0.9,th-th -

The string breaks down into two distinct parts defined by the HTTP/1.1 specification :

: The server looks for a version in US English ( q=1.0 by default). 0.9,th-TH

: Often written as q=0.9 , this is a Relative Quality Factor . It ranks user preferences on a scale from 0.0 to 1.0. A value of 0.9 indicates it is a secondary preference if a primary language (defaulting to q=1.0 ) is unavailable. 2. Practical Application: How Servers Use It The string breaks down into two distinct parts

Are you looking to or analyze its impact on SEO and localized content delivery ? 0.9,th-TH

The server analyzes this list to determine which version of a page to serve: