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reverseproxy: add lb_retry_match condition on response status #7569

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reverseproxy: add lb_retry_match condition on response status #7569

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0283a77
reverseproxy: add `lb_retry_match` condition on response status
seroperson Mar 27, 2026
6087447
Addressing review
seroperson Mar 29, 2026
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58 changes: 58 additions & 0 deletions caddytest/integration/caddyfile_adapt/reverse_proxy_retry_match_oneline.caddyfiletest
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Original file line number Diff line number Diff line change
@@ -0,0 +1,58 @@
:8884

reverse_proxy 127.0.0.1:65535 {
lb_retries 3
lb_retry_match expression `{rp.status_code} in [502, 503]`
lb_retry_match expression `{rp.is_transport_error} || {rp.status_code} == 502`
lb_retry_match expression `method('POST') && {rp.status_code} == 503`
lb_retry_match `{rp.status_code} == 504`
lb_retry_match `{rp.is_transport_error} && method('PUT')`
}
----------
{
"apps": {
"http": {
"servers": {
"srv0": {
"listen": [
":8884"
],
"routes": [
{
"handle": [
{
"handler": "reverse_proxy",
"load_balancing": {
"retries": 3,
"retry_match": [
{
"expression": "{http.reverse_proxy.status_code} in [502, 503]"
},
{
"expression": "{http.reverse_proxy.is_transport_error} || {http.reverse_proxy.status_code} == 502"
},
{
"expression": "method('POST') \u0026\u0026 {http.reverse_proxy.status_code} == 503"
},
{
"expression": "{http.reverse_proxy.status_code} == 504"
},
{
"expression": "{http.reverse_proxy.is_transport_error} \u0026\u0026 method('PUT')"
}
]
},
"upstreams": [
{
"dial": "127.0.0.1:65535"
}
]
}
]
}
]
}
}
}
}
}
147 changes: 147 additions & 0 deletions caddytest/integration/caddyfile_adapt/reverse_proxy_retry_match_response.caddyfiletest
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Original file line number Diff line number Diff line change
@@ -0,0 +1,147 @@
: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"
}
]
}
]
}
]
}
}
}
}
}
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