[Bug]: parameters-extractor middleware is subject to race conditions

[guillaumerochelle]

Package name

dynamic-content

Package version

11.3.0-rc.8

Reproduction steps

It's kinda hard to reproduce. We faced the issue running our e2e tests with multiple threads.

Basically we launch an express server with the middleware.
The e2e campaign shoots multiple POST requests at the same time (due to multiple threads).

Current result

Some requests get the post params from other requests. This is due to post params being saved in a global object here.
See here: let previousPostParams = {};

The next Content-Type: text/html request which arrives on the express server will have data-post attribute in the body tag populated with the post params.

Expected result

Refactor the middleware to not be subject to race conditions.

Additional comments

No response