Launching HTTP Server

You can start the HTTP server in the Dymola Behavior Modeling session. The server receives functions calls from the Python or JavaScript Interface.

This task shows you how to:

See Also
Python Interface: Quick Reference
About Python Interface
JavaScript Interface

Launch HTTP Server from User Interface

You can start and stop a HTTP server in Dymola Behavior Modeling, using an interface.

  1. To display the Dymola Http Server dialog box, from the Tools section of the action bar, click Start/Stop Http Server .
    Tip: You can find this command also in the App Options panel, in the System Behavior Options group. To access the App Options panel, from the Tools section of the action bar, select App Options .
  2. Select Python option.

    Note: Select the JavaScript option if you want to use the JavaScript API.

  3. Optional: Specify port number in the Port field.

    Note: The default port numbers for Python and JavaScript are 44000 and 8082 respectively. If the port number is changed, it is saved and displayed as the default port number when the dialog box is reopened.

  4. To start the server, click Start.
    The server is started and configured to listen on the specified port.
  5. To stop the server, click Stop.
    Note: If you close the Dymola Http Server dialog box while the server is running, a new dialog box appears to ask for confirmation. Click Yes to stop the server or No to keep the server running.

Launch HTTP Server from Modelica Scripting Window

You can start and stop a HTTP server in Dymola Behavior Modeling, by executing commands in the Modelica scripting window.

  1. From the Behavior Tools section of the action bar, click Modelica Scripting .
    The Modelica Scripting window appears.
  2. To start the server, run the command: startHttpServer(port=44000).
    The server is started and configured to listen on port 44000.
    Notes: The Dymola Behavior Modeling session allows only a single server to run at any given instant. If a server is already running, any attempt to start a new server will raise the following error:

    Cannot start HTTP server. Another instance is already running.

    = false

    The default port numbers for Python and JavaScript are 44000 and 8082 respectively. If the port number is changed, it is saved and displayed as the default port number when the dialog box is re-opened.

  3. To stop the server, run the command: stopHttpServer().
    Note: If server is not running, any attempt to stop the server will raise the following error:

    Failed to stop HTTP server. Could not find active HTTP server.

    = false