How to build Unity in WebGL

when i use “Build and Run” it’s ok in first time
but after that it’s told me like this
“Failed to download file Build/webgl.data.gz. Loading web pages via a file:// URL without a web server is not supported by this browser. Please use a local development web server to host Unity content, or use the Unity Build and Run option.”

how to fix it. Thank you

Hello,

Would you kindly please report this issue via the Bug Reporter tool?
https://unity.com/releases/editor/qa/bug-reporting
Please make sure to write the exact steps needed to be taken so that the reproduction would be visually seen. Also make sure to attach a reproduction project and any visual material so that when testing our CQA team can verify that they got the same results. If you can, please use this template:

How to reproduce:

  1. Open the attached project
  2. Do this
  3. Do that
  4. Select this
  5. Observe that

Expected result: Something is visible, something is printed or something happens
Actual result: The opposite of what I expect happens

Reproducible with: Editor version I am using (e.g: 2021.3.xf1)

Reproduced on: The OS I am on (e.g: Windows 11, macOS Ventura 13.1 (Intel/Silicon))