fix: return proper status codes for invalid/non-existent chatflow IDs

[aibysid]

• Add UUID validation to return 400 for invalid ID format
• Preserve InternalFlowiseError status codes (404 for not found)
• Fix error handling to prevent wrapping all errors as 500

Fixes #5379

[gemini-code-assist[bot]]

Summary of Changes

Hello @aibysid, I'm Gemini Code Assist[^1]! 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 refines the error handling mechanism for retrieving chatflows by ID. It introduces validation for the UUID format of chatflow IDs, ensuring that requests with malformed IDs receive an appropriate 400 status. Additionally, it enhances the error propagation to correctly preserve specific error codes like 404 for non-existent chatflows, thereby providing more accurate feedback to the client and preventing generic 500 errors for client-side issues.

Highlights

• UUID Validation: Implemented UUID format validation for chatflow IDs, returning a 400 Bad Request status for invalid ID formats.
• Error Code Preservation: Ensured that existing InternalFlowiseError status codes, such as 404 for not found, are preserved and re-thrown, rather than being wrapped as generic 500 errors.
• Refined Error Handling: Improved the error handling logic to prevent all errors from being caught and re-thrown as 500 Internal Server Errors, allowing more specific error responses.

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[salimzdn]

I would add that this error also happens for many APIs and not only for the chatflow API, a more global fix could be applied

[aibysid]

I would add that this error also happens for many APIs and not only for the chatflow API, a more global fix could be applied

Agreed will plan on doing it with next commit.