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 version of a page to serve: 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 When a web browser sends a request, it
While primarily used in HTTP, this syntax appears in other technical environments: 1. Technical Decomposition
This string is a specific component used in , specifically within the Accept-Language header. It communicates a user's preference for Thai (Thailand) with a weighted "quality" (q-factor) of 0.9 . 1. Technical Decomposition