apisix/doc/plugins/fault-injection.md

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# [Chinese](fault-injection-cn.md)
## Name
Fault injection plugin, this plugin can be used with other plugins and will be executed before other plugins. The `abort` attribute will directly return the user-specified http code to the client and terminate the subsequent plugins. The `delay` attribute will delay a request and execute subsequent plugins.
## Attributes
|Name |Requirement |Description|
|------- |-----|------|
|abort.http_status|required|user-specified http code returned to the client|
|abort.body|optional|response data returned to the client|
|delay.duration|required|delay time(can be decimal)|
Note: `abort` and `delay` must have at least one.
## How To Enable
### Enable the plugin
1: enable the fault-injection plugin for a specific route and specify the abort attribute
```shell
curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"plugins": {
"fault-injection": {
"abort": {
"http_status": 200,
"body": "Fault Injection!"
}
}
},
"upstream": {
"nodes": {
"127.0.0.1:1980": 1
},
"type": "roundrobin"
},
"uri": "/hello"
}'
```
Test plugin
```shell
$ curl http://127.0.0.1:9080/hello -i
HTTP/1.1 200 OK
Date: Mon, 13 Jan 2020 13:50:04 GMT
Content-Type: text/plain
Transfer-Encoding: chunked
Connection: keep-alive
Server: APISIX web server
Fault Injection!
```
> http status is 200 and the response body is "Fault Injection! " indicate that the plugin is enabled.
2: Enable the `fault-injection` plugin for a specific route and specify the `delay` attribute:
```shell
curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"plugins": {
"fault-injection": {
"delay": {
"duration": 3
}
}
},
"upstream": {
"nodes": {
"127.0.0.1:1980": 1
},
"type": "roundrobin"
},
"uri": "/hello"
}'
```
Test plugin
```shell
$ time curl http://127.0.0.1:9080/hello -i
HTTP/1.1 200 OK
Content-Type: application/octet-stream
Content-Length: 6
Connection: keep-alive
Server: APISIX web server
Date: Tue, 14 Jan 2020 14:30:54 GMT
Last-Modified: Sat, 11 Jan 2020 12:46:21 GMT
hello
real 0m3.034s
user 0m0.007s
sys 0m0.010s
```
## Disable Plugin
Remove the corresponding JSON in the plugin configuration to disable the plugin immediately without restarting the service:
```shell
curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/hello",
"plugins": {},
"upstream": {
"type": "roundrobin",
"nodes": {
"127.0.0.1:1980": 1
}
}
}'
```
The plugin has been disabled now.