:8884

reverse_proxy 127.0.0.1:65535 {
	lb_retries 5

	# request matchers (backward-compatible, non-expression)
	lb_retry_match {
		method POST PUT
	}
	lb_retry_match {
		path /foo*
	}
	lb_retry_match {
		header X-Idempotency-Key *
	}

	# response status code via expression
	lb_retry_match {
		expression `{rp.status_code} in [502, 503, 504]`
	}

	# response header via expression
	lb_retry_match {
		expression `{rp.header.X-Retry} == "true"`
	}

	# CEL request functions combined with response placeholders
	lb_retry_match {
		expression `method('POST') && {rp.status_code} >= 500`
	}
	lb_retry_match {
		expression `path('/api*') && {rp.status_code} in [502, 503]`
	}
	lb_retry_match {
		expression `host('example.com') && {rp.status_code} == 503`
	}
	lb_retry_match {
		expression `query({'retry': 'true'}) && {rp.status_code} >= 500`
	}
	lb_retry_match {
		expression `header({'X-Idempotency-Key': '*'}) && {rp.status_code} in [502, 503]`
	}
	lb_retry_match {
		expression `protocol('https') && {rp.status_code} == 502`
	}
	lb_retry_match {
		expression `path_regexp('^/api/v[0-9]+/') && {rp.status_code} >= 500`
	}
	lb_retry_match {
		expression `header_regexp('Content-Type', '^application/json') && {rp.status_code} == 502`
	}

	# transport error handling via placeholder
	lb_retry_match {
		expression `{rp.is_transport_error} || {rp.status_code} in [502, 503]`
	}
	lb_retry_match {
		expression `{rp.is_transport_error} && method('POST')`
	}
}
----------
{
	"apps": {
		"http": {
			"servers": {
				"srv0": {
					"listen": [
						":8884"
					],
					"routes": [
						{
							"handle": [
								{
									"handler": "reverse_proxy",
									"load_balancing": {
										"retries": 5,
										"retry_match": [
											{
												"method": [
													"POST",
													"PUT"
												]
											},
											{
												"path": [
													"/foo*"
												]
											},
											{
												"header": {
													"X-Idempotency-Key": [
														"*"
													]
												}
											},
											{
												"expression": "{http.reverse_proxy.status_code} in [502, 503, 504]"
											},
											{
												"expression": "{http.reverse_proxy.header.X-Retry} == \"true\""
											},
											{
												"expression": "method('POST') \u0026\u0026 {http.reverse_proxy.status_code} \u003e= 500"
											},
											{
												"expression": "path('/api*') \u0026\u0026 {http.reverse_proxy.status_code} in [502, 503]"
											},
											{
												"expression": "host('example.com') \u0026\u0026 {http.reverse_proxy.status_code} == 503"
											},
											{
												"expression": "query({'retry': 'true'}) \u0026\u0026 {http.reverse_proxy.status_code} \u003e= 500"
											},
											{
												"expression": "header({'X-Idempotency-Key': '*'}) \u0026\u0026 {http.reverse_proxy.status_code} in [502, 503]"
											},
											{
												"expression": "protocol('https') \u0026\u0026 {http.reverse_proxy.status_code} == 502"
											},
											{
												"expression": "path_regexp('^/api/v[0-9]+/') \u0026\u0026 {http.reverse_proxy.status_code} \u003e= 500"
											},
											{
												"expression": "header_regexp('Content-Type', '^application/json') \u0026\u0026 {http.reverse_proxy.status_code} == 502"
											},
											{
												"expression": "{http.reverse_proxy.is_transport_error} || {http.reverse_proxy.status_code} in [502, 503]"
											},
											{
												"expression": "{http.reverse_proxy.is_transport_error} \u0026\u0026 method('POST')"
											}
										]
									},
									"upstreams": [
										{
											"dial": "127.0.0.1:65535"
										}
									]
								}
							]
						}
					]
				}
			}
		}
	}
}