Feel free to check it out and let me know if you're all onboard: https://github.com/kittinunf/Fuel/pull/512 cc @kittinunf @Mark Gilchrist @itnoles @Nikky In a next PR I want to extract the MultiPart changes, but this PR shouldn't grow any bigger. I think it's easier to grasp than the other big one, couldn't really make these changes individually, as I figured out the bugs as I went. In the PR description you can see what exactly has been changes feature/fix wise.