Durable Object Base Class

The DurableObject base class is an abstract class which all Durable Objects inherit from. This base class provides a set of optional methods, frequently referred to as handler methods, which can respond to events, for example a webSocketMessage when using the WebSocket Hibernation API. To provide a concrete example, here is a Durable Object MyDurableObject which extends DurableObject and implements the fetch handler to return "Hello, World!" to the calling Worker.

export class MyDurableObject extends DurableObject {
	constructor(ctx, env) {
		super(ctx, env);
	}

	async fetch(request) {
		return new Response("Hello, World!");
	}
}

export class MyDurableObject extends DurableObject {
	constructor(ctx: DurableObjectState, env: Env) {
		super(ctx, env);
	}

    async fetch(request: Request) {
    	return new Response("Hello, World!");
    }

}

from workers import DurableObject, Response

class MyDurableObject(DurableObject):
	def __init__(self, ctx, env):
		super().__init__(ctx, env)

	async def fetch(self, request):
		return Response("Hello, World!")

• fetch(request Request) : Response | Promise<Response>- Takes an HTTP Request ↗ and returns an HTTP Response ↗. This method allows the Durable Object to emulate an HTTP server where a Worker with a binding to that object is the client. - This method can be async.
  • Durable Objects support RPC calls as of compatibility date 2024-04-03. RPC methods are preferred over fetch() when your application does not follow HTTP request/response flow.

• request Request - the incoming HTTP request object.

• A Response or Promise<Response>.

export class MyDurableObject extends DurableObject {
	async fetch(request) {
		const url = new URL(request.url);
		if (url.pathname === "/hello") {
			return new Response("Hello, World!");
		}
		return new Response("Not found", { status: 404 });
	}
}

export class MyDurableObject extends DurableObject<Env> {
	async fetch(request: Request): Promise<Response> {
		const url = new URL(request.url);
		if (url.pathname === "/hello") {
			return new Response("Hello, World!");