Uploaded file in django doesn't have RIFF id

I upload .wav file to django, and problem is that lib wave from
python, can't open it 'cause it doesnt have RIFF id. I made this test:

print request.FILES['file'].read(20)
f = open('C:/audio_test/Cricket.wav')
print f.read(20)
validation, error = sa.validation(request.FILES['file'])

I print first 20 bytes of uploaded file, and then 20 bytes of file
directly from hdd.

Output:

♠ WAVEfmt ↕ ☺ ☺ DČ
RIFF~╚♠ WAVEfmt ↕

As we can see django loses first 6 bytes of file somewhere. I dont
know why, and I cant make wave lib works without it.

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