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doc: plugin attributes format unification (#2278 )

* [WIP] doc api unify

* [WIP] doc api unify

* doc api format

* fix typo

2020-09-23 08:11:27 +08:00

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中文

Summary

Name
Attributes
How To Enable
Test Plugin
Disable Plugin

Name

limit request rate using the "leaky bucket" method.

Attributes

Name	Type	Requirement	Default	Valid	Description
rate	integer	required		[0,...]	the specified request rate (number per second) threshold. Requests exceeding this rate (and below `burst`) will get delayed to conform to the rate.
burst	integer	required		[0,...]	the number of excessive requests per second allowed to be delayed. Requests exceeding this hard limit will get rejected immediately.
key	string	required		["remote_addr", "server_addr", "http_x_real_ip", "http_x_forwarded_for"]	the user specified key to limit the rate, now accept those as key: "remote_addr"(client's IP), "server_addr"(server's IP), "X-Forwarded-For/X-Real-IP" in request header.
rejected_code	string	optional	503	[200,...]	The HTTP status code returned when the request exceeds the threshold is rejected. The default is 503.

Key can be customized by the user, only need to modify a line of code of the plug-in to complete. It is a security consideration that is not open in the plugin.

How To Enable

Here's an example, enable the limit req plugin on the specified route:

curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/index.html",
    "plugins": {
        "limit-req": {
            "rate": 1,
            "burst": 2,
            "rejected_code": 503,
            "key": "remote_addr"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "39.97.63.215:80": 1
        }
    }
}'

You can open dashboard with a browser: http://127.0.0.1:9080/apisix/dashboard/, to complete the above operation through the web interface, first add a route:

Then add limit-req plugin:

Test Plugin

The above configuration limits the request rate to 1 per second. If it is greater than 1 and less than 3, the delay will be added. If the rate exceeds 3, it will be rejected:

curl -i http://127.0.0.1:9080/index.html

When you exceed, you will receive a response header with a 503 return code:

HTTP/1.1 503 Service Temporarily Unavailable
Content-Type: text/html
Content-Length: 194
Connection: keep-alive
Server: APISIX web server

<html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body>
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>openresty</center>
</body>
</html>

This means that the limit req plugin is in effect.

Disable Plugin

When you want to disable the limit req plugin, it is very simple, you can delete the corresponding json configuration in the plugin configuration, no need to restart the service, it will take effect immediately:

curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/index.html",
    "id": 1,
    "plugins": {
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "39.97.63.215:80": 1
        }
    }
}'

The limit req plugin has been disabled now. It works for other plugins.

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