GET /r/:XXXXXXXX

[nazanin-bayati]

As a user, I want to get redirected to my previously determined page by hash id.

Given hash id,
When verb is GET,
Then get redirected to original URL.

When hash id is not found,
Then raise Not Found .

When hash id is not given,
Then raise Forbidden.

When 'hash id' length is too long or too short (refer to #1),
Then raise Bad Request.

When hash id is invalid,
Then raise Bad Request.