Replace cgi.FieldStorage with email/urllib for form parsing

[doomedraven]

Refactors MiniHTTPRequestHandler to use the email and urllib modules for parsing multipart/form-data and application/x-www-form-urlencoded requests, replacing the deprecated cgi.FieldStorage. This improves compatibility with newer Python versions and handles file uploads and form fields more robustly. Also updates server shutdown logic to use the shutdown() method.

[gemini-code-assist]

Summary of Changes

Hello @doomedraven, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request modernizes the MiniHTTPRequestHandler by replacing the outdated cgi.FieldStorage module with a more robust implementation using Python's email and urllib libraries for parsing HTTP form data. This change ensures better compatibility with current Python versions and enhances the handling of various form content types, including file uploads. Additionally, the server's shutdown procedure has been refined to use a more appropriate method.

Highlights

• Deprecated Module Replacement: The cgi.FieldStorage module, which is deprecated, has been replaced with a custom parsing logic utilizing Python's email.parser and urllib.parse modules for handling HTTP form data.
• Enhanced Form Data Parsing: The MiniHTTPRequestHandler now robustly parses multipart/form-data and application/x-www-form-urlencoded requests, improving compatibility and handling of file uploads and form fields.
• Server Shutdown Logic Update: The server shutdown mechanism has been updated to use the shutdown() method on the server instance, providing a more standard and reliable way to terminate the server.

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[gemini-code-assist]

Code Review

This pull request is a great improvement, replacing the deprecated cgi module with modern alternatives (email and urllib) for form parsing. The implementation is largely solid. However, I've identified a critical issue in the updated server shutdown logic that will cause a deadlock, preventing the agent from shutting down properly. I've also included several suggestions to enhance the robustness and maintainability of the new form parsing code. Please prioritize fixing the shutdown mechanism.

[gemini-code-assist]

When parsing application/x-www-form-urlencoded data, the code takes only the first value for a given key (val[0]). This can lead to silent data loss if a client sends multiple values for the same form field (e.g., from multiple checkboxes with the same name). While the previous cgi implementation was also buggy in this scenario, and current agent functionality may not rely on multiple values, it's a potential issue for future compatibility. The current implementation is a reasonable choice to avoid breaking consumers of request.form that expect a single string, but this limitation is worth noting.