How to escape # in the redirect_uri for OAuth2?

I am redirecting user to salesforce for OAuth. It is giving me the error that unsupported response_type. When i debugged in the detail then i found that it is due to # in the url. 

How can i escape #? I tried %23 but it didnt work.  Here is the URL

https://login.salesforce.com/services/oauth2/authorize?client_id={client_id}&redirect_uri=https://example.com/#/salesforce/callback&response_type=code&state={state}