URL that outputs response with two Set-Cookie headers: https://httpbin.org/response-headers?Set-Cookie=a&Set-Cookie=b See also bug 1608979 for another test case.
Bug 1608979 Comment 5 Edit History
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URL that outputs response with two Set-Cookie headers: https://httpbin.org/response-headers?Set-Cookie=a&Set-Cookie=b See also bug 1808069 for another test case.