HTTPFixedLengthInputStream and HTTPChunkedInputStream's tellg() method always returns -1.
After my test, I found seekoff(), which is a virtual method in ios::streambuf,
is not implemented in HTTPFixedLengthStreamBuf and HTTPChunkedStreamBuf.
I have also found that seekoff() is implemented in FileStreamBuf, so Poco::FileStreamIOS works well when tellg() method is called!
Below is my tellg() method test file for HTTPFixedLengthInputStream and HTTPChunkedInputStream. I run it with vs2005 + Poco1.41p1.
Sorry for my bad english.