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HTTP errors are correctly counted to compute the mobileOK score and appear in the repartition of failures per severity summary (medium or severe failures depending on the error). But they do not appear in the repartition of failures per category, and do not appear in the detailed report.
The bug was created when moving to new categories. The definition of the "HTTP" category in parameters.xsl contained bad references to the HTTP failure messages. Note that there is no proper icon for the HTTP category. The "danger" icon is being used.