CGI · Modernization
Insights
How to modernize an old Perl CGI application.
A practical modernization path for old Perl CGI applications: reproduce the environment, protect behaviour, improve security and migrate only when it solves a real problem.
Maple · Mecha · Perl
01
Reproduce the environment
Before changing architecture, make the current application installable and runnable in a controlled environment. Capture the Perl version, dependencies, web-server assumptions and configuration.
02
Separate request plumbing from business logic
A thin CGI executable is easier to reason about. Move reusable logic into modules so it can be called from tests and, later, from another request boundary if needed.
03
Protect security-sensitive paths
Review parameters, uploads, output encoding, session state, file paths, headers, database queries and error handling before chasing architectural elegance.
04
Add characterization tests
Use tests to capture what the existing system does at critical boundaries. The first goal is confidence during change, not a coverage percentage.
05
Decide whether PSGI earns the migration
PSGI can provide middleware, persistent application processes and deployment flexibility. Those benefits matter only if they solve a real operational or development constraint.
06
A practical next step
Choose one user flow, reproduce it outside production, characterize its behaviour and extract the smallest useful module boundary. That creates leverage without committing to a rewrite.
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