When should you prefer PSGI/Plack, and when should you avoid it?

### When to Prefer PSGI/Plack:

• Modularity: If you need a system that allows you to use middleware components interchangeably with minimal configuration, PSGI/Plack is a great choice.
• Integration: It provides seamless integration with various web servers and the ability to run on different platforms.
• Testing: PSGI/Plack offers an easy way to set up tests and mock servers, which is beneficial during the development process.
• Rich Ecosystem: Use PSGI/Plack if you want to take advantage of a rich ecosystem of libraries and middleware for various functionalities.

### When to Avoid PSGI/Plack:

• Simple Applications: If you are building a simple application with minimal requirements, using PSGI/Plack might add unnecessary complexity.
• Performance Constraints: In situations where performance is critical, and every millisecond matters, lighter frameworks or raw CGI might be preferred.
• Steep Learning Curve: For beginners or teams unfamiliar with PSGI/Plack, the learning curve might slow down development.

# Example of a simple PSGI application
my $app = sub {
    my $env = shift;
    return [200, ['Content-Type' => 'text/plain'], ["Hello, PSGI World!"]];
};

# To run the app with Plack
# plackup -r script.psgi