"stream" in put vs request.FILES['file']

[Kishor Pawar]

So I wanted to write a custom file upload parser as specified in docs. 

According to doc I implemented the "parse" method as 

----------------------------488071469102781097692083 Content-Disposition: form-data; name="file"; filename="email_test.msg" Content-Type: application/vnd.ms-outlook < actual content here > ----------------------------488071469102781097692083--

class MailParser(BaseParser):
    """
        parses email serialized data
    """


    media_type = "multipart/form-data"


    def parse(self, stream, media_type = None, parser_context = None):
        """ Here I was trying to read stream """

but when I tried to read stream it additionally had following content

    ----------------------------488071469102781097692083
    Content-Disposition: form-data; name="file"; filename="email_test.msg"
    Content-Type: application/vnd.ms-outlook  

   < actual content here >

    ----------------------------488071469102781097692083--

But when I directly read the file from request using 

request.FILES['file'] .read()

The same content wasn't there.

I wanted to understand this behaviour.

Thanks in advance.