Found the following HTML validation problems:
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Response.html:1196:1 (Response.Rd:791): Warning: <h5> anchor "Arguments" already defined
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Response.html:1276:1 (Response.Rd:841): Warning: <h5> anchor "Arguments" already defined
abort_http_problem.html:192:1 (abort_http_problem.Rd:140): Warning: missing </ul> before </div>