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httpbb (for "HTTP Black Box") is a black-box testing tool for HTTP servers. It reads in a list of test cases, each of which is a specification for an HTTP request followed by one or more assertions about the response. Those requests are played against one or more servers, and the test passes if all the assertions come true.
The code is on Gerrit: https://gerrit.wikimedia.org/r/plugins/gitiles/operations/software/httpbb