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Lambda: Include support for custom URL aliases #1410

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Aug 6, 2024
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Lambda: Include support for custom URL aliases #1410

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39 changes: 29 additions & 10 deletions content/en/user-guide/aws/lambda/index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -66,18 +66,10 @@ $ awslocal lambda create-function \
--handler index.handler \
--role arn:aws:iam::000000000000:role/lambda-role \
--tags '{"_custom_id_":"my-custom-subdomain"}'
$ awslocal lambda create-function-url-config \
--function-name localstack-lambda-url-example \
--auth-type NONE
{
"FunctionUrl": "http://my-custom-subdomain.lambda-url.<region>...",
....
}
{{< / command >}}
You must specify the `_custom_id_` tag **before** using the `create-function-url-config` command.
You must specify the `_custom_id_` tag **before** <a href="#create-a-function-url">creating a Function URL</a>.
After the URL configuration is set up, any modifications to the tag will not affect it.
At present, custom IDs can be assigned only to the `$LATEST` version of the function.
LocalStack does not yet support custom IDs for function version aliases.
LocalStack supports assigning custom IDs to both the `$LATEST` version of the function or to an existing version alias.
{{< /callout >}}

{{< callout >}}
Expand Down Expand Up @@ -124,6 +116,33 @@ $ awslocal lambda create-function-url-config \
This will generate a HTTP URL that can be used to invoke the Lambda function.
The URL will be in the format `http://<XXXXXXXX>.lambda-url.us-east-1.localhost.localstack.cloud:4566`.

{{< callout "note">}}
As previously mentioned, when a Lambda Function has a `_custom_id_` tag, LocalStack sets this tag's value as the subdomain in the Function's URL.

{{< command >}}
$ awslocal lambda create-function-url-config \
--function-name localstack-lambda-url-example \
--auth-type NONE
{
"FunctionUrl": "http://my-custom-subdomain.lambda-url.<region>...",
....
}
{{< / command >}}

In addition, if you pass an an existing version alias as a `Qualifier` to the request, the created URL will combine the custom ID and the alias in the form `<custom-id>-<alias>`.

{{< command >}}
$ awslocal lambda create-function-url-config \
--function-name localstack-lambda-url-example \
--auth-type NONE
--qualifier test-alias
{
"FunctionUrl": "http://my-custom-subdomain-test-alias.lambda-url.<region>...",
....
}
{{< / command >}}
{{< /callout >}}

### Trigger the Lambda function URL

You can now trigger the Lambda function by sending a HTTP POST request to the URL using `cURL` or your REST HTTP client:
Expand Down