This line tells you the difference:

> let $content := file:read-text($fName, "cp1251")

You are reading the file contents as text (i.e., string). You could
also use file:read-binary. Using the browser, you can also upload
images or other binary contents.

> let $csv := csv:parse($content, map{ 'separator': ';', 'header': false() } )
> return $csv
>
> What the difference between post data and raw file?
>
>
> On Sun, Jun 12, 2016 at 11:45 PM, Alexander Shpack <shadowkin@gmail.com>
> wrote:
>>
>> Did you always upload the same file?
>>
>> Yeah
>>
>>>
>>> As the error indicates, it seems that your CSV input seems to contain
>>> characters that are not valid in XML. There are various ways to tackle
>>> this; one looks as follows:
>>>
>>>  (: interpret client data as Base64 :)
>>>  declare
>>>     %rest:path("/upload")
>>>     %rest:POST("{$body}")
>>>     function local:store-csv($body as xs:base64Binary)
>>>   {
>>>     (: replace invalid characters with a question mark :)
>>>     let $input := bin:from-octets(
>>>       bin:to-octets($body) ! (if(. >= 32 or . = (9, 10, 13)) then . else
>>> 63)
>>>     )
>>>     (: convert to XQuery Unicode string; convert to XML :)
>>>     let $string := bin:decode-string($input, 'CP1251')
>>>     return csv:parse($string)
>>>   };
>>>
>>> There may be easier solutions as well (I’ll give you an update once I
>>> remember them ;).
>>
>>
>> Strange solution... Ok, I'll wait for a better one.
>>
>> --
>> s0rr0w
>
>
>
>
> --
> s0rr0w