# Start With Linux

## Overview

open-appsec can be deployed as an add-on for NGINX, Kong Gateway or APISIX Gateway to provide protection to any applications and APIs served by NGINX Reverse Proxy, NGINX Webserver, Kong API Gateway or APISIX API Gateway. 

{% tabs %}
{% tab title="NGINX" %}

<figure><img src="/files/A5PMdMLCT550SCWq5Nnc" alt=""><figcaption></figcaption></figure>
{% endtab %}

{% tab title="Kong Gateway" %}

<figure><img src="/files/wccmlFrXEVQxyeG5fMmo" alt=""><figcaption></figcaption></figure>
{% endtab %}

{% tab title="APISIX Gateway" %}

<figure><img src="/files/2eluzKgtAgXlhgnfeOmp" alt=""><figcaption></figcaption></figure>
{% endtab %}
{% endtabs %}

### Proxy vs. locally-served applications

{% hint style="info" %}
The open-appsec agent attaches itself to the traffic being **proxied** by the Proxy Server or API server.
{% endhint %}

If the server serves applications locally, and does not serve as a proxy between an exposed domain and an internal one - open-appsec can still inspect the traffic if you change the port for the local applications to a higher port, and add a proxy rule between the exposed listening domain and port, to the same local machine at a higher port.

{% content-ref url="/pages/ongBhoz9sKZqGzExmUEn" %}
[Install open-appsec for Linux](/getting-started/start-with-linux/install-open-appsec-for-linux.md)
{% endcontent-ref %}


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# Agent Instructions: Querying This Documentation

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

```
GET https://docs.openappsec.io/getting-started/start-with-linux.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.