“Content is not allowed in prolog” error yet nothing before XML declaration
问题 First of all I have already exhaustively checked the following questions and this issue does not seem to be the same thing: SAXParseException: Content is not allowed in prolog org.xml.sax.SAXParseException: Content is not allowed in prolog “Content is not allowed in prolog” when parsing perfectly valid XML on GAE Content is not allowed in Prolog SAXParserException These all seem to boil down to 2 things: There is one or more (possibly invisible) chars before the opening <?xml?> tag. There is