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egutierrez 1cdbe1bcd1 feat(cpp/core): add http_request + http_get_json helpers (issue 0110)

Promotes the inline curl-popen pattern duplicated across apps/services_monitor,
dag_engine_ui, data_factory into two reusable functions in cpp/functions/core/:

- http_request_cpp_core: generic HTTP client (GET/POST/PUT/DELETE/PATCH) via
  cURL CLI through popen. Portable Linux/WSL/MinGW (no link-time libcurl).
  Supports custom headers, raw body, Bearer/Basic auth shortcuts, timeout,
  optional TLS verify skip. Returns status/body/headers/error/duration_ms.

- http_get_json_cpp_core: convenience wrapper over http_request — GET <url>,
  expect 2xx, parse body as nlohmann::json. Throws std::runtime_error on
  transport / non-2xx / parse failure.

Vendors nlohmann/json v3.11.3 single header at cpp/vendor/nlohmann/json.hpp
(MIT). No CMake target needed — header-only; consumers add
cpp/vendor/ to include path.

2026-05-18 18:14:37 +02:00

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nlohmann/json

Single-header JSON library. Vendored for cpp/functions/core/http_get_json and future C++ functions that need JSON serialization without an extra dependency.

Source: https://github.com/nlohmann/json
Version: v3.11.3
File: json.hpp (amalgamated single header)
License: MIT
Download: curl -L -o json.hpp https://github.com/nlohmann/json/releases/download/v3.11.3/json.hpp

Include with:

#include "nlohmann/json.hpp"
using json = nlohmann::json;

Include path: cpp/vendor/ (so nlohmann/json.hpp resolves). Tests + fn_framework already have cpp/vendor/ on the include search path via the top-level cpp/CMakeLists.txt (vendor/nlohmann is header-only so it does NOT need a CMake target — just target_include_directories(<t> PRIVATE ${CMAKE_SOURCE_DIR}/vendor)).

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