Back4App

Flutter web app containerised for Back4app Containers: pinned Flutter 3.47.5 builds in a throwaway stage, nginx serves it. Web build compiles in 17s. The free way to host a Flutter build in 2026.

A one-page static site in a container, and the measurements behind the Dockerfile that serves it.

The product brief, architecture spine and decision logs that one BMAD Method run wrote to disk, kept verbatim. Companion repo for the Back4app blog tutorial.

Ship a built folder to Back4app web hosting from your editor through the Model Context Protocol — editor config plus a dependency-free deploy script. Companion repo for the Back4app blog tutorial.

Find the nearest driver with Parse GeoPoints and $nearSphere, built from a prompt through the Back4app MCP server — with a haversine check that runs outside the database. Companion repo for the Back4app blog tutorial.

Vanilla JS web page + curl script: upload user images to a managed Back4app backend over REST (POST /files) and serve them from a CDN URL, no bucket or upload server. Measured 2026-09-24: 1 MB in 6.8 s, 25 MB accepted; file URLs stay public whatever the row's ACL.

Node.js 22 + Express app that deploys cleanly on Back4app Containers, plus 8 git branches that each break the deploy in one way (wrong port, missing dependency, bad CMD, missing env var, failing health check, broken Dockerfile, no EXPOSE, oversized image). Companion repo for the Back4app blog error guide.

Flutter 3 + package:http, no SDK: accounts, a per-user Note class (owner pointer + ACL + beforeSave hook), where/limit/skip paging and push registration on a Back4app backend. Real-backend tests: create 440 ms, list 420 ms, update 425 ms medians (Sept 2026). Companion repo for the Back4app blog article.

Bash + curl script that triggers every error code a Back4app (Parse Server) backend returns — 101, 119, 141, 142, 202, 203, 206, 209 and more — and prints HTTP status, code and message. 48 requests, 15 numeric codes, 3 identical runs on Sept 24, 2026. Companion repo for the Back4app blog article.

How to lock down a backend your frontend calls directly: 12 requests from 4 identities against a Parse class on Back4app, open (12/12 allowed) vs class-level permissions + owner ACL hook + role + master key (6/12). Bash + curl probes, Cloud Code, ACL migration. Companion repo for the Back4app blog article.