adding example 'webserver reverse proxy'

examples/webserver_reverse_proxy/.gitignore

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+##
+## directory
+##
+/bin
+/build
+/logs
+/public
+
+
+##
+## extension
+##
+*.exe
+*.out
+*.app
+
+
+##
+## file
+##
+/.vscode/settings.json
+/.vscode/launch.json

examples/webserver_reverse_proxy/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+project(webserver_reverse_proxy_example)
+
+include(CheckIncludeFileCXX)
+
+check_include_file_cxx(any HAS_ANY)
+check_include_file_cxx(string_view HAS_STRING_VIEW)
+if(HAS_ANY AND HAS_STRING_VIEW)
+    set(CMAKE_CXX_STANDARD 17)
+else()
+    set(CMAKE_CXX_STANDARD 14)
+endif()
+
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+find_package(Drogon CONFIG REQUIRED)
+
+if(CMAKE_CXX_STANDARD LESS 17)
+#With C++14, use boost to support any and string_view
+    message(STATUS "use c++14")
+    find_package(Boost 1.61.0 REQUIRED)
+    target_include_directories(simple_reverse_proxy PRIVATE ${Boost_INCLUDE_DIRS})
+else()
+    message(STATUS "use c++17")
+endif()
+
+set(EXECUTABLE_OUTPUT_PATH          ${CMAKE_CURRENT_SOURCE_DIR}/bin)
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY  ${CMAKE_CURRENT_SOURCE_DIR}/bin)
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY  ${CMAKE_CURRENT_SOURCE_DIR}/bin)
+set(CMAKE_PDB_OUTPUT_DIRECTORY      ${CMAKE_CURRENT_SOURCE_DIR}/bin)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY  ${CMAKE_CURRENT_SOURCE_DIR}/bin)
+
+add_subdirectory(src/webserver/drogon_server)
+add_subdirectory(src/backend/backend_api)
+add_subdirectory(src/backend/backend_www)

examples/webserver_reverse_proxy/README.md

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+# drogon framework example: webserver reverse proxy
+
+__NOTE:__
+
+```
+this example show how to use drogon as webserver and using reverse proxy
+```
+
+<br>
+
+## steps:
+
+- add these:
+    ```txt
+    127.0.0.1   localhost.com
+    127.0.0.1   api.localhost.com
+    127.0.0.1   admin.localhost.com
+    127.0.0.1   www.localhost.com
+    ```
+
+    to
+
+    - __linux debian__ base location:
+
+        - `/etc/hosts`:
+
+    - __windows__ base location:
+
+        - `C:\Windows\System32\drivers\etc\hosts`:
+
+    ---
+
+- make it sure drogon config is already installed on your machine environment
+
+- build this project, *you can use build-debug-linux.sh on linux environment*
+
+- launch:
+    - terminal:
+        - go to _*./bin*_ directory and run each of these:
+            - `./drogon_server`
+            - `./backend_api`
+            - `./backend_www`
+
+    - open your browser:
+        - go to:
+            - `http://www.localhost.com:9999`:
+                - this will redirect to `http://localhost.com:9999`
+
+            - `http://localhost.com:9999`:
+                - will show example message and which port is called
+
+            - `http://api.localhost.com:9999`:
+                - will show json message from which port
+
+            - `http://api.localhost.com:9999/test`:
+                - will show json message from `/test` endpoint/path and show which port is called
+
+<br>
+
+---
+
+## preview result example
+
+- [preview result example 1](https://raw.githubusercontent.com/prothegee/prothegee/main/previews/_preview-example-drogon_server-1.png)
+- [preview result example 2](https://raw.githubusercontent.com/prothegee/prothegee/main/previews/_preview-example-drogon_server-2.png)
+
+<br>
+
+---
+
+###### end of readme

examples/webserver_reverse_proxy/build-debug-linux.sh

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+mkdir -p bin;
+mkdir -p build;
+
+mkdir -p logs/access;
+mkdir -p logs/info;
+
+mkdir -p public;
+
+cmake -B build -DCMAKE_BUILD_TYPE=Debug;
+cmake --build build --config Debug;

examples/webserver_reverse_proxy/config.backend_api.json

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+{
+    "custom_config": {
+        "_": "don't use me"
+    },
+    "listeners": [
+        {
+            "address": "0.0.0.0",
+            "port": 9104,
+            "https": false
+        },
+        {
+            "address": "0.0.0.0",
+            "port": 9105,
+            "https": false
+        },
+        {
+            "address": "0.0.0.0",
+            "port": 9106,
+            "https": false
+        }
+    ],
+    "mime": {
+        "text/markdown": "md",
+        "text/gemini": [
+            "gmi", "gemini"
+        ],
+        "text/css": [
+            "css", "css.map"
+        ],
+        "text/javascript": [
+            "js", "mjs", "js.map", "framework.js", "loader.js",
+            "audio.worklet.js",
+            "data", "pck",
+            "wasm", "side.wasm",
+            "worker.js"
+        ]
+    },
+    "app": {
+        "number_of_threads": 2,
+        "document_root": "../public",
+        "enable_session": false,
+        "session_timeout": 604800,
+        "session_same_site" : "Strict",
+        "session_cookie_key": "_backend_api-session-id",
+        "max_connections": 262144,
+        "max_connections_per_ip": 0,
+        "client_max_body_size": "5M",
+        "client_max_memory_body_size": "5M",
+        "client_max_websocket_message_size": "5M",
+        "log": {
+            "use_spdlog": false,
+            "log_path": "../logs/info",
+            "logfile_base_name": "backend_api.info",
+            "log_size_limit": 100000000,
+            "max_files": 30,
+            "log_level": "INFO"
+        },
+        "run_as_daemon": false,
+        "relaunch_on_error": false,
+        "upload_path": "uploads",
+        "use_sendfile": true,
+        "use_gzip": true,
+        "use_brotli": true,
+        "static_files_cache_time": 480,
+        "idle_connection_timeout": 600,
+        "enable_server_header": true,
+        "server_header_field": "Drogon Framework",
+        "enable_date_header": false,
+        "keepalive_requests": 0,
+        "br_static": true,
+        "reuse_port": false,
+        "file_types": [
+            "gif",
+            "png",
+            "jpg",
+            "map",
+            "js",
+            "framework.js",
+            "loader.js",
+            "bundle.js",
+            "min.js",
+            "js.map",
+            "js.flow",
+            "module.js",
+            "cjs",
+            "mjs",
+            "css",
+            "css.map",
+            "min.css",
+            "min.css.map",
+            "rtl.css.map",
+            "rtl.min.css.map",
+            "scss",
+            "html",
+            "ico",
+            "swf",
+            "svg",
+            "xap",
+            "apk",
+            "cur",
+            "xml",
+            "ttf",
+            "woff",
+            "woff2",
+            "text",
+            "txt",
+            "json",
+            "audio.worklet.js",
+            "data",
+            "pck",
+            "wasm",
+            "side.wasm",
+            "worker.js"
+        ]
+    },
+    "plugins": [
+        {
+            "name": "drogon::plugin::AccessLogger",
+            "dependencies": [],
+            "config": {
+                "log_path": "../logs/access",
+                "log_format": "$request_date $method $url [$body_bytes_received] ($remote_addr - $local_addr) $status $body_bytes_sent $processing_time",
+                "log_file": "backend_api.access.log",
+                "log_size_limit": 100000000,
+                "use_local_time": true,
+                "log_index": 0
+            }
+        }
+    ]
+}