Make gwt website crawlable without hash symbol?

In GWT we need to use # in a URL to navigate from one page to another i.e for creating history for eg. www.abc.com/#questions/10245857 but due to which I am facing a problem in sharing the url. Google scrappers are reading the url only before # i.e. www.abc.com. Now I want to remove # from my url and want to keep it straight as www.abc.com/question/10245857. I am unable to do so. How can I do this? When user navigates the app I use the hash urls and History object (as to not reload the pages). However sometimes it's nice/needed to have a pretty URL (e.g. for sharing, showing in public, etc..) so I would like to know how to provide the pretty URL of the same page. Note: We have to do this to make our webpages url crawlable and to link the website with outside world.

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