0.9,th-th [PREMIUM]

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

: This identifies the language as Thai ( th ) and the region as ( TH ). 0.9,th-TH

When a web browser sends a request, it might include a header like: Accept-Language: en-US, th-TH;q=0.9 The server analyzes this list to determine which

: 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 A value of 0

: If English isn't available, it serves the Thai version because it has the next highest weight ( q=0.9 ).

: If neither is found, the server provides its own default language. 3. Contextual Variance