allow headers to be pattern-matched as well

lib/httpx/pmatch_extensions.rb

@@ -3,11 +3,11 @@
 module HTTPX
   module ResponsePatternMatchExtensions
     def deconstruct
-      [@status, @headers.to_h, @body]
+      [@status, @headers, @body]
     end
 
     def deconstruct_keys(_keys)
-      { status: @status, headers: @headers.to_h, body: @body }
+      { status: @status, headers: @headers, body: @body }
     end
   end
 
@@ -21,6 +21,13 @@ module HTTPX
     end
   end
 
+  module HeadersPatternMatchExtensions
+    def deconstruct
+      to_a
+    end
+  end
+
+  Headers.include HeadersPatternMatchExtensions
   Response.include ResponsePatternMatchExtensions
   ErrorResponse.include ErrorResponsePatternMatchExtensions
 end

test/extensions/response_pattern_match.rb

@@ -3,6 +3,16 @@
 module ResponsePatternMatchTests
   include HTTPX
 
+  def test_response_headers_deconstruct
+    response = Response.new(request, 200, "2.0", { "host" => "google.com", "content-type" => "application/json" })
+    case response
+    in [_, [*, ["content-type", content_type], *], _]
+      assert content_type == "application/json"
+    else
+      raise "unexpected response"
+    end
+  end
+
   def test_response_deconstruct
     response_with_body = Response.new(request, 200, "2.0", { "x-with-body" => "true" })
     response_with_body << "OK"