# \[Alpha] Local feature server

**Warning**: This is an *experimental* feature. It's intended for early testing and feedback, and could change without warnings in future releases.

{% hint style="info" %}
To enable this feature, run**`feast alpha enable python_feature_server`**
{% endhint %}

## Overview

The local feature server is an HTTP endpoint that serves features with JSON I/O. This enables users to get features from Feast using any programming language that can make HTTP requests. A [remote feature server](https://docs.feast.dev/v0.14-branch/reference/alpha-aws-lambda-feature-server) on AWS Lambda is also available. A remote feature server on GCP Cloud Run is currently being developed.

## CLI

There is a new CLI command that starts the server: `feast serve`. By default Feast uses port 6566; the port be overridden by a `--port` flag.

## Example

Here's the local feature server usage example with the local template:

```bash
$ feast init feature_repo
Creating a new Feast repository in /home/tsotne/feast/feature_repo.

$ cd feature_repo

$ feast apply
Registered entity driver_id
Registered feature view driver_hourly_stats
Deploying infrastructure for driver_hourly_stats

$ feast materialize-incremental $(date +%Y-%m-%d)
Materializing 1 feature views to 2021-09-09 17:00:00-07:00 into the sqlite online store.

driver_hourly_stats from 2021-09-09 16:51:08-07:00 to 2021-09-09 17:00:00-07:00:
100%|████████████████████████████████████████████████████████████████| 5/5 [00:00<00:00, 295.24it/s]

$ feast serve
This is an experimental feature. It's intended for early testing and feedback, and could change without warnings in future releases.
INFO:     Started server process [8889]
09/10/2021 10:42:11 AM INFO:Started server process [8889]
INFO:     Waiting for application startup.
09/10/2021 10:42:11 AM INFO:Waiting for application startup.
INFO:     Application startup complete.
09/10/2021 10:42:11 AM INFO:Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:6566 (Press CTRL+C to quit)
09/10/2021 10:42:11 AM INFO:Uvicorn running on http://127.0.0.1:6566 (Press CTRL+C to quit)
```

After the server starts, we can execute cURL commands from another terminal tab:

```bash
$  curl -X POST \
  "http://localhost:6566/get-online-features" \
  -d '{
    "features": [
      "driver_hourly_stats:conv_rate",
      "driver_hourly_stats:acc_rate",
      "driver_hourly_stats:avg_daily_trips"
    ],
    "entities": {
      "driver_id": [1001, 1002, 1003]
    }
  }' | jq
{
  "field_values": [
    {
      "fields": {
        "driver_id": 1001,
        "conv_rate": 0.07427442818880081,
        "avg_daily_trips": 140,
        "acc_rate": 0.8625795245170593
      },
      "statuses": {
        "conv_rate": "PRESENT",
        "acc_rate": "PRESENT",
        "driver_id": "PRESENT",
        "avg_daily_trips": "PRESENT"
      }
    },
    {
      "fields": {
        "avg_daily_trips": 646,
        "acc_rate": 0.8026317954063416,
        "conv_rate": 0.41487279534339905,
        "driver_id": 1002
      },
      "statuses": {
        "driver_id": "PRESENT",
        "avg_daily_trips": "PRESENT",
        "conv_rate": "PRESENT",
        "acc_rate": "PRESENT"
      }
    },
    {
      "fields": {
        "avg_daily_trips": 671,
        "conv_rate": 0.4033895432949066,
        "driver_id": 1003,
        "acc_rate": 0.06059994176030159
      },
      "statuses": {
        "driver_id": "PRESENT",
        "conv_rate": "PRESENT",
        "avg_daily_trips": "PRESENT",
        "acc_rate": "PRESENT"
      }
    }
  ]
}
```

It's also possible to specify a feature service name instead of the list of features:

```
curl -X POST \
  "http://localhost:6566/get-online-features" \
  -d '{
    "feature_service": <feature-service-name>,
    "entities": {
      "driver_id": [1001, 1002, 1003]
    }
  }' | jq
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.feast.dev/v0.14-branch/reference/feature-server.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.