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What Brotli does on a VPS
Brotli is a lossless HTTP compression format. A compatible browser advertises support with the Accept-Encoding request header; the server can then send a smaller representation and identify it with Content-Encoding: br. The browser decompresses the response before handing it to the page.
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The useful targets are text-heavy responses: HTML, CSS, JavaScript, JSON, XML, plain text and SVG. JPEG, PNG, GIF, most video, ZIP files and other archives are already compressed, so applying Brotli usually spends CPU without producing a worthwhile reduction. Brotli is therefore a web-server configuration task with two separate implementation choices:
- Runtime compression: the server compresses each response as it is requested. This is simple, but consumes CPU on every compression pass.
- Pre-compressed delivery: your build or deployment process creates a matching
.brfile once, and the server serves it when the client supports Brotli. This avoids repeated compression work.
Use runtime compression first for a small, controlled set of text responses. Add pre-compressed delivery for static assets when your deployment process can reliably keep the original and .br files synchronized.
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Choose the NGINX or Apache path
| Decision point | NGINX | Apache |
|---|---|---|
| Required component | A Brotli filter module; a static module is optional for serving pre-compressed files. | mod_brotli, available in Apache 2.4.26 and later. |
| Enable compression | brotli on; |
AddOutputFilterByType BROTLI_COMPRESS ... for selected types, or SetOutputFilter BROTLI_COMPRESS for broader scope. |
| MIME control | brotli_types adds MIME types; text/html is compressed by default by the Google module. |
Put the MIME types you want after AddOutputFilterByType. |
| Pre-compressed files | Use the static module and brotli_static on; when matching .br files are deployed. |
Configure delivery so the response carries Content-Encoding: br and caches vary on Accept-Encoding. |
| Validation and reload | nginx -t, then nginx -s reload. |
Use your normal Apache configuration test and graceful-reload workflow after enabling the module; the exact service command depends on the VPS distribution. |
Follow the section for the server that terminates HTTP or HTTPS traffic. If a reverse proxy sits in front of your application, configure Brotli on the component that actually sends the response to the client.
Enable Brotli in NGINX
1. Install a module that matches your NGINX build
Stock NGINX builds do not universally include Brotli. Install a module compiled for the exact NGINX distribution and version running on the VPS. F5’s NGINX Plus instructions show this Debian/Ubuntu example:
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sudo apt update
sudo apt install nginx-plus-module-brotliOn a RHEL-family distribution, use the available yum or dnf package workflow and the module package supplied for that NGINX build. Do not copy a module from an unrelated NGINX version: a binary-module mismatch can prevent NGINX from starting. If your distribution does not provide a compatible package, use a vendor-supported build or compile the Google ngx_brotli module for your exact NGINX source and deployment process.
2. Load the dynamic modules in the main context
Place the module declarations in the main (top-level) context of nginx.conf, before the http block. The filter module is required for on-the-fly compression. Load the static module as well only if you will serve pre-compressed files:
load_module modules/ngx_http_brotli_filter_module.so;
load_module modules/ngx_http_brotli_static_module.so;The path is the one used in the documented NGINX Plus example. A package on your VPS may install the files in a different directory; use the paths delivered by that package. Loading a file that does not exist, or loading a module built for an incompatible NGINX version, will make nginx -t fail.
3. Turn on the filter and select text formats
Inside the http, server or location context, enable Brotli and list the additional MIME types you want compressed:
brotli on;
brotli_types text/plain text/css application/javascript application/json application/xml image/svg+xml;The Google module documentation states that text/html is always compressed and that brotli_types adds MIME types. The directive matches the response’s MIME type, so an application that labels a response incorrectly may not be compressed even when its contents are text.
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Keep this list focused. JavaScript may be served as application/javascript or another JavaScript MIME type depending on your stack; add only types your server actually emits and have tested. Do not add image, video or archive types merely because they are large.
4. Enable static delivery only when .br files exist
For build-time compression, deploy files such as app.js and app.js.br together, then add:
brotli_static on;This directive is useful only when matching pre-compressed files are generated during your build or deployment. It is not a command that creates them. If a requested asset has no valid .br counterpart, the normal uncompressed file (or runtime-compressed response, if configured) must remain available.
