OWIN, WCF, EXPRESS-JS, KOA, etc.
IOPA will feel familiar to those coming from HTTP frameworks such as WCF, Express or Koa with the well-defined
app.use() pattern to build application pipelines. However, IOPA takes these a step further and allows the very same middleware and applications to now server other protocols such as CoAP, MQTT, UPNP etc. without change.
Published as open-source without dependence on any implementation or platform, the IOPA specs allow applications to be developed independently of the actual server (nGinX, IIS, Node.js, Katana, node-coap, iopa-mqtt, iopa-coap, iopa-http, etc.).
The pattern and reference implementation is particularly well-suited for Serverless cloud infrastructures such as AWS Lambda, Azure Functions, Google Cloud Functions and IBM OpenWhisk. This is because each of these come with their own proprietary invocation patterns, but all essentially run micro-services that start based on well-defined trigger events. Abstracting these events into a common format allows developers to create a common micro-service that runs without change in each of these environments, and means investments in common utility functions like authentication, authorization, logging, app analytics, etc. can all be done with the knowledge that these will likely work across platforms and even be reused for web, mobile etc.
The pattern and reference implementation is particularly well-suited for Bot APIs such as Facebook Messenger, Amazon Alexa Skills, Microsoft Bot Framework, Google Now, and Whatsapp. This is because each of these come with their own proprietary invocation patterns, but all essentially run micro-services that start based on conversational intent events. Abstracting these events into a common format allows developers to create a common micro-service that runs without change in each of these environments.
Because it is a well-defined pattern that uses only base language features it is not even necessary to include this repository in any microservices that rely on it. The entire pattern works using well-known string constants (published in the open-source IOPA specification). However, inclusion of this repository gives access to intellisense, constant optimization, etc.
A broad ecosystem of servers and middleware, such as routers and view engines, exist in the the [iopa-io](https://github.com/iopa-io] organization on GitHub. We encourage any other middleware or implementations to be shared on GitHub with a name that starts
iopa- as we will highlight active valued projects here.