Cloudflare Developers•9mo ago

TCP Socket does not seem to work on Worker

I have created a new worker using the example on https://developers.cloudflare.com/workers/runtime-apis/tcp-sockets/#connect (also below), under https://connect.fifo.workers.dev When trying to access https://connect.fifo.workers.dev/gopher/wbgopher, it takes a long time and just returns a blank page. It seems to stuck at responding with the ReadableStream from socket. Code from the example:

import { connect } from 'cloudflare:sockets';

export default {
  async fetch(req: Request) {
    const gopherAddr = { hostname: "gopher.floodgap.com", port: 70 };
    const url = new URL(req.url);

    try {
      const socket = connect(gopherAddr);

      const writer = socket.writable.getWriter()
      const encoder = new TextEncoder();
      const encoded = encoder.encode(url.pathname + "\r\n");
      await writer.write(encoded);

      return new Response(socket.readable, { headers: { "Content-Type": "text/plain" } });
    } catch (error) {
      return new Response("Socket connection failed: " + error, { status: 500 });
    }
  }
};

import { connect } from 'cloudflare:sockets';

export default {
  async fetch(req: Request) {
    const gopherAddr = { hostname: "gopher.floodgap.com", port: 70 };
    const url = new URL(req.url);

    try {
      const socket = connect(gopherAddr);

      const writer = socket.writable.getWriter()
      const encoder = new TextEncoder();
      const encoded = encoder.encode(url.pathname + "\r\n");
      await writer.write(encoded);

      return new Response(socket.readable, { headers: { "Content-Type": "text/plain" } });
    } catch (error) {
      return new Response("Socket connection failed: " + error, { status: 500 });
    }
  }
};

Cloudflare Docs

TCP sockets · Cloudflare Workers docs

Use the connect() API to create outbound TCP connections from Workers.

2 Replies

Walshy•9mo ago

Code?

EsenteOP•9mo ago

The same example code on the TCP sockets page:

import { connect } from 'cloudflare:sockets';

export default {
  async fetch(req: Request) {
    const gopherAddr = { hostname: "gopher.floodgap.com", port: 70 };
    const url = new URL(req.url);

    try {
      const socket = connect(gopherAddr);

      const writer = socket.writable.getWriter()
      const encoder = new TextEncoder();
      const encoded = encoder.encode(url.pathname + "\r\n");
      await writer.write(encoded);

      return new Response(socket.readable, { headers: { "Content-Type": "text/plain" } });
    } catch (error) {
      return new Response("Socket connection failed: " + error, { status: 500 });
    }
  }
};

import { connect } from 'cloudflare:sockets';

export default {
  async fetch(req: Request) {
    const gopherAddr = { hostname: "gopher.floodgap.com", port: 70 };
    const url = new URL(req.url);

    try {
      const socket = connect(gopherAddr);

      const writer = socket.writable.getWriter()
      const encoder = new TextEncoder();
      const encoded = encoder.encode(url.pathname + "\r\n");
      await writer.write(encoded);

      return new Response(socket.readable, { headers: { "Content-Type": "text/plain" } });
    } catch (error) {
      return new Response("Socket connection failed: " + error, { status: 500 });
    }
  }
};

Just a small update. I was able to open https://connect.fifo.workers.dev/gopher/wbgopher from clicking the link in this thread, and see the response text. However, when I refresh the link, the same issue happens. Still does not work.

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TCP Socket does not seem to work on Worker