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Restate services can run in a few ways: as a Node.js HTTP handler, as an AWS Lambda handler, or on other Javascript runtimes like Bun, Deno and Cloudflare Workers.

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Creating a Node.js HTTP handler

Use restate.serve to serve the provided services, starting an HTTP/2 server on port 9080. 
import * as restate from "@restatedev/restate-sdk";
restate.serve({
  services: [myService, myVirtualObject, myWorkflow],
});
If you need to manually control or customize the HTTP2 server, use restate.createEndpointHandler to create a Node HTTP/2 handler, and then use it to manually instantiate the HTTP server:
const http2Handler = restate.createEndpointHandler({
  services: [myService, myVirtualObject, myWorkflow],
});
const httpServer = http2.createServer(http2Handler);
httpServer.listen();

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Creating a Lambda handler

To register your service as a Lambda function, use the /lambda import component and use restate.createEndpointHandler: 
import * as restate from "@restatedev/restate-sdk/lambda";
export const handler = restate.createEndpointHandler({
  services: [myService, myVirtualObject, myWorkflow],
});
The implementation of your services and handlers remains the same for both deployment options. Have a look at the deployment section for guidance on how to deploy your services on AWS Lambda.

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Creating a Deno/Cloudflare Workers handler

Other Javascript runtimes like Deno and Cloudflare Workers have built on top of the Fetch Standard for defining HTTP server handlers. To register your service as a fetch handler, use the /fetch import component. 
import * as restate from "@restatedev/restate-sdk/fetch";
const handler = restate.createEndpointHandler({
  services: [myService, myVirtualObject, myWorkflow],
});
// Cloudflare expects the handler as a default export
export default handler;
// Deno expects to be passed the fetch function
Deno.serve({ port: 9080 }, handler);
By default, a fetch handler will not advertise itself as working bidirectionally; the SDK will end the HTTP request at each suspension point, and the Restate runtime will re-invoke the service when there is more work to do. However, you can use the option bidirectional: true to change this on supported platforms, which will improve latencies once the service is re-registered with the runtime.
  • Deno (including Deno Deploy) supports HTTP2 and therefore bidirectional mode can be enabled.
  • Cloudflare Workers do not support end-to-end HTTP2 or bidirectional HTTP1.1, and enabling bidirectional mode will cause invocations to stall and time out. Services running on Workers must be discovered with the --use-http1.1 CLI flag.
Cloudflare Workers minification is not working correctly with the Restate SDK. If you see an issue similar to:
✘ [ERROR] restate-cloudflare-worker: Uncaught TypeError: Cannot read properties of undefined (reading '__wbindgen_malloc')
Then most likely you have enabled minification when deploying. Disable it with minify = false in your workers.toml file.

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Validating request identity

SDKs can validate that incoming requests come from a particular Restate instance. You can find out more about request identity in the Security docs 
restate.serve({
  services: [myService],
  identityKeys: ["publickeyv1_w7YHemBctH5Ck2nQRQ47iBBqhNHy4FV7t2Usbye2A6f"],
});
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