send_file pdf problem

For me it works fine for code:

file_path=c:/pdfs/file.pdf send_file(file_path,               :filename => File.basename(file_path),               :type => 'application/pdf',               :disposition => 'inline',               :streaming => 'true',               :buffer_size => 4096) <-- I changed that.

But in fact I'm still in development stage and I haven't tried it on Apache server.