0.9,fr-fr Apr 2026

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

: 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

: If fr-FR is not available, it may look for a general French version ( fr ) or the next language in the user's priority list. In this context, the values indicate a prioritized

: If the server has a French (France) version of the page, it will serve that. : If the server has a French (France)

When a server receives this header, it attempts to match the request with available content:

The string "0.9,fr-FR" is typically a segment of an , which tells a web server which languages a user prefers for the content they receive. Understanding the Syntax

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".