Yes it was the issue of text. file is reading the doc as text not binary. 
Thanks for your help 

Paramnoor Singh

On Wednesday, January 25, 2017 at 5:30:55 PM UTC+5:30, Paramnoor Singh 
wrote:
>
>
> *Problem: *I have use the net/http code for uploading the '.doc', 
> '.docx', '.pdf' and images files on dropbox. But I getting the issues like:
>
> 1.invalid byte sequence in UTF 8 
> 2. Now while the file is uploading but it not uploading the content and 
> even it uploading as a corrupt file.
>
> Below I writing my code to upload the file on dropbox. 
>
>
>
> *Please help me.Code:*uri = URI.parse("
> https://content.dropboxapi.com/2/files/upload";)
>           request = Net::HTTP::Post.new(uri)
>           request.content_type = "application/octet-stream"
>           request["Authorization"] = "Bearer #{$acess_token}"
>           request["Dropbox-Api-Arg"] = 
> "{\"path\":\"/Sass-for-Web-Designers.pdf\"}"
>           request.body = ""
>           request.body << 
> File.open("app/assets/images/categoryImages/Sass-for-Web-Designers.pdf").read
>             #request.body << file.content
>             #file.close
>           #end
>           req_options = {
>             use_ssl: uri.scheme == "https",
>           }
>           response = Net::HTTP.start(uri.hostname, uri.port, req_options) 
> do |http|
>             http.request(request)
>           end
>

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