This problem is only applicable to a few instances of our Spring Boot server in one environment. A server is running several instances in three different environments(DEV/TEST/PROD). The following situation works fine in DEV and PROD, as well as locally. It does not work in TEST.

Search for usernames with a '+' in the end are not being properly decoded by our server. There is a search request being made by an axios GET call in the frontend, as so:

Search parameter: username+

The GET request would look like this: https://tst.blackrock.com/atmosportal/api/search?search=username%2B

In all other environments, our Spring Boot controller is able to decode the request parameter %2B into a + out of the box. So the service would search for username+ as expected. However, in our TEST environment, it searches for username%2B.

Any idea why this might be happening?