Reference
Cheat sheets and lookup tables.
HTTP Status Codes
Every HTTP status code from 100 to 511 with its name, what it means and when to use it (200, 201, 301, 404, 429, 502...). Searchable and free.
MIME Types Lookup
Find the MIME type (Content-Type) for any file extension, or the extensions of a MIME type. Common types and the full IANA-based list, searchable and free.
CSP Builder
Build a Content-Security-Policy header with checkboxes, or paste a policy to find unsafe-inline, wildcards and missing object-src or base-uri. Runs in your browser.
.gitignore Generator
Generate a .gitignore by combining templates for Laravel, Node, Python, Java, Go, macOS, Windows, JetBrains and VS Code. Free, runs in your browser.