Cookie header encoding

### Link to the code that reproduces this issue https://codesandbox.io/p/devbox/interesting-babbage-2lwwy5 ### To Reproduce open preview in new window refresh page to ensure cookie is set see log in terminal ### Current vs. Expected behavior Current - user_name=John%2FDoe Expected - user_name=John/Doe ### Provide environment information ```bash Operating System: Platform: linux Arch: x64 Version: #1 SMP PREEMPT_DYNAMIC Sun Aug 6 20:05:33 UTC 2023 Available memory (MB): 4242 Available CPU cores: 2 Binaries: Node: 20.9.0 npm: 9.8.1 Yarn: 1.22.19 pnpm: 8.10.2 Relevant Packages: next: 15.2.2-canary.0 // Latest available version is detected (15.2.2-canary.0). eslint-config-next: N/A react: 19.0.0 react-dom: 19.0.0 typescript: 5.3.3 Next.js Config: output: N/A ``` ### Which area(s) are affected? (Select all that apply) Not sure ### Which stage(s) are affected? (Select all that apply) next dev (local) ### Additional context Now i need to do: ```ts const requestHeaders = Object.fromEntries(headersList.entries()); if (requestHeaders.cookie) { requestHeaders.cookie = decodeURIComponent(requestHeaders.cookie); } ```