Brotli compression in Nginx - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

Check if Brotli module is enabled in nginx

You run the command nginx -V 2>&1 | grep brotli on your server. What output indicates that the Brotli module is enabled?

Nginx

nginx -V 2>&1 | grep brotli

A

nginx version: nginx/1.21.0
built with OpenSSL 1.1.1
--with-http_gzip_module

B

nginx version: nginx/1.21.0
built with OpenSSL 1.1.1
--without-http_brotli_module

C

nginx version: nginx/1.21.0
built with OpenSSL 1.1.1
--with-http_brotli_module

D command not found

💡 Hint

Look for the phrase '--with-http_brotli_module' in the output.

The presence of '--with-http_brotli_module' in the nginx version configuration output means the Brotli module is compiled and enabled.

❓ Configuration

intermediate

Enable Brotli compression in nginx config

Which nginx configuration snippet correctly enables Brotli compression for text and JSON files?

A

brotli enable yes;
brotli_types text/plain application/json;

B

brotli on off;
brotli_types application/xml;

C

brotli on;
brotli_types text/html image/png;

D

brotli on;
brotli_types text/plain application/json;

💡 Hint

The directive to enable Brotli is 'brotli on;' and you specify file types with 'brotli_types'.

Option D correctly uses 'brotli on;' to enable compression and sets 'brotli_types' to compress text/plain and application/json files.

❓ Troubleshoot

advanced

Why is Brotli compression not working for CSS files?

You enabled Brotli compression in nginx but CSS files are not compressed. Which is the most likely cause?

A The 'brotli_types' directive does not include 'text/css'.

B Brotli compression only works for images, not CSS.

C The 'brotli on;' directive is missing from the server block.

D CSS files are too small to be compressed by Brotli.

💡 Hint

Check which MIME types are listed in 'brotli_types'.

If 'text/css' is not included in 'brotli_types', nginx will not compress CSS files with Brotli.

🔀 Workflow

advanced

Order the steps to enable Brotli compression in nginx

Put these steps in the correct order to enable Brotli compression on an nginx server.

A 3,1,2,4

B 1,2,3,4

C 1,3,2,4

D 2,1,3,4

💡 Hint

You must install the module before configuring it, then test and reload.

First install the module, then configure nginx, test the config, and finally reload nginx to apply changes.

✅ Best Practice

expert

Best practice for Brotli compression level in nginx

Which Brotli compression level setting balances good compression and server performance in nginx?

A brotli_comp_level 5;

B brotli_comp_level 1;

C brotli_comp_level 0;

D brotli_comp_level 11;

💡 Hint

Higher levels compress better but use more CPU time.

Level 5 is a good balance between compression ratio and CPU usage; level 11 is slow, level 1 is fast but less compressed.

Practice

1. What is the main purpose of enabling Brotli compression in Nginx?

easy

A. To increase the security of the website

B. To reduce file sizes and speed up website loading

C. To change the website's color scheme

D. To block unwanted visitors

Solution

1. Step 1: Understand Brotli compression purpose

   Brotli compression is designed to reduce the size of files sent from the server to the browser.

2. Step 2: Connect compression to website speed

   Smaller files load faster, improving website speed and user experience.

3. Final Answer:

   To reduce file sizes and speed up website loading -> Option B

4. Quick Check:

   Brotli compression = faster loading [OK]

Hint: Compression reduces file size to speed up loading [OK]

Common Mistakes:

• Thinking Brotli improves security directly
• Confusing compression with design changes
• Assuming it blocks visitors

2. Which of the following is the correct way to enable Brotli compression in an Nginx configuration?

easy

A. brotli on;

B. brotli_enable on;

C. enable_brotli true;

D. brotli_compression = yes;

Solution

1. Step 1: Recall Nginx Brotli syntax

   The correct directive to enable Brotli compression is brotli on;.

2. Step 2: Check other options for syntax errors

   Options A, C, and D use incorrect directive names or syntax not valid in Nginx.

