Gzip configuration (types, min_length) in Nginx - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable gzip compression in nginx.

Nginx

gzip [1];

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

Aon

Boff

Cenable

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'enable' instead of 'on'

Using 'true' instead of 'on'

Setting gzip on; enables gzip compression in nginx.

2fill in blank

medium

Complete the code to set the minimum length of a response to be gzipped to 1000 bytes.

Nginx

gzip_min_length [1];

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

A2000

B1500

C500

D1000

Attempts:

3 left

💡 Hint

Common Mistakes

Setting too low a value like 500

Using values larger than needed

The directive gzip_min_length 1000; sets the minimum response size to 1000 bytes for gzip compression.

3fill in blank

hard

Fix the error in the gzip_types directive to include correct MIME types.

Nginx

gzip_types [1];

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

Atext/plain text/css application/json

Btext/plain, text/css, application/json

Ctext/plain; text/css; application/json

Dtext/plain|text/css|application/json

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas or semicolons between MIME types

Using pipes '|' as separators

In nginx, MIME types in gzip_types are space-separated without commas or other separators.

4fill in blank

hard

Fill both blanks to set gzip compression for JSON and JavaScript files with a minimum length of 512 bytes.

Nginx

gzip_types [1];
gzip_min_length [2];

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

Aapplication/json application/javascript

Bapplication/json, application/javascript

C512

D1024

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas in MIME types

Setting min_length too high

Use space-separated MIME types for gzip_types and set gzip_min_length to 512 bytes.

5fill in blank

hard

Fill all three blanks to enable gzip, set minimum length to 256 bytes, and compress HTML and CSS files.

Nginx

gzip [1];
gzip_min_length [2];
gzip_types [3];

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

Aon

B256

Ctext/html text/css

Doff

Attempts:

3 left

💡 Hint

Common Mistakes

Disabling gzip accidentally

Using commas in MIME types

Setting min_length too high

Enable gzip with on, set minimum length to 256 bytes, and specify MIME types space-separated.

Practice

1. What does the gzip_types directive do in an nginx configuration?

easy

A. Defines the compression level for gzip

B. Specifies which MIME types should be compressed using gzip

C. Enables or disables gzip compression globally

D. Sets the minimum file size for gzip compression

Solution

1. Step 1: Understand the purpose of gzip_types

   The gzip_types directive tells nginx which file types (MIME types) to compress when gzip is enabled.

2. Step 2: Differentiate from other gzip directives

   gzip_min_length sets minimum size, gzip enables compression, and compression level is set by gzip_comp_level. So gzip_types is about file types.

3. Final Answer:

   Specifies which MIME types should be compressed using gzip -> Option B

4. Quick Check:

   gzip_types = file types to compress [OK]

Hint: gzip_types controls file types compressed, not size or enable [OK]

Common Mistakes:

• Confusing gzip_types with gzip_min_length
• Thinking gzip_types enables gzip globally
• Mixing gzip_types with compression level settings

2. Which of the following is the correct syntax to set gzip minimum length to 1000 bytes in nginx?

easy

A. gzip_min_length = 1000;

B. gzip_minlength 1000;

C. gzip_min_length 1000;

D. gzip_min_length: 1000;

Solution

1. Step 1: Recall nginx directive syntax

   nginx directives use the format directive_name value; without equals or colons.

2. Step 2: Check spelling and punctuation

   The correct directive is gzip_min_length with underscore, no equals sign, and ends with semicolon.

3. Final Answer:

   gzip_min_length 1000; -> Option C

4. Quick Check:

   Correct syntax = gzip_min_length 1000; [OK]

Hint: Use underscore and semicolon, no equals or colon [OK]

Common Mistakes:

• Using equals sign (=) in directive
• Misspelling gzip_min_length as gzip_minlength
• Using colon (:) instead of semicolon

3. Given this nginx config snippet:

gzip on;
gzip_types text/plain application/json;
gzip_min_length 1000;

What happens when a 500-byte JSON response is sent?

medium

A. The JSON response is sent uncompressed

B. The JSON response is compressed with gzip

C. The server returns an error due to size

D. The JSON response is compressed only if client supports gzip

Solution

1. Step 1: Check gzip_min_length effect

   The gzip_min_length 1000; means only responses larger than 1000 bytes get compressed.

2. Step 2: Compare response size and type

   The JSON response is 500 bytes, less than 1000, so it will not be compressed despite matching type.

3. Final Answer:

   The JSON response is sent uncompressed -> Option A

4. Quick Check:

   Response size < gzip_min_length = no compression [OK]

Hint: Check response size against gzip_min_length first [OK]

Common Mistakes:

• Assuming all gzip_types are compressed regardless of size
• Ignoring gzip_min_length setting
• Confusing client support with server compression decision

4. You have this nginx config:

gzip on;
gzip_types text/html text/css;
gzip_min_length 512

Why might gzip not compress CSS files as expected?

medium

A. gzip is disabled by default

B. gzip_types does not include CSS MIME type

C. gzip_min_length value is too high

D. Missing semicolon after gzip_min_length directive

Solution

1. Step 1: Check syntax of gzip_min_length

   The directive gzip_min_length 512 is missing a semicolon at the end, causing nginx to ignore or error on it.

2. Step 2: Understand effect of syntax error

   Without proper syntax, gzip_min_length may not apply correctly, causing unexpected behavior in compression.

3. Final Answer:

   Missing semicolon after gzip_min_length directive -> Option D

4. Quick Check:

   Every directive must end with semicolon [OK]

Hint: Always end nginx directives with semicolon [OK]

Common Mistakes:

• Forgetting semicolon at directive end
• Assuming gzip_types excludes CSS by default
• Thinking gzip is off unless explicitly enabled

5. You want to compress only JSON and JavaScript files larger than 1500 bytes using gzip in nginx. Which configuration snippet achieves this correctly?

hard

A. gzip on;\ngzip_types application/json application/javascript;\ngzip_min_length 1500;

B. gzip on;\ngzip_types json js;\ngzip_min_length 1500;

C. gzip on;\ngzip_types application/json application/javascript;\ngzip_min_length 1500

D. gzip on;\ngzip_types application/json application/javascript;\ngzip_min_length=1500;

Solution

1. Step 1: Verify gzip is enabled

   The directive gzip on; correctly enables gzip compression.

2. Step 2: Check gzip_types values

   Use correct MIME types: application/json and application/javascript are valid. Short forms like 'json' or 'js' are invalid.

3. Step 3: Confirm gzip_min_length syntax

   The directive must end with semicolon and no equals sign. gzip_min_length 1500; is correct.

4. Final Answer:

   gzip on;\ngzip_types application/json application/javascript;\ngzip_min_length 1500; -> Option A

5. Quick Check:

   Correct MIME types + syntax + min_length = gzip on;\ngzip_types application/json application/javascript;\ngzip_min_length 1500; [OK]

Hint: Use full MIME types and end directives with semicolon [OK]

Common Mistakes:

• Using shorthand MIME types like 'json' or 'js'
• Omitting semicolon at directive end
• Using equals sign in directives