lib/httpx/plugins/multipart/part.rb in httpx-0.13.2 vs lib/httpx/plugins/multipart/part.rb in httpx-0.14.0

@@ -17,10 +17,10 @@
           content_type = value[:content_type]
           filename = value[:filename]
           value = value[:body]
         end
 
-        value = value.open(:binmode => true) if value.is_a?(Pathname)
+        value = value.open(:binmode => true) if Object.const_defined?(:Pathname) && value.is_a?(Pathname)
 
         if value.is_a?(File)
           filename ||= File.basename(value.path)
           content_type ||= MimeTypeDetector.call(value, filename) || "application/octet-stream"
           [value, content_type, filename]