har is the HTTP Archive format that can be used by HTTP monitoring tools to export collected data.
har, the HTTP Archive format, is adopted by browsers and tools to persist network analysis data captured (collected) monitoring the page activity (i.e. to see what resources a web page is using, bandwidth and cache usage, and so on). har files (HTTP tracing logs) can be processed by specific statistical software or visualized by tools such as for example harviewer. See also the HAR 1.2 Specification
