fixRequestBody does not handle Content-Type text/plain, even though bodyParser.text exists

[knudtty]

Checks

• I understand project setup issues should be asked on StackOverflow or in GitHub Discussions.
• I updated to latest http-proxy-middleware.

Describe the bug (be clear and concise)

fixRequestBody is supposed to "Fix proxied body if bodyParser is involved", so it should handle all cases of bodyParser. One of those is bodyParser.text, which handles requests with content-type of text/plain. There is currently no case that handles that, so one should be added.

Step-by-step reproduction instructions

1. ...
2. ...

Expected behavior (be clear and concise)

fixRequestBody should write to the request body for Content-Type text/plain.

How is http-proxy-middleware used in your project?

Forwarding requests for an /api route to a separate running api

What http-proxy-middleware configuration are you using?

version 3.0.3

What OS/version and node/version are you seeing the problem?

N/A

Additional context (optional)

No response