Enable Zstandard compression for default content types

The following example rule will turn on Zstandard compression for response content types where Cloudflare applies compression by default. If the client does not support Zstandard compression, it will use Brotli or Gzip compression as a fallback.

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

• 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

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_zstd_compression",
						"expression": "(http.response.content_type.media_type in {\"text/html\" \"text/richtext\" \"text/plain\" \"text/css\" \"text/x-script\" \"text/x-component\" \"text/x-java-source\" \"text/x-markdown\" \"application/javascript\" \"application/x-javascript\" \"text/javascript\" \"text/js\" \"image/x-icon\" \"image/vnd.microsoft.icon\" \"application/x-perl\" \"application/x-httpd-cgi\" \"text/xml\" \"application/xml\" \"application/rss+xml\" \"application/vnd.api+json\" \"application/x-protobuf\" \"application/json\" \"multipart/bag\" \"multipart/mixed\" \"application/xhtml+xml\" \"font/ttf\" \"font/otf\" \"font/x-woff\" \"image/svg+xml\" \"application/vnd.ms-fontobject\" \"application/ttf\" \"application/x-ttf\" \"application/otf\" \"application/x-otf\" \"application/truetype\" \"application/opentype\" \"application/x-opentype\" \"application/font-woff\" \"application/eot\" \"application/font\" \"application/font-sfnt\" \"application/wasm\" \"application/javascript-binast\" \"application/manifest+json\" \"application/ld+json\" \"application/graphql+json\" \"application/geo+json\"})",
						"action": "compress_response",
						"action_parameters": {
								"algorithms": [
										{
												"name": "zstd"
										},
										{
												"name": "brotli"
										},
										{
												"name": "gzip"
										}
								]
						}
				}
		]
	}'

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.