Well,
If by "offline" you mean that you absolutely do not have access to the Internet, I think you have no choice. Although this will mean that you will not be able to test your web service calls.
Otherwise, if you use API calls, you can use free API servers such as http://myjson.com/api . This is a simple JSON store for your website or mobile application.
I often use it at the development stage.
Hope this can help.
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