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Use EMSCRIPTEN_FETCH_SYNCHRONOUS in PocketPy custom module to send HTTP(s) requests from inside WASM

Instructions for this devcontainer

Tested with PocketPy v2.0.0, Emscripten v3.1.64.

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. Download pocketpy.c and pocketpy.h from release into pocketpy subfolder. These two files are enough to embed PocketPy into example program:
curl -L --compressed --output-dir pocketpy --create-dirs -O "https://github.com/pocketpy/pocketpy/releases/download/v2.0.0/pocketpy.{c,h}"
  1. Compile the example using Emscripten:
emcc -I pocketpy pocketpy/pocketpy.c -s -Os -s ALLOW_MEMORY_GROWTH=1 -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 332k-sized main.wasm are loaded into browser, refer to browser developer console to see the results.

Finish

Perform your own experiments if desired.