Use Gzip compression for CSV files

Dashboard

The following example rule will configure Gzip compression as the preferred compression method for CSV files. If the visitor does not support this algorithm, Cloudflare will try to compress the response using a different algorithm supported by the visitor.

When incoming requests match

• Custom filter expression:
  • File extension equals csv

Then

• Compression options: Custom
• Define a custom order for compression types: Gzip, Auto

API

The following example sets the rules of an existing entry point ruleset (with ID {ruleset_id}) for the http_response_compression phase to a single compression rule, using the Update a zone ruleset operation:

Required API token permissions

At least one of the following token permissions is required:

• Response Compression Write
• Config Settings Write
• Dynamic URL Redirects Write
• Cache Settings Write
• Custom Errors Write
• Origin Write
• Managed headers Write
• Zone Transform Rules Write
• Mass URL Redirects Write
• Magic Firewall Write
• L4 DDoS Managed Ruleset Write
• HTTP DDoS Managed Ruleset Write
• Sanitize Write
• Transform Rules Write
• Select Configuration Write
• Bot Management Write
• Zone WAF Write
• Account WAF Write
• Account Rulesets Write
• Logs Write
• Logs Write

Update a zone ruleset

curl "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/rulesets/$RULESET_ID" \
  --request PUT \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --json '{
    "rules": [
        {
            "ref": "use_gzip_for_csv",
            "expression": "http.request.uri.path.extension eq \"csv\"",
            "action": "compress_response",
            "action_parameters": {
                "algorithms": [
                    {
                        "name": "gzip"
                    },
                    {
                        "name": "auto"
                    }
                ]
            }
        }
    ]
  }'

Use the ref field to get stable rule IDs across updates when using Terraform. Adding this field prevents Terraform from recreating the rule on changes. For more information, refer to Troubleshooting in the Terraform documentation.