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Use EMSCRIPTEN_FETCH_SYNCHRONOUS in C program compiled with Emscripten to send HTTP(s) requests from inside WASM

Instructions for this devcontainer

Tested with Emscripten v3.1.61.

Preparation

  1. Open this repo in devcontainer, e.g. using Github Codespaces. Type or copy/paste following commands to devcontainer's terminal.

Building

  1. cd into the folder of this example:
cd browser-sync-xhr
  1. Compile the example using Emscripten:
emcc -s FETCH=1 --proxy-to-worker -o main.js main.c

This command will output main.wasm, main.js, and main.worker.js.

Test with browser

  1. Run simple HTTP server to temporarily publish project to Web:
python3 -m http.server

Codespace will show you "Open in Browser" button. Just click that button or obtain web address from "Forwarded Ports" tab.

  1. As index.html, JS files, and a 21k-sized main.wasm are loaded into browser, refer to browser developer console to see the results.

Finish

Perform your own experiments if desired.