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Version: Next

proxy-mirror

Description#

The proxy-mirror Plugin can be used to mirror client requests. Traffic mirroring duplicates the real online traffic to the mirroring service. This enables specific analysis of the online traffic or request content without interrupting the online service.

note

The response returned by the mirror request is ignored.

Attributes#

NameTypeRequiredDefaultValid valuesDescription
hoststringTrueAddress of the mirror service. It needs to contain the scheme but without the path. For example, http://127.0.0.1:9797.
pathstringFalsePath of the mirror request. If unspecified, current path will be used.
sample_rationumberFalse1[0.00001, 1]Ratio of the requests that will be mirrored.

You can customize the proxy timeouts for the mirrored sub-requests by configuring the plugin_attr key in your configuration file (conf/config.yaml). This can be used for mirroring traffic to a slow backend.

conf/config.yaml
plugin_attr:
proxy-mirror:
timeout:
connect: 2000ms
read: 2000ms
send: 2000ms
NameTypeDefaultDescription
connectstring60sConnect timeout to the mirrored Upstream.
readstring60sRead timeout to the mirrored Upstream.
sendstring60sSend timeout to the mirrored Upstream.

Enabling the Plugin#

You can enable the Plugin on a specific Route as shown below:

curl http://127.0.0.1:9180/apisix/admin/routes/1  \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"plugins": {
"proxy-mirror": {
"host": "http://127.0.0.1:9797"
}
},
"upstream": {
"nodes": {
"127.0.0.1:1999": 1
},
"type": "roundrobin"
},
"uri": "/hello"
}'

Specify the timeout for mirror subrequests#

We can specify the timeout for subrequests in plugin_attr in conf/config.yaml. This is useful in connection reuse scenarios when mirroring traffic to a very slow backend service.

Since mirror requests are implemented as sub-requests, delays in sub-requests will block the original request until the sub-requests are completed. So you can configure the timeout time to protect the sub-requests from excessive delays that affect the original requests.

NameTypeDefaultDescription
connectstring60sConnection timeout for mirror request to upstream.
readstring60sThe time that APISIX maintains the connection with the mirror server; if APISIX does not receive a response from the mirror server within this time, the connection is closed.
sendstring60sThe time that APISIX maintains the connection with the mirror server; if APISIX does not send a request within this time, the connection is closed.
plugin_attr:
proxy-mirror:
timeout:
connect: 2000ms
read: 2000ms
send: 2000ms

Example usage#

tip

For testing you can create a test server by running:

python -m http.server 9797

Once you have configured the Plugin as shown above, the requests made will be mirrored to the configured host.

curl http://127.0.0.1:9080/hello -i
HTTP/1.1 200 OK
...
hello world

Disable Plugin#

To disable the proxy-mirror Plugin, you can delete the corresponding JSON configuration from the Plugin configuration. APISIX will automatically reload and you do not have to restart for this to take effect.

curl http://127.0.0.1:9180/apisix/admin/routes/1 \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/hello",
"plugins": {},
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1999": 1
}
}
}'