5. Test the syntax and reload without stopping the server
- Run the configuration test:
nginx -tProceed only when NGINX reports a successful syntax check. The error output identifies missing modules, invalid contexts and typographical errors.
- Ask NGINX to reload the validated configuration:
nginx -s reloadA reload lets existing workers finish while new workers use the updated configuration. Check the service and error logs immediately afterward for module-load or syntax errors. If the reload fails, restore the previous configuration and correct the reported line before trying again.
Enable Brotli in Apache
1. Confirm the Apache version and module
Apache HTTP Server 2.4.26 and later provide mod_brotli. The module supplies the BROTLI_COMPRESS output filter, which compresses server output in Brotli format before it is sent over the network. Install or enable the module using the package and module mechanism supplied by your Linux distribution, then confirm that Apache starts with it loaded. Package names and helper commands vary between distributions, so use the module package corresponding to your installed Apache version rather than copying a command for another operating system.
2. Compress selected MIME types (recommended starting point)
For Apache 2.4.26 and newer, attach the filter to text-oriented types:
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AddOutputFilterByType BROTLI_COMPRESS text/html text/plain text/xml text/css text/javascript application/javascript application/jsonThis approach limits compression to responses whose declared type is in the list. Add a type only after confirming that your application uses that type and that the response is not already compressed by another layer. SVG and other textual formats can be added when they are served as text and your deployment benefits from compressing them.
3. Use broad filtering only with explicit exclusions
Apache also documents a broader filter:
SetOutputFilter BROTLI_COMPRESS
SetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-brotliThe first line applies the filter broadly; the second shows the style of exclusion needed for common already-compressed images. A broad rule can catch binary downloads, archives or media that should not be recompressed, so a MIME-type allow-list is generally easier to audit. Extend exclusions for every non-text class your server delivers rather than assuming the example covers all of them.
4. Reload and inspect the logs
Run the Apache configuration test used by your distribution, then perform a graceful reload through its service manager. If Apache rejects the configuration, read the exact module, directive or syntax error in the test output and in the error log. A successful reload does not prove that a particular URL is compressed; verification must be done with a request that advertises Brotli support.
Runtime versus pre-compressed assets
Runtime compression
Runtime compression is convenient for generated HTML and API responses because the server can compress the current output without a separate build artifact. Its cost is CPU work on each compression pass. The cost depends on response size, Brotli quality settings, request volume and the VPS CPU; there is no single compression-ratio or latency percentage that applies to every VPS.
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Pre-compressed delivery
Apache’s documentation notes that mod_brotli recompresses content each time a request is made, and that pre-compressing content can provide a performance benefit by avoiding that work. A typical deployment creates .br files for CSS and JavaScript, publishes them beside the originals and configures the server to select them only for clients that advertise br.
The response must identify the representation correctly:
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Content-Encoding: brtells the client that the body is Brotli-compressed.Vary: Accept-Encodingtells shared caches that compressed and uncompressed representations vary by the request’s encoding capability.- The uncompressed original must remain available for clients that do not send
br.
Do not deploy a stale .br file after replacing its source asset. A stale compressed artifact can be served successfully while containing old code, which is a release-integrity problem rather than a compression problem.
Verify that the VPS returns Brotli
1. Request a known text asset with negotiation
Use an HTTPS URL for a CSS, JavaScript, HTML or JSON response that should be compressible:
curl -I -H 'Accept-Encoding: br' https://example.com/asset.cssIn the response headers, look for:
Content-Encoding: br— the body is Brotli-compressed.Vary: Accept-Encoding— important when a shared cache can store responses for multiple kinds of clients.- A suitable
Content-Type— confirms that your MIME rule matches what the server actually emits.
An HTTP redirect, an application error, an upstream proxy response or a response with a non-text MIME type may not show Brotli even when the module is configured correctly. Follow the final URL and test an asset known to be served by the configured NGINX or Apache instance.
