Deno HTTP Server Example

Created an example web service in Deno to experiment and answer some fundamental questions of the Deno runtime, such as library support, easy of use, and other developer experience related aspects of the environment.

Basic HTTP Service

Running the basic HTTP service is extremely simple.

deno run ./src/main.ts

Deno is a sandbox runtime by default, which means it needs to be granted explicit permissions to interact with services, areas of the filesystem, environment variables and other functionality external to the runtime environment.

To avoid interactive prompts, run the HTTP service with the following arguments.

deno run --allow-env --allow-net ./src/main.ts 

Lambda HTTP Service

Use the docker-compose up command to run the example service as a Lambda function.

Invoking the Lambda

The Lambda function can be invoked with the following request.

curl -XPOST http://localhost:8080/2015-03-31/functions/function/invocations -d "{}"

To prettify the results, pipe them into json_pp utility. Use the utf8 option to support non-ascii characters used in emojis.

curl  -XPOST http://localhost:8080/2015-03-31/functions/function/invocations -d {} | json_pp -json_opt pretty,utf8