This content has been automatically translated from Ukrainian.
Quality values (qualitative values /priority) are numerical values used in HTTP headers to determine the relative quality or priority of response options. In HTTP, they are often used in headers such as Accept and Content-Type. Quality values are in the range from 0 to 1, where 1 represents the highest quality (priority) and 0 the lowest.
For example, in the Accept header, you can specify different types of media along with their quality values to indicate which types the client prioritizes more.
For example, Accept: text/html;q=0.9, application/json;q=0.8 shows that the client is more inclined to accept HTML than JSON, because the quality value for HTML (0.9) is higher than for JSON (0.8).
Quality values allow you to set the order of priorities in the list of options and help clients and servers interact by choosing the most suitable answer options depending on their conditions.
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