3. Final Answer:

   brotli on; -> Option A

4. Quick Check:

   Enable Brotli = brotli on; [OK]

Hint: Use exact directive 'brotli on;' to enable compression [OK]

Common Mistakes:

• Adding extra words like 'enable' or 'compression'
• Using '=' instead of ';' to end directive
• Wrong directive names

3. Given this Nginx snippet, what will happen when a browser requests a CSS file?

brotli on;
brotli_comp_level 5;
location /css/ {
  brotli_types text/css;
}

medium

A. Compression level 5 disables Brotli

B. CSS files will not be compressed because brotli_types is missing

C. CSS files will be compressed with Brotli at level 5

D. All files will be compressed regardless of type

Solution

1. Step 1: Analyze the configuration

   Brotli is enabled with brotli on; and compression level set to 5.

2. Step 2: Check brotli_types directive

   Only files with MIME type text/css will be compressed, so CSS files are included.

3. Final Answer:

   CSS files will be compressed with Brotli at level 5 -> Option C

4. Quick Check:

   brotli_types text/css = CSS compressed [OK]

Hint: brotli_types controls which file types get compressed [OK]

Common Mistakes:

• Assuming all files compress without brotli_types
• Thinking compression level disables Brotli
• Ignoring MIME type filtering

4. You enabled Brotli in Nginx but notice no files are compressed. Which configuration mistake could cause this?

medium

A. Missing brotli on; directive

B. Setting brotli_comp_level to 0

C. Not specifying brotli_types for file types

D. Using brotli on without a semicolon

Solution

1. Step 1: Check syntax correctness

   In Nginx, directives must end with a semicolon. Missing it causes config errors.

2. Step 2: Understand impact of missing semicolon

   Without the semicolon, Nginx will fail to load the config properly, so Brotli won't work.

3. Final Answer:

   Using brotli on without a semicolon -> Option D

4. Quick Check:

   Missing semicolon breaks config [OK]

Hint: Always end Nginx directives with a semicolon [OK]

Common Mistakes:

• Ignoring semicolon syntax errors
• Assuming 0 disables compression but config still loads
• Thinking brotli_types is mandatory to enable Brotli

5. You want to optimize Brotli compression for your website serving HTML, CSS, and JavaScript files. Which Nginx configuration snippet correctly enables Brotli for these types with maximum compression level?

hard

A. brotli on;\nbrotli_comp_level 11;\nbrotli_types text/html text/css application/javascript;

B. brotli on;\nbrotli_comp_level 5;\nbrotli_types image/png image/jpeg;

C. brotli enable;\nbrotli_level 11;\nbrotli_types text/html text/css application/javascript;

D. brotli on;\nbrotli_comp_level 11;\nbrotli_types text/plain text/xml;

Solution

1. Step 1: Identify correct directive names and values

   Enable Brotli with brotli on; and set max compression level with brotli_comp_level 11;.

2. Step 2: Choose correct MIME types for HTML, CSS, JavaScript

   Use text/html, text/css, and application/javascript in brotli_types.

3. Step 3: Eliminate incorrect options

   The snippet starting with 'brotli enable;' uses invalid directive names ('brotli_level' instead of 'brotli_comp_level'). The snippet with 'image/png image/jpeg' targets unsuitable file types. The snippet with 'text/plain text/xml' uses wrong MIME types and misses JavaScript.

4. Final Answer:

   brotli on;\nbrotli_comp_level 11;\nbrotli_types text/html text/css application/javascript; -> Option A

5. Quick Check:

   Correct directives + right types = brotli on;\nbrotli_comp_level 11;\nbrotli_types text/html text/css application/javascript; [OK]

Hint: Use brotli_comp_level 11 for max compression [OK]

Common Mistakes:

• Using wrong directive names like brotli_level
• Compressing image types with Brotli
• Forgetting JavaScript MIME type