HTTP-Server

C++ HTTP Server

This project is a simple multithreaded HTTP server implemented in C++. It supports basic RESTful operations (GET, POST, PUT, PATCH, DELETE) on a JSON-based database, using a thread pool for concurrent request handling.

Features

• Handles HTTP GET, POST, PUT, PATCH, and DELETE requests
• Serves static HTML and JSON responses
• Stores and manages data in a database.json file
• Supports full and partial updates to database entries
• Logs all requests to requests.json
• Uses a thread pool for concurrent client handling
• Minimal dependencies (uses nlohmann/json for JSON parsing)

Endpoints

GET /

Returns a simple HTML welcome page.

GET /database

Returns the contents of database.json as JSON. If the file does not exist or is empty, returns an error message.

POST /database

Adds a new object to the database. The request body must be a JSON object (without an id field; IDs are auto-generated).

Example request body:

{
	"name": "John Doe",
	"email": "john@example.com"
}

PUT /database

Replaces an existing object in the database by id. The request body must be a JSON object containing the id field and all fields to be set.

Example request body:

{
	"id": 1,
	"name": "Jane Doe",
	"email": "jane@example.com"
}

PATCH /database

Partially updates an existing object in the database by id. The request body must be a JSON object containing the id field and only the fields to update.

Example request body:

{
	"id": 1,
	"email": "newemail@example.com"
}

DELETE /database

Deletes an object from the database by id. The request body must be a JSON object containing the id field.

Example request body:

{
	"id": 1
}

Building and Running

Prerequisites

• g++ (with C++17 support)
• Linux environment
• nlohmann/json single-header file (json.hpp in project root)

Build

You can build the server using the provided VS Code task or manually:

g++ -g -std=c++17 -Wall -Wextra -pedantic-errors -Weffc++ -Wno-unused-parameter -fsanitize=undefined,address *.cpp -o server -pthread

Run

./server

The server listens on port 8080 by default.

Files

• server.cpp — Main server implementation
• threadpool.h — Simple thread pool for concurrent request handling
• json.hpp — nlohmann/json single-header library
• database.json — JSON database (auto-created/updated)
• requests.json — Log of all HTTP requests

Notes

• The server is for educational/demo purposes and is not production-ready.
• Error handling is basic; malformed requests may not be fully supported.
• Only one route (/database) is supported for POST, PUT, PATCH, and DELETE.

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Feel free to extend the server with more features or endpoints!