Simple Go HTTP Server

This is a basic HTTP server written in Go. It listens on a specified port and handles various HTTP requests, including serving files, echoing content, and returning the User-Agent string.

Features

• Echo Endpoint: Returns the content appended to /echo/ in the URL.
• User-Agent Endpoint: Returns the User-Agent string from the request.
• File Serving: Serves files from a specified directory. Supports GET and POST methods.
• Gzip Compression: Supports gzip compression based on the Accept-Encoding header.

Usage

Starting the Server

To start the server, run the following command:

go run main.go [directory]

• Directory (optional): The directory from which to serve files. If not specified, the current directory will be used.

Endpoints

Echo Endpoint

• URL: /echo/{content}
• Method: GET
• Description: Returns the {content} appended to the URL.

User-Agent Endpoint

• URL: /user-agent
• Method: GET
• Description: Returns the User-Agent string from the request.

File Serving

• URL: /files/{filename}
• Method:
  • GET: Serves the specified file.
  • POST: Saves the content in the request body to the specified file.
• Description: Serves or saves files in the specified directory.

Example Requests

Echo Content:

curl http://localhost:4221/echo/hello

Response:

hello

Get User-Agent:

curl http://localhost:4221/user-agent

Response:

curl/7.68.0

Serve File:

curl http://localhost:4221/files/example.txt

Save File:

curl -X POST -H "Content-Type: text/plain" -d "This is a test" http://localhost:4221/files/example.txt

Implementation

Here's a brief overview of the code structure:

• main.go: The main entry point of the server.
  • main(): Starts the server and listens on the specified port.
  • handleConnection(conn net.Conn): Handles incoming connections.
  • parseRequest(conn net.Conn): Parses the HTTP request.
  • getStatus(statusCode int, statusText string): Returns the HTTP status line.
  • getDirectoryFromArgs(): Returns the directory from which to serve files, defaulting to the current directory if not specified.

Error Handling

• Returns 400 Bad Request for malformed requests.
• Returns 404 Not Found for unknown paths or missing files.
• Returns 405 Method Not Allowed for unsupported methods.
• Returns 500 Internal Server Error for server-side errors during file operations.

Gzip Compression

The server supports gzip compression if the Accept-Encoding header includes gzip. Compressed responses include the Content-Encoding: gzip header.

License

This project is licensed under the MIT License.