Micro-caching for dynamic content in Nginx - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable micro-caching for 1 second in nginx.

Nginx

proxy_cache_path /tmp/cache keys_zone=microcache:10m max_size=100m inactive=60m;

server {
    location / {
        proxy_cache microcache;
        proxy_cache_valid 200 [1]s;
        proxy_pass http://backend;
    }
}

Drag options to blanks, or click blank then click option'

A60

B10

C1

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Setting cache time too long, which defeats micro-caching purpose.

Using zero or negative values causing errors.

The proxy_cache_valid directive sets how long responses are cached. For micro-caching, 1 second is typical to reduce load but keep content fresh.

2fill in blank

medium

Complete the code to bypass cache for logged-in users based on a cookie.

Nginx

server {
    location / {
        proxy_cache microcache;
        proxy_cache_bypass [1];
        proxy_pass http://backend;
    }
}

Drag options to blanks, or click blank then click option'

A$http_cookie ~* "logged_in"

B$cookie_logged_in

C$cookie_user

D$http_logged_in

Attempts:

3 left

💡 Hint

Common Mistakes

Using undefined variables like $http_logged_in.

Not using regex match operator for cookie string.

The proxy_cache_bypass directive can use a condition. Checking if the logged_in cookie exists in $http_cookie disables cache for logged-in users.

3fill in blank

hard

Fix the error in the micro-cache key definition to include the request URI.

Nginx

proxy_cache_key [1];

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A$scheme_host$request_uri

B$scheme$host$uri

C$host$request_uri

D$scheme$host$request_uri

Attempts:

3 left

💡 Hint

Common Mistakes

Using undefined variables like $scheme_host.

Using $uri which excludes query parameters.

The cache key should uniquely identify requests. Combining $scheme, $host, and $request_uri ensures different URLs and protocols are cached separately.

4fill in blank

hard

Fill both blanks to set cache control headers and enable micro-caching for 2 seconds.

Nginx

server {
    location / {
        add_header Cache-Control "public, max-age=[1]";
        proxy_cache_valid 200 [2]s;
        proxy_cache microcache;
        proxy_pass http://backend;
    }
}

Drag options to blanks, or click blank then click option'

A2

B1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using different values causing cache headers and proxy cache to mismatch.

Setting too long max-age for micro-caching.

Setting Cache-Control max-age to 2 seconds matches the micro-cache duration set by proxy_cache_valid for 200 responses.

5fill in blank

hard

Fill all three blanks to create a micro-cache zone, set cache key, and bypass cache for POST requests.

Nginx

proxy_cache_path /tmp/microcache keys_zone=[1]:10m max_size=50m inactive=1h;

server {
    location /api/ {
        proxy_cache [2];
        proxy_cache_key [3];
        proxy_cache_bypass $request_method = POST;
        proxy_pass http://backend_api;
    }
}

Drag options to blanks, or click blank then click option'

Amicrocache

B$scheme$host$request_uri

C$host$request_uri

Dcache_zone

Attempts:

3 left

💡 Hint

Common Mistakes

Using different zone names causing cache errors.

Using incomplete cache keys missing query parameters.

The cache zone name must be consistent in proxy_cache_path and proxy_cache. The cache key should uniquely identify requests using $scheme$host$request_uri. POST requests bypass cache.