Код:
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Content-Disposition: form-data; name="utf8"
✓
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Content-Disposition: form-data; name="_method"
put
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Content-Disposition: form-data; name="authenticity_token"
H93Ij5wdYw4sB8LFLA5Rr2k/is1rkr2r2EcJVAsD8Yk=
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Content-Disposition: form-data; name="user[avatar]"; filename="1.png"
Content-Type: image/png
PNG