Add the ability to send metrics to prometheus via http-client-lite header only library

Author: biaks

3rdpatry/http-client-lite/CMakeLists.txt

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+# Copyright 2021... by Maxim Gusev
+#
+# https://github.com/John-Jasper-Doe/http-client-lite
+#
+# Distributed under the MIT License.
+# (See accompanying file LICENSE or copy at https://mit-license.org/)
+
+cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+project(http-client-lite)
+
+## Set output binary
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
+
+## Set property
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+add_compile_options(-Wall -Werror -Wextra -Wpedantic -g -O0)
+
+
+option(HTTP_CLIENT_LITE_OPT_BUILD_EXAMPLES "Build examples" OFF )
+
+if(HTTP_CLIENT_LITE_OPT_BUILD_EXAMPLES)
+  add_subdirectory(examples)
+endif()
+
+# Interface library:
+add_library(${PROJECT_NAME} INTERFACE)
+target_sources(${PROJECT_NAME} INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include/jdl/httpclientlite.h)
+add_custom_target(${PROJECT_NAME}.hdr SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/include/jdl/httpclientlite.h)
+target_include_directories(
+    ${PROJECT_NAME}
+    INTERFACE
+        "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
+        "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")

3rdpatry/http-client-lite/LICENSE

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+The MIT License
+
+Copyright (c) 2016 Christian C. Sachs
+Copyright (c) 2021 Maxim Gusev
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

3rdpatry/http-client-lite/README.md

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+# HTTP Client lite: C++ Cross-platform library only from single-file header-only
+
+This is a lite, C++ cross-platform header-only client library for http request based 
+on [csachs/picohttpclient](https://github.com/csachs/picohttpclient) project.
+
+A Lightweight HTTP 1.1 client where to quickly do very simple HTTP requests, 
+without adding larger dependencies to a project.
+
+
+## License
+
+http client lite  is distributed under the [MIT License](https://github.com/john-jasper-doe/http-client-lite/blob/master/LICENSE).
+
+
+## Example usage
+
+To see how this can be used see the examples folders.
+
+
+**Example:**
+```C++
+#include <jdl/httpclientlite.hpp>
+...
+using namespace jdl;
+...
+HTTPResponse response = HTTPClient::request(HTTPClient::GET, URI("http://example.com"));
+cout << response.body << endl;
+...
+```
+

3rdpatry/http-client-lite/examples/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+project(http-client-lite-examples)
+
+add_executable(${PROJECT_NAME}_simple_request simple_request.cpp)
+target_link_libraries(${PROJECT_NAME}_simple_request PRIVATE http_client_lite)

3rdpatry/http-client-lite/examples/simple_request.cpp

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+/*
+ *  example for httpclientlite.hxx
+ */
+
+#include <iostream>
+#include <map>
+#include <string>
+
+#include <jdl/httpclientlite.h>
+
+
+using namespace jdl;
+
+
+int main(int argc, char *argv[]) {
+  if (argc == 1) {
+    std::cout << "Use " << argv[0] << " http://example.org" << std::endl;
+    return EXIT_SUCCESS;
+  }
+
+  HTTPResponse response = HTTPClient::request(HTTPClient::POST, URI(argv[1]));
+
+  if (!response.success) {
+    std::cout << "Request failed!" << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  std::cout << "Request success" << endl;
+
+  std::cout << "Server protocol: " << response.protocol << std::endl;
+  std::cout << "Response code: " << response.response << std::endl;
+  std::cout << "Response string: " << response.responseString << std::endl;
+
+  std::cout << "Headers:" << std::endl;
+
+  for (stringMap::iterator it = response.header.begin(); it != response.header.end(); ++it) {
+    std::cout << "\t" << it->first << "=" << it->second << std::endl;
+  }
+
+  std::cout << response.body << std::endl;
+
+  return EXIT_SUCCESS;
+}