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References

Cheatsheets, syntax references, and quick lookups

ConnectionStrings.com

Connection string syntax reference for every major database.

Interactive cron schedule expression editor and explainer.

HTTP Status Codes

Reference for every HTTP status code with descriptions.

Build, test, and debug regular expressions with live explanations.

Cheatsheets for hundreds of developer tools and languages.

cheatsheetreference

IANA MIME Types

Official IANA registry of all registered MIME media types.