Test case sessions are stored internally in Fiddler .saz format. A session .saz file is a part of the test. It can be used with comparable programs.
Additionally, test case sessions can be exported as an HTTP archive (.har).
Info: HAR format is owned by W3C (see HTTP Archive (HAR) format). It is adopted by all major web browsers and many web metering and performance tools, listed here.
To save test case sessions as an HTTP archive, in Managing Test Case(s) section, right-click a test case and select Export Test Case.
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