More complex APIs: Multiple endpoints with plumber
==================================================

To specify multiple end-points in your plumber API, you simply need to decorate
multiple functions with routing comments. An example from the plumber
documentation is the following, which allows you to ``GET`` an estimate of the
mean of the normal distribution given a sample size, and ``POST`` two numbers
(``a`` and ``b``) and receive back the sum.

The source code for this API is:

.. literalinclude:: plumber_basic_example_myapi.R

Once you have configured your API in Faculty (see :ref:`plumber`), you can
query your API from the command line of your development server:

.. code-block:: bash

  curl localhost:8000/mean

We can pass parameters in our API call, as well:

.. code-block:: bash

  curl "localhost/mean?samples=10000"

And we can query our second endpoint:

.. code-block:: bash

  curl \
    -H "Content-Type: application/json" \
    --data '{"b": 3, "a": 5}' \
    localhost:8000/sum