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Use Free Pascal (ShortString + sync XMLHTTPRequest) to send HTTP(s) requests from inside WASM

Instructions for this devcontainer

Tested with FreePascal v3.3.1 commit 8132ccd4.

Introduction

FreePascal's WASM RTL seems to have no support for strings yet, so just trying to experiment. ShortString works well, but it is limited to length of 255 bytes.

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-shortstring
  1. Compile the example:
fpcwasm main.pp

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 and a 200kb-sized main.wasm are loaded into browser, refer to browser developer console to see the results.

Finish

Perform your own experiments if desired.