A function URL is a dedicated HTTP(S) endpoint for your Lambda function. You can create and configure a function URL through the Lambda console or the Lambda API. When you create a function URL, Lambda automatically generates a unique URL endpoint for you. Function URL endpoints have the following format:
https://<url-id>.lambda-url.<region>.on.aws
Lambda generates the <url-id> portion of the endpoint based on a number of factors, including your AWS account ID. Because this process is deterministic, it may be possible for anyone to retrieve your account ID from the <url-id>.
Function URLs are dual stack-enabled, supporting IPv4 and IPv6. After you configure a function URL for your function, you can invoke your function through its HTTP(S) endpoint via a web browser, curl, Postman, or any HTTP client. Lambda function URLs use resource-based policies for security and access control. Function URLs also support cross-origin resource sharing (CORS) configuration options.
You can apply function URLs to any function alias, or to the $LATEST unpublished function version. You can't add a function URL to any other function version.
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