Go HTTP Server • Saurav

go-http-server

go-http-server is a HTTP server written in GoLang. It is able to handle multiple requests concurrently using Goroutines. Data is exchanged with the server through GET and POST requests.

I have a 3D printer that currently lives in my garage. The location is fine for now, but having to go back and forth from my computer to the printer is getting old. One of my motivations for this project is to connect a raspberry pi or similar type of SBC to my 3D printer and to be able to start and monitor prints from my desk. I thought it would be an interesting project to create the server and client software myself and a great learning opportunity too!

Check it out on my repo!

Update June 12 2024:

I have added support for compressing responses and handling the encoding header in requests. The compressing algorithm used is gzip and the correct encoding and header is included in response now. Also made sure the header parser is case-insensitive in case some clients send headers in lowercase.

package main

import(
  "bytes"
  "compress/gzip"
  "flag"
  ...
)

...

type RequestHeaders struct {
  ...
  ContentType    string
  ContentLength  string
  AcceptEncoding string
  Body           string
}

...

func parseHeaders(connection net.Conn) (*RequestHeaders, error) {
  ...
  contentLen := ""
  acceptEncoding := ""
  body := ""

  for _, line := range request {
    switch {
    ...
    case strings.HasPrefix(strings.ToLower(line), "content-length:"):
      temp := strings.Split(line, " ")
      contentLen = temp[1]
    case strings.HasPrefix(strings.ToLower(line), "accept-encoding:"):
      temp := strings.Split(line, " ")
      // Handle multiple compression scheme values
      if len(temp) > 2 {
        encodings := temp[1:]
        for _, line := range encodings {
          line = strings.ReplaceAll(line, ",", "")
          // For the time being accept gzip compression
          if strings.ToLower(line) == "gzip" {
            acceptEncoding = "gzip"
          }
        }
      } else {
        acceptEncoding = temp[1]
      }
    }
  }

  ...

}

...

func respond200Encode(connection net.Conn, content string, encode string) {
  //gzip encode
  var buffer bytes.Buffer
  writer := gzip.NewWriter(&buffer)
  writer.Write([]byte(content))
  writer.Close()
  encodedContent := buffer.String()

  response := STATUS_200_OK
  encoding := CONTENT_ENCODING + encode + END_HEADER_LINE
  cType := CONTENT_PLAIN
  length := CONTENT_LENGTH + strconv.Itoa(len(encodedContent)) + END_HEADER_BLOCK
  body := encodedContent

  response = response + encoding + cType + length + body
  _, err := connection.Write([]byte(response))
  if err != nil {
    fmt.Println("Error writing to connection: ", err.Error())
  }
  connection.Close()
}

...

Installation

Clone the repository to your computer:

git clone https://github.com/SauravC99/go-http-server.git

Compile the program:

go build app/server.go

Alternate Installation

You can clone the repository using the instructions above and run the server.sh script. The script will compile the program and run it.

Usage

Run the server:

$ ./server
Server started
Listening on port 4221

Run with -h to see avaliable commands:

$ ./server -h
Usage of ./server:
  -directory string
        Directory for file hosting (download and upload)
  -port string
        Port to bind to (default "4221")