v = v.encode('utf-8')
# RFC 2047 requires non-ASCII field names to be encoded, while RFC 7578
# suggests sending UTF-8 directly. Firefox sends UTF-8, too
- content = b'Content-Disposition: form-data; name="%s"\r\n\r\n' % k + v + b'\r\n'
+ content = b'Content-Disposition: form-data; name="' + k + b'"\r\n\r\n' + v + b'\r\n'
if boundary.encode('ascii') in content:
raise ValueError('Boundary overlaps with data')
out += content