# Rate limiting v2 ## Introduction Based on traffic marker, this rate limiter can limit traffic rate

## Usage it allows you to define a list of rate limit policy. each policy is defined as a yaml value, the yaml key path is servicecomb.rateLimiting.{policy_name}. match > (required, string) match policy name, if you want to limit un-marked traffic, use “none”

rate > (required, int) allowed request in second > burst > (required, int) if traffic rate reached rate limit. still allow n(burst) request going through > > Import middleware `go import _ github.com/go-chassis/go-chassis/v2/middleware/ratelimiter `

Add marker and limiter to handler ```yaml servicecomb:

handler:

chain:

Provider:

default: traffic-marker,rate-limiter

``` #### Example ```yaml servicecomb:

match:

traffic-to-some-api-from-jack: |

headers:

cookie:

regex: “^(.*?;)?(user=jack)(;.*)?$”

os:

contains: linux

apiPath:

exact: “/some/api”

method: GET trafficMarkPolicy: once

rateLimiting:

limiterPolicy1: |

match: traffic-to-some-api-from-jack rate: 10 burst: 1

nonMarked: |

match: none rate: 100 burst: 1

```