.

X-Fc-Code-Checksum String 5697641582914695457

The CRC-64 value of the function code package.

X-Fc-Stateful-Async-Invocation-Id String g6u*****iyvhd3jk8s6bhj0hh

The ID of the asynchronous task. You must enable the asynchronous task feature in advance.

Note When you use an SDK to invoke a function, we recommend that you specify a business-related ID to facilitate subsequent operations. For example, you can use the video name as the invocation ID for a video-processing function. After that, you can use the ID to check whether the video is processed or terminate the processing of the video. The ID must start with a letter or an underscore (_), and can contain letters, digits, underscores (_), and hyphens (-). The ID can be up to 128 characters in length. Function Compute generates an ID for the asynchronous task if it is not specified.

X-Fc-Instance-Id String 7c43576b-48b1-4c3a-86e5-dcb01872****

The ID of the function instance.

X-Fc-Request-Id String dab25e58-9356-4e3f-97d6-f044c4****

The request ID of the function invocation.

X-Fc-Max-Memory-Usage String 9.2

The memory consumed by the function execution. Unit: MB.

X-Fc-Invocation-Duration String 10

The duration consumed by the function execution, in milliseconds.

X-Fc-Invocation-Service-Version String LATEST

The version or alias of the called function.

String hello world

The result returned after the function is invoked. You can specify the result returned.

Examples

Sample requests

POST /services/{serviceName.qualifier}/functions/function_name HTTP/1.1
Host:fc-ram.aliyuncs.com
X-Fc-Invocation-Type:Sync
X-Fc-Log-Type:None
X-Fc-Stateful-Async-Invocation-Id:g6u*****iyvhd3jk8s6bhj0hh
Content-Type:application/json

{"key1": "value1"}

Sample success responses

JSON format

HTTP/1.1 200 OK
Content-Type:application/json

{
  "result" : "hello world"
}

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