flutter pub add sync_http根據套件公開資料產生的選型評估，僅供參考。
sync_http 是 Dart 的同步 HTTP 客戶端，設計用於簡化在異步操作不理想環境中的 HTTP 請求。它提供了一個直觀的 API，用於同步執行 GET、POST、PUT 等 HTTP 方法，阻塞執行直到收到回應。這使其適用於需要簡單線性控制流程的場景，例如 CLI 工具或腳本。該套件由 Google 維護，支援多個平台，包括 Android、iOS、macOS、Windows 和 Linux。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
A Dart HTTP client implemented using RawSynchronousSockets to allow for synchronous HTTP requests.
Note: this package is only intended for very specialized use cases. For general HTTP usage, please see instead package:http.
This library should probably only be used to connect to HTTP servers that are hosted on 'localhost'. The operations in this library will block the calling thread to wait for a response from the HTTP server. The thread can process no other events while waiting for the server to respond. As such, this synchronous HTTP client library is not suitable for applications that require high performance. Instead, such applications should use libraries built on asynchronous I/O, including dart:io and package:http, for the best performance.