2. Check the non-Brotli path
Request the same resource without advertising br:
curl -I https://example.com/asset.cssThe server should return an uncompressed body or another encoding supported by that client. It must not send a Brotli body to a client that did not negotiate it. If both requests return identical headers, inspect which process is terminating the connection and whether a proxy or cache is replacing the origin response.
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3. Inspect logs and cache behavior
After a reload, review the web-server error log for module-load failures, unknown directives and permission errors. If the origin shows Content-Encoding: br but a client does not, inspect the reverse proxy and CDN headers. If a cache serves the wrong representation, verify that it honors Vary: Accept-Encoding and that compressed and uncompressed objects are not being keyed as one response.
Troubleshoot common failures
“unknown directive brotli” in NGINX
The filter module is not loaded, was not installed, or was built for an incompatible NGINX version. Confirm the module package, check the path in each load_module line and rerun nginx -t. Loading only the static module does not provide the brotli filter directive.
NGINX will not start after adding load_module
Run nginx -t before another reload. Correct a wrong file path, remove a module that your package does not provide, or install a module compiled for the running NGINX build. Do not repeatedly restart a production service while the syntax test is failing.
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The header lacks Content-Encoding: br
Check that the request includes Accept-Encoding: br, that the response is not a redirect or error, and that its MIME type matches your allow-list. For NGINX, remember that brotli_types adds types while text/html is handled by default by the Google module. For Apache, verify that the response type exactly matches one of the types in AddOutputFilterByType and that mod_brotli is loaded.
Pre-compressed files are ignored
On NGINX, confirm that the static module is loaded and that brotli_static on; is in a context that covers the request. Confirm that the matching .br filename is deployed beside the original. On Apache, verify that the pre-compressed response is configured with Content-Encoding: br and that caches vary on Accept-Encoding; merely placing a file with a .br suffix does not automatically make every Apache configuration serve it.
CPU usage rises sharply
Runtime compression is being performed too often or at a costly quality setting. Restrict compression to text responses, exclude large or already-compressed content, cache stable assets and generate .br files during deployment. Measure the resulting CPU and response-time changes on your own workload rather than applying a published percentage that was measured on different hardware or content.
Security considerations for compressed HTTPS responses
Compression over TLS can create a BREACH-family information-disclosure risk for vulnerable applications. The risk is greatest when a response reflects attacker-controlled input alongside a secret, such as a CSRF token or other sensitive value, and an attacker can observe response-size changes across many requests. Apache’s documentation specifically warns that some web applications are vulnerable when a TLS connection carries compressed data.
Begin with static assets and ordinary text responses. Review pages that reflect secrets or sensitive tokens before enabling compression there. Possible mitigations include disabling compression for those responses, separating secrets from reflected content, reducing reflection of attacker-controlled data and applying the application’s established CSRF and session protections. Brotli itself does not create the application vulnerability; it can make a size side channel practical when the surrounding response design is unsafe.
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- Identify which service terminates HTTP or HTTPS and configure that service, not only the upstream application.
- Install a Brotli module compatible with the exact NGINX or Apache build.
- Limit runtime compression to text-like MIME types.
- Exclude images, video, archives and other already-compressed formats.
- Use
brotli_static on;or an equivalent Apache pre-compressed setup only when matching.brfiles are generated and deployed with their originals. - For compressed responses, send
Content-Encoding: br; for shared caches, sendVary: Accept-Encoding. - Run the server’s configuration test before reloading.
- Verify with one request that advertises
brand one that does not. - Review logs, CPU usage, cache behavior and sensitive-response exposure after rollout.
Practical rollout order
- Enable Brotli for a small set of static CSS and JavaScript files.
- Verify headers and the non-Brotli fallback with
curl. - Check that shared caches distinguish the two representations.
- Add HTML, JSON, XML or SVG only when their MIME types and security characteristics are understood.
- Move high-volume, stable assets to pre-compressed deployment if runtime CPU becomes material.
- Expand coverage gradually while watching logs, CPU and application responses.
This sequence separates configuration errors from application behavior and gives you a safe rollback point: remove the Brotli directives or stop deploying the static variants, then reload the validated configuration.
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