0.9,es-419 Apr 2026

: This is a "q-factor" (quality value) used in HTTP content negotiation. It tells a server that if the user's primary language isn't available, this variant is the next best choice, with a weight of 0.9 on a scale of 0 to 1. Use in Software & Web

This string refers to an frequently found in HTTP Accept-Language headers . It indicates a preference for Latin American Spanish . Core Components es : The ISO 639-1 code for the Spanish language. 0.9,es-419

: The UN M.49 regional code for Latin America and the Caribbean . : This is a "q-factor" (quality value) used