[BUGFIX]: fix nil pointer bug in request.Clone()

[romanwozniak]

Problem:

http/request.go relies on .GetBody() function to fetch request payload when fiberhttp.Request is being cloned. .GetBody() function is expected to != nil, because it is always set in the factory method (

fiber/http/request.go

Line 32 in 101a992

req.GetBody = func() (io.ReadCloser, error) { return http.NoBody, nil }

)
However, the .Clone() method doesn't set it and that causes panic in runtime when there is an attempt of cloning previously cloned request.

Solution:

• set GetBody function on the cloned request
• update test case to capture the scenario, when the Clone() method is called on the previously cloned request

[krithika369]

LGTM!