The redirect is caused by the APPEND_SLASH setting:
APPEND_SLASH
Default: True
When set to True, if the request URL
does not match any of the patterns in
the URLconf and it doesn’t end in a
slash, an HTTP redirect is issued to
the same URL with a slash appended.
Note that the redirect may cause any
data submitted in a POST request to be
lost.
Make sure your server and client are consistent with trailing slashes.
If your project does not need the trailing slashes at all (i.e., it is an api without trailing slashes) you can disable it. Otherwise, make sure your urlconf accept paths without a trailing slash.