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The Orion Context Broker is a great piece of software for managing context information. Using the RESTful API provided from a web browser is easy and can also be simplified by the use of some library (e.g. ngsijs). However, there is a limitation, Orion uses POST request for sending notifications. This notification mechanism makes imposible to directly receive them on a web page. This NGSI proxy creates a server that is capable of receiving POST notifications and redirect them to web pages through an Event Source endpoint.


You can install the latest stable version of the ngsi-proxy by issuing the followign command:

$ npm install -g ngsi-proxy

Once installed, you will be able to run the ngsi-proxy server by directly using the ngsi-proxy command. By default, it will be listening on port 3000, but you can change it by setting the PORT environment variable:

$ PORT=10000 ngsi-proxy

ngsi-proxy will ignore X-Forwarded-* headers by default. If you need to deploy ngsi-proxy behind a front-end web server, like Apache or Nginx, you can enable those headers by setting the TRUST_PROXY_HEADERS environment variable:

$ TRUST_PROXY_HEADERS=1 ngsi-proxy

You can use a process manager (e.g. pm2) for running ngsi-proxy in a production environment:

$ npm install -g pm2
$ pm2 startup
$ pm2 start ngsi-proxy
$ pm2 save

Take a look into the pm2's documentation for a full list of options.

Running using docker

ngsi-proxy can also be deployed using a docker container. Take a look into the docker image documentation.

Running from source code

If you want to test the latest development version of the ngsi-proxy you will have to download the git repo by issuing the following command:

$ git clone

Once downloaded, you have to install some dependencies:

$ cd ngsi-proxy
$ npm install

Finally, you will be able to manually run the ngsi-proxy service:

$ node app.js


Proxy allowing receiving notifications from Orion Context Broker on browser environments





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