Web server vs application server in Nginx - Practice Questions

Challenge - 5 Problems

🧠 Conceptual

intermediate

Role of Nginx as a Web Server

Which statement best describes the primary role of Nginx when used as a web server?

A It serves static content and forwards requests to application servers.

B It processes business logic and runs application code directly.

C It stores data and manages database transactions.

D It compiles source code into executable programs.

💡 Hint

Think about what a web server does when a user visits a website.

Nginx as a web server mainly serves static files like images and HTML. It also forwards dynamic requests to application servers that handle the business logic.

💻 Command Output

intermediate

Nginx Configuration for Proxying Requests

Given the following Nginx configuration snippet, what will be the result when a client requests /app?

Nginx

location /app {
    proxy_pass http://127.0.0.1:8080;
}

A Nginx forwards the request to an application server running on localhost port 8080.

B Nginx returns a 404 Not Found error for /app requests.

C Nginx serves the request directly from its own files under /app.

D Nginx blocks the request due to missing permissions.

💡 Hint

Look at the proxy_pass directive and its target address.

The proxy_pass directive tells Nginx to forward matching requests to the specified backend server, here at localhost port 8080.

❓ Troubleshoot

advanced

Diagnosing 502 Bad Gateway Error

When Nginx is configured to proxy requests to an application server, clients sometimes get a 502 Bad Gateway error. What is the most likely cause?

A Nginx configuration file has a syntax error causing it to fail starting.

B Nginx is serving static files but the files are missing.

C The client sent a malformed HTTP request that Nginx rejected.

D The application server is not running or not reachable at the proxy address.

💡 Hint

Think about what happens if Nginx cannot connect to the backend server.

A 502 Bad Gateway error means Nginx tried to contact the application server but failed, often because the server is down or unreachable.

🔀 Workflow

advanced

Setting Up Nginx as Reverse Proxy for Application Server

Which sequence correctly describes the steps to configure Nginx as a reverse proxy for an application server running on port 5000?

A 1,2,4,3

B 4,1,2,3

C 1,4,2,3

D 2,1,4,3

💡 Hint

Think about installing software before configuring it and starting services.

You first install Nginx, then start the application server, configure Nginx to proxy requests, and finally restart Nginx to apply changes.

✅ Best Practice

expert

Optimizing Nginx and Application Server Setup

Which practice improves performance and reliability when using Nginx as a web server in front of an application server?

A Serve all dynamic content directly from Nginx without forwarding to the application server.

B Use Nginx to serve static files and cache responses from the application server.

C Disable keep-alive connections between Nginx and the application server to reduce resource use.

D Run the application server on the same port as Nginx to simplify configuration.

💡 Hint

Consider how caching can reduce load and speed up responses.

Serving static files with Nginx and caching dynamic responses reduces load on the application server and improves response times.