OAuth and servers

My understanding of OAuth is the following:

    - client sends request token during redirect to server
    - Server displays authorization screen to resource owner
    - Resource owner provides uid and pw (not passed to client)
    - Server sends access token back to client
    - clients then users the Access token to gain access to a 

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So I want to learn how to write a web service using OAuth.

Is there a web site I can communicate with that uses OAuth for my web service.  Something like yahoo, google, etc.  But this woud probably require previous exchange of tokens.  

So do I actually have to write a server as well ?

I am writing a client, and need a server to communicate with, what is the easiest path from here ?

Anthony LuciaAsked:
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Mayank SAssociate Director - Product EngineeringCommented:
The client doesn't send any tokens to the server. The server creates and sends tokens to the client. I had explained it in this question clearly in detail as to what is created by whom and how these are exchanged:


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Mayank SAssociate Director - Product EngineeringCommented:
You can also try to communicate with an existing server that supports O-Auth, e.g., Twitter.

You can use Google Signpost for creating the client. Look at some sample code:


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