i haven't actually written code to upload profile images recently, but what
i would try is the following (and i apologise if i'm slightly incorrect as
i'm doing this from memory):
Advertising
> 1. What all parameters should be part of the signature base string?
>
oauth_consumer_key
oauth_signature_method
oauth_timestamp
oauth_nonce
oauth_version
oauth_token
of course, the request type and URL comprise the block that needs to be
signed
2. Where should the parameters and the signature be placed in the
> request stream?
>
the authorization header would be the best place to stick it.
> 3. How should the file data be sent?
multipart/form-data, i believe.
--
Raffi Krikorian
Twitter Platform Team
http://twitter.com/raffi