Sooo. My team and I have module we're supposed to be porting to async code and aiohttp will not work. The server keeps rejecting the byte payload, but if we use synch code like the requests library, it works fine. The code is like identical, the only difference is async. It's been really frustrating because another drop in async version of requests (httpx) works just fine! I don't want to use httpx, the rest of our codebase is already using aiohttp! We think the problem is with gzip encoding being handled incorrectly by aiohttp. I've reported the issue.