MRAB <pyt...@mrabarnett.plus.com> wrote: > Brandon Fredericks wrote: >> I did a search within this group, but couldn't find any >> information on this. >> >> I am sending base64 encoded data as the content over http using >> urllib2 urlopen. When I receive the data and attempt to decode >> it, I get an "Incorrect Padding" error. Is there a simple way to >> fix this? A better way to send and receive the data possibly >> (using base64 of course)? > > Base-64 encodes 3 bytes (echo in the range 0-255) to 4 bytes > (each in a more restricted range). The length of the output is > _always_ a multiple of 4 (ignoring whitespace); the method adds > extra padding bytes (ASCII '=') to ensure that this is the case > if the length of the input isn't a multiple of 3. > > So, if decoding raises an "Incorrect Padding" error then strip > out any whitespace and append extra ASCII '=' to make its length > a multiple of 3, then try decoding again. (Or you could just > repeatedly add one pad character and retry, up to 3 times.)
The length of the encoded string should be a multiple of 4 (as you state in the second sentence of your post), not a multiple of 3. max -- http://mail.python.org/mailman/listinfo/python-list
