huynh
Programming WebRTC: How to configure CORS for the signaling server
I want to run the signaling server and the front-end (e.g., basic_p2p app) on separate ports.
From the client side, I get this “CORS missing allow origin” when connecting to the server.
How to solve that issue?
What I tried so far (and that didn’t work):
// server.js
const cors = require("cors");
const app = express();
app.use(cors());
Marked As Solved
karlstolley
Hi Huynh!
There’s a couple of ways to handle this. One would be to worry about CORS only on the socket server. Have a look at Socket.io docs at Handling CORS | Socket.IO
Or, to continue your method of working directly with Express, have a close look at their documentation, including Express cors middleware
If you’re not yet skilled with using a tool like curl, that will help you determine the headers coming back from both your app and signaling servers, and help you figure out where additional adjustments or configuration is needed.
Popular Pragmatic Bookshelf topics
Modern front-end development for Rails, second edition - Struggling to get the first chapter to work
Other popular topics
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /clojure
- /java
- /emacs
- /haskell
- /svelte
- /typescript
- /onivim
- /kotlin
- /c-plus-plus
- /crystal
- /tailwind
- /react
- /gleam
- /ocaml
- /flutter
- /elm
- /vscode
- /ash
- /html
- /opensuse
- /zig
- /centos
- /deepseek
- /php
- /scala
- /react-native
- /lisp
- /textmate
- /sublime-text
- /nixos
- /debian
- /agda
- /django
- /deno
- /kubuntu
- /arch-linux
- /nodejs
- /revery
- /ubuntu
- /spring
- /manjaro
- /lua
- /julia
- /diversity
- /markdown
- /slackware
Devtalk Sponsors
Practical resources that improve the lives of professional developers.
We build trusted fault-tolerant systems that scale to billions of users.
Real-time error tracking, performance insights, and observability for devs.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Develop your skills with books, videos, and courses.
Catch errors, track performance, monitor hosts and more.
Enabling companies to succeed by building software people love.
Courses that move you from confusion to "Aha, now I get it!"
Publishing Linux Magazine, ADMIN, and MakerSpace for 25+ years.