How to test a web server network?

1. Functional Testing: Checking the availability and correct operation of each web server and applications on them. Testing HTTP requests (GET, POST, etc.) and responses (status codes 200, 404, 500, etc.). Verifying SSL/TLS operation.

2. Performance/Load Testing: Simulating a large number of concurrent users to evaluate response time, throughput, and stability under peak loads. Using tools like JMeter, Gatling.

3. Security Testing: Finding vulnerabilities (SQL injections, XSS, CSRF, SSL/TLS vulnerabilities), port scanning, checking protection against DoS/DDoS attacks. Tools: OWASP ZAP, Nessus.

4. Availability Testing (High Availability - HA): Testing cluster solutions, load balancers. Simulating server failures to verify failover and continuous operation.

5. Compatibility Testing: Checking operation across different browsers, operating systems, and devices, if relevant for server applications.

6. Configuration Testing: Verifying correct settings of web servers (Apache, Nginx, IIS), databases, firewalls, DNS.

7. Monitoring and Logging: Checking the correctness of monitoring systems (Prometheus, Grafana, Zabbix) and log collection systems (ELK Stack, Splunk). Analyzing logs for errors and warnings.

8. Automation: Writing scripts or using frameworks for automating functional testing (Selenium WebDriver for web interfaces), API testing (Postman, Rest-Assured), load testing.

# Example of a simple request to a web server using Python requests
import requests

url = "https://example.com"

try:
    response = requests.get(url)
    response.raise_for_status()  # Will raise an exception for error status codes (4xx or 5xx)
    print(f"Successful request to {url}. Status code: {response.status_code}")
except requests.exceptions.RequestException as e:
    print(f"Error requesting {url}: {e}")