Environment (Required on creation):

• 7.16
• External Task Client JS 2.1

Description (Required on creation; please attach any relevant screenshots, stacktraces, log files, etc. to the ticket):

Loading variables of type file is broken.

Steps to reproduce (Required on creation):

• Have a process with an External Task deployed
• Start a process instance and add a variable of type file with name foo and value bar
• Try to load the file in the XTaC JS:

  client.subscribe("data", async function ({task}) {
    const { textAttachment } = task.variables.getAll();
    console.log((await textAttachment.load()).content.toString("utf-8"));
  });

Observed Behavior (Required on creation):

Nothing is shown as output.

Expected behavior (Required on creation):

Nothing bar is shown as output.

Root Cause (Required on prioritization):

The client assumes to retrieve base64 string wrapped in a JSON object when loading files. However, the endpoint GET /execution/{id}/localVariables/{varName}/data is used which returns application/octet-stream.