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When using the validator API to Post site contents HTML encoded strings seem to get unencoded before parsed i.e. if I have the following in a site header: <link href="http://fonts.googleapis.com/css?family=Source+Sans+Pro" rel="stylesheet" type="text/css" /> The + signs appear to be getting stripped before the page contents are validated. This causes false validation errors to be reported. If I submit the site as a URL directly no problem occurs.