flutter-handling-http-and-jsonlisted

# Handling HTTP and JSON ## Contents - [Core Guidelines](#core-guidelines) - [Workflow: Executing HTTP Operations](#workflow-executing-http-operations) - [Workflow: Implementing JSON Serialization](#workflow-implementing-json-serialization) - [Examples](#examples) ## Core Guidelines - **Enforce HTTPS:** iOS and Android disable cleartext (HTTP) connections by default. Always use HTTPS endpoints. - **Construct URIs Safely:** Always use `Uri.https(authority, unencodedPath, [queryParameters])` to build URLs safely. - **Handle Status Codes:** Always validate `http.Response.statusCode`. Treat `200` and `201` as success. Throw explicit exceptions for other codes. - **Prevent UI Jank:** Move expensive JSON parsing (>16ms) to a background isolate using `compute()`. ## Workflow: Executing HTTP Operations - [ ] Add the `http` package to `pubspec.yaml`. - [ ] Configure platform permissions (Internet permission in `AndroidManifest.xml`). - [ ] Construct the target `Uri`. - [ ] Execute the HTTP method (`http.get`, `http.post`, `http.put`, `http.delete`). - [ ] Validate the response and parse JSON payload. ## Workflow: Implementing JSON Serialization **Small prototype / simple models:** Use manual serialization with `dart:convert`. - [ ] Define Model class with `final` properties. - [ ] Implement `factory Model.fromJson(Map<String, dynamic> json)`. - [ ] Implement `Map<String, dynamic> toJson()`. **Production app / complex models:** Use code generation with `json_serializable` or `f