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# Adding a Web Server to Your Sim

If Trick is [configured with Civetweb](Configure-Civetweb.md),
adding a web server to your simulation simply requires including the CivetServer sim module into your **S_define** file:

```
#include "sim_objects/CivetServer.sm"
```

## Configuration of the Web Server

The following (`input.py`) parameters are available to configure your web server:   

|Parameter Name             | Default Value             | Description                                                       |
|---------------------------|---------------------------|-------------------------------------------------------------------|
|web.server.enable          | `False`                   |Must be explicitly enabled                                         |
|web.server.port            | `8888`                    |Web servers “listen” port                                          |
|web.server.document_root   | `"www"`                   |Web servers document root                                          |
|web.server.debug           | `False`                   |Print Client/Server Communication.                                 |
|web.server.ssl_enable      | `False`                   |Encrypt traffic. Uses https instead of http.                       |
|web.server.path_to_ssl_cert|`"~/.ssl/server.pem"`      |Path to your certificate.  This is only used if `ssl_enable = True`|
|web.server.error_log_file  |`"civet_server_error.log"` |CivetWeb error log file.                                           |

For your web server to be active, you must at least specify the following :   

```python
web.server.enable = True

```

To have your web server listen on port `8890`, rather than `8888`, you would specify:   

```python
web.server.port = 8890
```

To serve files from a directory called ```my_document_root```, rather than ```www```:

```python
web.server.document_root = "my_document_root"
```

To see client/server communication:

```python
web.server.debug = True
```

## When the Web Server Starts
The web server, if enabled, will start during sim initialization. When it does, it will look for the specified document root directory. By default that’s `“www”`. If root directory doesn’t exist, one will be created with a simple `index.html` file , a style sheet, and a couple of directories. 


## Connecting to Your Web Server
Assuming that you accepted the default port, connect to ```http://localhost:8888/``` (```https://localhost:8888/``` if `ssl_enable=True`) from your web browser. This will display the `index.html` file in your root directory.


## The Default Document Root Directory

The default document root directory that was initially created for you is minimal.

```
www/
    index.html
    style.css
    apps/
    images/
```

**index.html** is the file that’s displayed when you connect to `http://localhost:8888/`.

**style.css** is a CSS style-sheet that’s included by index.html to give it some pizzazz. 

The **apps** directory contains links to some example html/javascript applications
 in ```$TRICK_HOME/trick_source/web/apps```.

The **images** directory contains trick_icon.png.

**You are encouraged to add to, modify, and/or delete these files and directories to best suite the needs of your project.**

Continue to [Configuring Trick with Civetweb](Configure-Civetweb)