0.9,fr-fr

A full header might look like this: Accept-Language: en-US,en;q=0.9,fr-FR;q=0.8 This tells the server: "I prefer US English (1.0), but I'll take any English (0.9) or French from France (0.8) if that's what you have".

In this context, the values indicate a prioritized list of preferences: : This specifies French as spoken in France . 0.9,fr-FR

When a server receives this header, it attempts to match the request with available content: A full header might look like this: Accept-Language:

: Developers use these strings in languages like Python (Flask) or Node.js to automatically redirect users to the correct localized version of a site. Common Example 0.9,fr-FR