Ooker•7mo ago

Connection refused when creating a local API server

Ooker · 2024-01-02T14:43:22.255Z

I'm following [Simple API server | Deno Docs](https://docs.deno.com/deploy/tutorials/simple-api "Simple API server | Deno Docs"): 1. Create `server.ts`: ```typescript const kv = await Deno.openKv(); Deno.serve(async (request: Request) => { // Create short links if (request.method == "POST") { const body = await request.text(); const { slug, url } = JSON.parse(body); const result = await kv.set(["links", slug], url); return new Response(JSON.stringify(result)); } // Redirect short links const slug = request.url.split("/").pop() || ""; const url = (await kv.get(["links", slug])).value as string; if (url) { return Response.redirect(url, 301); } else { const m = !slug ? "Please provide a slug." : `Slug "${slug}" not found`; return new Response(m, { status: 404 }); } }); ``` 2. Run `deno run -A --unstable server.ts`. The site says "Please provide a slug" 3. Run: ```PowerShell curl --header "Content-Type: application/json" --request POST --data '{"url":"https://docs.deno.com/runtime/manual","slug":"denodocs"}' http://localhost:8000/ ``` I get this error: ``` curl: (7) Failed to connect to localhost port 8000 after 0 ms: Connection refused ``` [Searching for the error](https://stackoverflow.com/q/35978180/3416774), I think I need to replace `localhost` with `127.0.0.1`: ```PowerShell curl --header "Content-Type: application/json" --request POST --data '{"url":"https://docs.deno.com/runtime/manual","slug":"denodocs"}' http://127.0.0.1:8000/ ``` This doesn't help either. In my understanding, it should return ```json { "ok": true, "versionstamp": "00000000000000060000" } ``` Do you know what goes wrong? ([Also asked on Stack OVerflow](https://stackoverflow.com/q/77746532/3416774))

I'm following Simple API server | Deno Docs: 1. Create server.ts:

const kv = await Deno.openKv();

Deno.serve(async (request: Request) => {
  // Create short links
  if (request.method == "POST") {
    const body = await request.text();
    const { slug, url } = JSON.parse(body);
    const result = await kv.set(["links", slug], url);
    return new Response(JSON.stringify(result));
  }

  // Redirect short links
  const slug = request.url.split("/").pop() || "";
  const url = (await kv.get(["links", slug])).value as string;
  if (url) {
    return Response.redirect(url, 301);
  } else {
    const m = !slug ? "Please provide a slug." : `Slug "${slug}" not found`;
    return new Response(m, { status: 404 });
  }
});

const kv = await Deno.openKv();

Deno.serve(async (request: Request) => {
  // Create short links
  if (request.method == "POST") {
    const body = await request.text();
    const { slug, url } = JSON.parse(body);
    const result = await kv.set(["links", slug], url);
    return new Response(JSON.stringify(result));
  }

  // Redirect short links
  const slug = request.url.split("/").pop() || "";
  const url = (await kv.get(["links", slug])).value as string;
  if (url) {
    return Response.redirect(url, 301);
  } else {
    const m = !slug ? "Please provide a slug." : `Slug "${slug}" not found`;
    return new Response(m, { status: 404 });
  }
});

2. Run deno run -A --unstable server.ts. The site says "Please provide a slug" 3. Run:

curl --header "Content-Type: application/json" --request POST --data '{"url":"https://docs.deno.com/runtime/manual","slug":"denodocs"}' http://localhost:8000/

curl --header "Content-Type: application/json" --request POST --data '{"url":"https://docs.deno.com/runtime/manual","slug":"denodocs"}' http://localhost:8000/

I get this error:

curl: (7) Failed to connect to localhost port 8000 after 0 ms: Connection refused

curl: (7) Failed to connect to localhost port 8000 after 0 ms: Connection refused

Searching for the error, I think I need to replace localhost with 127.0.0.1:

curl --header "Content-Type: application/json"   --request POST   --data '{"url":"https://docs.deno.com/runtime/manual","slug":"denodocs"}'   http://127.0.0.1:8000/

curl --header "Content-Type: application/json"   --request POST   --data '{"url":"https://docs.deno.com/runtime/manual","slug":"denodocs"}'   http://127.0.0.1:8000/

This doesn't help either. In my understanding, it should return

{ "ok": true, "versionstamp": "00000000000000060000" }

{ "ok": true, "versionstamp": "00000000000000060000" }

Do you know what goes wrong? (Also asked on Stack OVerflow)

Simple API server | Deno Docs

Deno is great for creating simple, light-weight API servers. Learn how to create

Stack Overflow

curl (7): Failed to connect to localhost port 8000: Connection refused

Hello I am testing the endpoint and when I run php testing.php I get this error. Any help would be appreciated it. Fatal error: Uncaught exception 'Guzzle\Http\Exception\CurlException' with

Stack Overflow

Connection refused when creating a local API server

I'm following Simple API server | Deno Docs: Create server.ts: const kv = await Deno.openKv(); Deno.serve(async (request: Request) => { // Create short links if (request.method == "P...

4 Replies

marvinh.•7mo ago

I'm unable to reproduce that error on my end. I get the expected response

Ooker•7mo ago

sorry for posting in multiple place do you know how to debug this?

marvinh.•7mo ago

Others might have more knowledge in this area than me. It sounds like a network configuration issue on the machine you're using.

Ooker•7mo ago

hmm, I check again, and this seems that I accidentally used an WSL shell, while launched the server on a normal shell using the normal one returns the data fine