Accessing Boxes and Ports

When Codio creates a new project, it will generate a unique subdomain name


where word1 and word2 are randomly generated by Codio.

Configuring Boxes, Web Servers and Services for external access over HTTP and HTTPS

If you are running Apache, Nginx, Node, Ruby etc. and you want to access them externally, you should configure your server/service to listen on a specific port in the normal way.

Codio itself requires a number of ports but we have opened up a large number for your Box. You only need be aware of the restrictions we impose based on whether you are using HTTP or HTTPS.

  • Ports 1024 - 9499 are reserved exclusively for HTTP access.
  • Ports 9500 - 9999 are reserved exclusively for HTTPS access.

SSL access does not require you to install a certificate anywhere as we proxy everything. Just be sure to only use a Port in the 9500 - 9999 range.

Original Request Header

Should you need it, the X_FORWARDED_PROTO header contains original request schema.

Preview Menu

Codio offers a fully customizable Preview menu so you can preview both static files (.html) and server side files (.php files, Ruby and Node apps etc.) with a single click.

This feature lets you set up any number of ‘aliases’ both for static files and Box cli commands.