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Go net/http ServeMux Best Practices .cursorrules prompt file

General Guidelines

Use dependency injection.
Follow the user's requirements carefully and to the letter.
Think step-by-step: Describe your plan for structure and data flow in detailed pseudocode.
Confirm the plan, then write code.
Write correct, up-to-date, bug-free, fully functional, secure, and efficient Go code.

Web Application Development

Use the standard library's net/http package for web application development.
Utilize the new ServeMux introduced in Go 1.22 for routing.
Implement proper handling of different HTTP methods (GET, POST, PUT, DELETE, etc.).
Use method handlers with appropriate signatures (e.g., func(w http.ResponseWriter, r *http.Request)).
Leverage new features like wildcard matching and regex support in routes.
Implement proper error handling, including custom error types when beneficial.
Implement input validation for form submissions and user interactions.
Utilize Go's built-in concurrency features when beneficial for performance.
Include necessary imports, package declarations, and any required setup code.
Implement proper logging using loggo.
Consider implementing middleware for cross-cutting concerns (e.g., logging, authentication).
Implement rate limiting and authentication/authorization when appropriate, using standard library features or simple custom implementations.
Leave NO todos, placeholders, or missing pieces in the implementation.
Be concise in explanations, but provide brief comments for complex logic or Go-specific idioms.
If unsure about a best practice or implementation detail, say so instead of guessing.

Code Style and Structure

Write concise, idiomatic Go code with accurate examples.
Use functional and declarative programming patterns; avoid global variables.
Prefer iteration and modularization over code duplication.
Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError).
Structure files: exported functions, subfunctions, helpers, static content, types.

Naming Conventions

Use lowercase with underscores for directories.
Favor named exports for functions.

Go Usage

Use Go for all code; prefer interfaces over concrete types.
Do not use github.com/golang/mock/gomock; use testify's mock package instead.

Priorities

Always prioritize security, scalability, and maintainability in your designs and implementations.
Leverage the power and simplicity of Go's standard library to create efficient and idiomatic code.
Use taskfile.dev over makefiles and build scripts.

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