Responses are not compressed

Audit check compression · worth 6 of 100 points · all checks

What the audit saw

The HTML was served without gzip, brotli, or deflate encoding.

Why it costs you

Text compresses to roughly a fifth of its size. On a slow mobile connection that is the difference between a page that appears and one that does not, and it costs one line of configuration.

How to find it on your site

  1. Confirm the response has no content-encoding 
    curl -sSI -H 'Accept-Encoding: gzip, br' https://your-site.com/ | grep -iE 'content-encoding|content-length'
  2. nginx 
    gzip on;
gzip_types text/html text/css application/javascript application/json image/svg+xml;
gzip_min_length 256;
# brotli, if the module is present
brotli on;
brotli_types text/html text/css application/javascript application/json image/svg+xml;
  3. Caddy compresses by default; for Netlify add a header rule 
    # netlify.toml
[[headers]]
  for = "/*"
  [headers.values]
    Content-Encoding = "br"  # only if your build already emits .br files

How to know it is fixed

curl -sSI -H 'Accept-Encoding: gzip' https://your-site.com/ | grep -i content-encoding
# expect: content-encoding: gzip   (or br)

The part people get wrong

Compressing images again saves nothing and wastes CPU. This is for text only. Also check that a CDN in front is not stripping the header.

Check it against your own site

Open an issue with your URL and a bot runs this check plus 14 others, posts the failures with the measured values, and publishes a report page: free audit. If you want the fixes applied and re-verified instead: fixed-price tiers.

Other checks

The site does not answer on the URL you gave · The page is served over plain HTTP · The TLS certificate is expired or about to exp · No mobile viewport tag · The page title is missing or the wrong length · The meta description is missing or the wrong l · The page has no H1, or more than one · Images have no alt text

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