HTTP Server

• HTTP protocol is one of the most important techonology which allows the communication over network.
• This was one of the challenge of codecrafters and I really enjoyed building it and I will make it like a mini express soon.

Run the server

1. Ensure you have cmake installed locally, also make sure to configure vcpkg
2. Run ./your_program.sh to run your program, which is implemented in src/main.cpp.(first make it executablechmod +x your_program.sh)
3. Use curl to make request.

curl -i http://localhost:4221/

Current features

1. Concurrent Connection

2. Persisten Connection, if sent Connection: close, then it will shut the connection.

3. Allowed compression using gzip algorithm(implemented using zlib)

4. Route you can hit and get desired output:

   1. /echo/{str}
   • Send desired string in params, and you will get output like:

   curl -i http://localhost:4221/echo/http-protocol
   
   Output:
   HTTP/1.1 200 OK
   Content-Type: text/plain
   Content-Length: 13
   
   http-protocol

   2. /user-agent
   • It will return User agent(The client used to send a request)

   curl -i http://localhost:4221/user-agent
   
   Ouput:
   HTTP/1.1 200 OK
   Content-Type: text/plain
   Content-Length: 10
   
   curl/8.5.0

   3. GET /files/{file_path}
   • Read from the file in desired location. You need to give the location in command line argument. (./your-program.sh --directory /tmp/)
   • It will read from the given file path if the file exits, else it will return with 404.

   1. File exists
      curl -i http://localhost:4221/files/hello.txt
   
      HTTP/1.1 200 OK
      Content-Type: application/octet-stream
      Content-Length: 12
   
      Hello, World
   
   2. File does not exist
   
   curl -i http://localhost:4221/files/world.txt
   
   HTTP/1.1 404 Not Found
   

   4. POST /files/{path}, Body : {file content}
   • It will write to file with given path.
   5. GET /
   • It will return 200 Ok.

Files

1. main

• Initialises a TCP connection and attach to the port
• Using multithreading we can connect to different client and handle each of them separatley while keeping the connection persistent.

2. Utils

• Utitlity function to parse and format the strings.