Use Rewindable#wrap.

async-http.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
 	spec.add_dependency "async-pool", "~> 0.7"
 	spec.add_dependency "io-endpoint", "~> 0.11"
 	spec.add_dependency "io-stream", "~> 0.4"
-	spec.add_dependency "protocol-http", "~> 0.28"
+	spec.add_dependency "protocol-http", "~> 0.29"
 	spec.add_dependency "protocol-http1", "~> 0.20"
 	spec.add_dependency "protocol-http2", "~> 0.18"
 	spec.add_dependency "traces", ">= 0.10"

lib/async/http/middleware/location_redirector.rb

@@ -81,17 +81,7 @@ def call(request)
 					# We don't want to follow redirects for HEAD requests:
 					return super if request.head?
 
-					if body = request.body
-						if body.respond_to?(:rewind)
-							# The request body was already rewindable, so use it as is:
-							body = request.body
-						else
-							# The request body was not rewindable, and we might need to resubmit it if we get a response status of 307 or 308, so make it rewindable:
-							body = ::Protocol::HTTP::Body::Rewindable.new(body)
-							request.body = body
-						end
-					end
-
+					body = ::Protocol::HTTP::Body::Rewindable.wrap(request)
 					hops = 0
 
 					while hops <= @maximum_hops