Port binding

Export services via port binding.

• Web apps are often executed inside webserver containers.
• Apps are completely self-contained and don't rely on runtime injection of a webserver into the execution environment to create client-facing services.
  • Services export their native protocol by binding a port and listening for traffic on it.
• Routing differs:
  • Local development environments just use ports on localhost.
  • Production environments have some kind of API gateway for this.
• This enables one app to be a backing service for another by referencing it in the consuming app's Configuration.

References

• VII. Port binding

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Backlinks

• The Twelve-Factor App (public)