Build your own HTTP Server from scratch challenge

This is part of codecrafters.io's "Build Your Own HTTP server" Challenge
Had fun building this one.

How to run

1. Ensure you have go (1.19) installed locally
2. Run ./your_server.sh to run the HttpServer which is implemented in app/server.go.
3. Or run make build or make test

Features

Respond with a 200 on root path

Request

$ curl -v http://localhost:4221

Response

HTTP/1.1 200 OK
Content-Type: text/plain

Echo Server

Request

$ curl -v http://localhost:4221/echo/abc

Response

HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: 3

abc

Reads Content Headers and returns User_Agent as a response

Request

$ curl -v --header "User-Agent: foobar/1.2.3" http://localhost:4221/user-agent

Response

HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: 12

foobar/1.2.3

Supports concurrent connections

Requests

$ (sleep 3 && printf "GET / HTTP/1.1\r\n\r\n") | nc localhost 4221 &
$ (sleep 3 && printf "GET / HTTP/1.1\r\n\r\n") | nc localhost 4221 &
$ (sleep 3 && printf "GET / HTTP/1.1\r\n\r\n") | nc localhost 4221 &

Responses

HTTP/1.1 200 OK
Content-Type: text/plain

HTTP/1.1 200 OK
Content-Type: text/plain

HTTP/1.1 200 OK
Content-Type: text/plain

Support File Downloads

Request 1

$ echo -n 'Hello, World!' > $TMPDIR/foo
$ curl -i http://localhost:4221/files/foo

Response 1

HTTP/1.1 200 OK
Content-Type: application/octet-stream
Content-Length: 13

Hello, World!

Request 2

$ curl -i http://localhost:4221/files/non_existant_file

Response 2

HTTP/1.1 404 Not Found
Content-Type: text/plain

File not found

Supports File Uploads

Request 1

curl -v --data "12345" -H "Content-Type: application/octet-stream" http://localhost:4221/files/file_123

Response 1

HTTP/1.1 201 Created

Request 2

curl -i http://localhost:4221/files/file_123 

Response 2

HTTP/1.1 200 OK
Content-Type: application/octet-stream
Content-Length: 5

12345

Supports gzip compression

Request

curl -v -H "Accept-Encoding: gzip" http://localhost:4221/echo/abc

Response (formatted)

HTTP/1.1 200 OK
Content-Length: 27
Content-Encoding: gzip
Content-Type: text/plain
 
{ [27 bytes data]
100    27  100    27    0     0   4373      0 --:--:-- --:--:-- --:--:--  4500
* Connection #0 to host localhost left intact
00000000  1f 8b 08 00 00 00 00 00  00 ff 4a 4c 4a 06 04 00  |..........JLJ...|
00000010  00 ff ff c2 41 24 35 03  00 00 00                 |....A$5....|
0000001b