Invoking a function

Note

To allow any user to invoke (call) a function, make it public. For more information about rights, see Access management.

To access a function, use its name or unique ID. To find them, get a list of functions in a folder.

As an example, we'll use the function described in Creating a function version.

Management console

HTTP

CLI

Invoke the function:

Select Cloud Functions in management console.
Click in the row of the function you want to invoke.
In the window that opens, go to Testing.
In the Tag version field, specify which function version to invoke.
Under Payload template, choose one of the options:
- Without preset: Custom data format.
- HTTP call: HTTP call data format for a function acting as an HTTP request handler.
- Trigger for Message Queue: Data format for the function called by a trigger in order to process messages from the queue.
In the Input field, enter the input data to test the function.
Click Run test.
You will see the testing status under Test result in the Function status field. Important: The maximum function execution time before timeout (including original initialization at first call) is 10 minutes.
You will see the data processed by the function in the Function output field.

Note

For security reasons, the function can only be called using TLS protocol.

Call the function as a regular HTTP request, such as by entering the function call link in your browser address bar. Call link format:

https://functions.yandexcloud.net/<function ID>

The function call link is also shown in the http_invoke_url parameter when creating a function.

You can call a specific function version using the tag parameter. The function with the $latest tag is called by default.

Example of function call with no additional parameters:
```
https://functions.yandexcloud.net/b09bhaokchn9pnbrlseb
```
The response depends on the function you call. In this case, it will be as follows:
```
Hello, World!
```
Example of function call with the name parameter added to the URL:
```
https://functions.yandexcloud.net/b09bhaokchn9pnbrlseb?name=<user name>
```
The following response appears on the page:
```
Hello, Username!
```
Example of calling a specific function version with the tag parameter added to the URL:
```
https://functions.yandexcloud.net/b09bhaokchn9pnbrlseb?tag=<version tag>
```

You can call a specific function version using the --tag parameter. The function with the $latest tag is called by default.

Call the function by specifying in the parameter a name for еру greeting:

$ yc serverless function invoke <function ID> -d '{"queryStringParameters": {"name": "Username"}}'

Result:

{"statusCode": 200, "headers": {"Content-Type": "text/plain"}, "isBase64Encoded": false, "body": "Hello, Username!"}

Use a tag to call a specific function version:

$ yc serverless function invoke <function ID> --tag <function version tag>

To learn more about function structure dependence for different invocation methods (HTTP and CLI), see Invoking a function.