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Whether to ignore the trailing white space is completely inside PHP engine, LSAPI has no control over it, like you said, it might be controled by a configuration in php.ini. You have to use the same php.ini when you compare the output of FCGI PHP and LSAPI PHP. Just use command line option "-c <path_to_ini_dir>".
If the error messages were not sent to STDERR stream, then it will be interpreted as the headers as well, otherwise, errors will show up in our error.log.
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