Commit 7f67699

* **http1:**

* withdraw a stale want when the client dispatcher takes a request (#4208) ([c44f1cc5](https://github.com/hyperium/hyper/commit/c44f1cc51c2bc45b502031a646d3d54315bd7a16))

* remove content-length if transfer-encoding is auto-added (#4224) ([69396fdd](https://github.com/hyperium/hyper/commit/69396fdd960629d69b09cc6c9b367ef8650c001d))

* always remove content-length if transfer-encoding is sent (#4223) ([a5d7fd78](https://github.com/hyperium/hyper/commit/a5d7fd7861598c0b8c857cb75240a75bcfbd96a3))

* let a Connection close token win over a later keep-alive (#4201) ([5dadff76](https://github.com/hyperium/hyper/commit/5dadff76d1cb5d21046218df3568569fbba8ed21))

* preserve hop-by-hop when setting close or keep-alive (#4196) ([74a39081](https://github.com/hyperium/hyper/commit/74a39081ff1496970fb75da75c5282b23a9b69e5))

* **http2:** do not reserve capacity for idle Upgraded streams (#4198) ([e89d0d93](https://github.com/hyperium/hyper/commit/e89d0d93d9566210ee95aea234a00952ebc4a202))

* **http1:** add max_header_size limit for server and client (#4183) ([d1cd14ef](https://github.com/hyperium/hyper/commit/d1cd14eff392be63a2318d690cc9380723ec61a1), closes [#3832](https://github.com/hyperium/hyper/issues/3832))