Rewind body after checking request signature

[sunny]

Before

Trying to read the request body after calling a Slack verification, returns an empty body:

Slack::Events::Request.new(request).verify!
request.body.read # => ""

This is because calling request.body.read on Rack requests causes the body’s StringIO to go to the end of the string.

After

Therefore, to minimize surprise, we can rewind the body after reading it. After this fix, we get the following:

Slack::Events::Request.new(request).verify!
request.body.read # => "payload=%7B%22type%22%3A%22blo…"

[dblock]

Thanks, makes sense!