Fix: Ensure MultipartForm is properly restored to the original request

[fanyiboaa]

What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update
• Go Version Update
• Dependency Update

Description

This PR fixes an issue related to the shallow copy of the HTTP request (req), which prevents the proper cleanup of temporary files created by MultipartForm. The shallow copy causes req.MultipartForm to be modified without reflecting these changes back to the original request (originReq), leading to the failure to release temporary files.

To resolve this, a deferred function has been added to ensure that req.MultipartForm is correctly restored to originReq at the end of the request handling. This will allow the net/http server to properly release any temporary files associated with the MultipartForm.

The code for releasing temporary files is located at server.go line 1726 in the net/http package.

Related Tickets & Documents

• This PR addresses the issue without a specific related issue number.

Added/updated tests?

• Yes
• No, and this is why: please replace this line with details on why tests
  have not been included
• I need help with writing tests

Run verifications and test

• make verify is passing
• make test is passing

[fanyiboaa]

Defer copying req.MultipartForm onto the captured *http.Request on exit covers the case where req gets reassigned after matching. nit: the comment block is longer than the code—one line on shallow copy is plenty.

Thanks for the point! I've simplified the comment to keep it concise.