# HTTP Authentication Server

This project implements a simple HTTP server with various features including basic authentication, rate limiting, and handling different HTTP methods and status codes.

## Features

- **Home Page**: Displays a welcome message.
- **GET and POST Handlers**: Handles query parameters and POST data.
- **Rate Limiting**: Limits the number of requests to prevent abuse.
- **Basic Authentication**: Protects certain routes with basic authentication.
- **Status Handlers**: Returns different HTTP status codes.

## Endpoints

- `/`: Home page
- `/200`: Returns a "200 OK" message
- `/404`: Returns a "404 Not Found" message
- `/500`: Returns a "500 Internal Server Error" message
- `/authenticated`: Protected route requiring basic authentication
- `/limited`: Rate-limited endpoint

## Prerequisites

- Go 1.16 or higher
- `golang.org/x/time/rate` package for rate limiting

## Setup

1. Clone the repository:

git clone https://github.com/yourusername/http-auth.git cd http-auth

2. Set up environment variables:
Create a `.env` file in the project root and add:

AUTH_USERNAME=your_username AUTH_PASSWORD=your_password

3. Install dependencies:

go mod tidy

## Running the Server

Run the following command in the project root:

go run .

The server will start on `http://localhost:8080`.

## Testing

### Manual Testing with cURL

1. Test the home page:

curl -i 'http://localhost:8080/'

2. Test status codes:

curl -i 'http://localhost:8080/200' curl -i 'http://localhost:8080/404' curl -i 'http://localhost:8080/500'

3. Test authentication:

curl -i 'http://localhost:8080/authenticated' curl -i 'http://localhost:8080/authenticated' -H 'Authorization: Basic YWRtaW46c2VjcmV0'

Note: Replace 'YWRtaW46c2VjcmV0' with the Base64 encoding of your username:password.

4. Test rate limiting:

ab -n 1000 -c 100 'http://localhost:8080/limited'

### Automated Testing

Run test with

go test

## Load Testing

Install ApacheBench (ab) and run:

ab -n 10000 -c 100 'http://localhost:8080/'