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606 lines
22 KiB
Markdown
---
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title: traffic-split
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---
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<!--
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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## 目录
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- [名字](#名字)
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- [属性](#属性)
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- [如何启用](#如何启用)
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- [示例](#示例)
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- [灰度发布](#灰度发布)
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- [蓝绿发布](#蓝绿发布)
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- [自定义发布](#自定义发布)
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- [匹配规则与上游对应](#匹配规则与上游对应)
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- [禁用插件](#禁用插件)
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## 名字
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traffic-split 插件使用户可以逐步引导各个上游之间的流量百分比。
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注:由于加权循环算法(特别是在重置wrr状态时)的缺点,因此每个上游之间的比率可能不太准确。
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## 属性
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| 参数名 | 类型 | 可选项 | 默认值 | 有效值 | 描述 |
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| ---------------------- | --------------| ------ | ------ | ------ | -------------------- |
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| rules.match | array[object] | 可选 | | | 匹配规则列表,默认为空且规则将被无条件执行。 |
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| rules.match.vars | array[array] | 可选 | | | 由一个或多个{var, operator, val}元素组成的列表,类似这样:{{var, operator, val}, {var, operator, val}, ...}}。例如:{"arg_name", "==", "json"},表示当前请求参数 name 是 json。这里的 var 与 Nginx 内部自身变量命名是保持一致,所以也可以使用 request_uri、host 等;对于 operator 部分,目前已支持的运算符有 ==、~=、~~、>、<、in、has 和 ! 。操作符的具体用法请看 [lua-resty-expr](https://github.com/api7/lua-resty-expr#operator-list) 的 `operator-list` 部分。 |
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| rules.weighted_upstreams | array[object] | 可选 | | | 上游配置规则列表。 |
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| weighted_upstreams.upstream_id | string / integer | 可选 | | | 通过上游 id 绑定对应上游。 |
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| weighted_upstreams.upstream | object | 可选 | | | 上游配置信息。 |
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| upstream.type | enum | 可选 | roundrobin | [roundrobin, chash] | roundrobin 支持权重的负载,chash 一致性哈希,两者是二选一。 |
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| upstream.hash_on | enum | 可选 | vars | | `hash_on` 支持的类型有 `vars`(Nginx 内置变量),`header`(自定义 header),`cookie`,`consumer`,`vars_combinations`,默认值为 `vars`。更多详细信息请参考 [upstream](../admin-api.md#upstream) 用法。|
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| upstream.key | string | 可选 | | | 该选项只有类型是 `chash` 才有效。根据 `key` 来查找对应的 node `id`,相同的 `key` 在同一个对象中,永远返回相同 id。更多详细信息请参考 [upstream](../admin-api.md#upstream) 用法。 |
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| upstream.nodes | object | 可选 | | | 哈希表,内部元素的 key 是上游机器地址 列表,格式为地址 + Port,其中地址部 分可以是 IP 也可以是域名,⽐如 192.168.1.100:80、foo.com:80等。 value 则是节点的权重,特别的,当权重 值为 0 有特殊含义,通常代表该上游节点 失效,永远不希望被选中。 |
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| upstream.timeout | object | 可选 | 15 | | 设置连接、发送消息、接收消息的超时时间(时间单位:秒,都默认为 15 秒)。 |
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| upstream.pass_host | enum | 可选 | "pass" | ["pass", "node", "rewrite"] | `pass`: 将客户端的 host 透传给上游; `node`: 使用 `upstream` node 中配置的 host; `rewrite`: 使用配置项 `upstream_host` 的值 |
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| upstream.name | string | 可选 | | | 标识上游服务名称、使⽤场景等。 |
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| upstream.upstream_host | string | 可选 | | | 只在 pass_host 配置为 rewrite 时有效。 |
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| weighted_upstreams.weight | integer | 可选 | weight = 1 | | 根据 `weight` 值做流量划分,多个 weight 之间使用 roundrobin 算法划分。|
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目前在 `weighted_upstreams.upstream` 的配置中,不支持的字段有:
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service_name、discovery_type、checks、retries、desc、scheme、labels、create_time 和 update_time。但是你可以通过 `weighted_upstreams.upstream_id` 绑定 `upstream` 对象来实现他们。
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traffic-split 插件主要由 `match` 和 `weighted_upstreams` 两部分组成,`match` 是自定义的条件规则,`weighted_upstreams` 是 upstream 的配置信息。如果配置 `match` 和 `weighted_upstreams` 信息,那么在 `match` 规则校验通过后,会根据 `weighted_upstreams` 中的 `weight` 值;引导插件中各个 upstream 之间的流量比例,否则,所有流量直接到达 `route` 或 `service` 上配置的 `upstream`。当然你也可以只配置 `weighted_upstreams` 部分,这样会直接根据 `weighted_upstreams` 中的 `weight` 值,引导插件中各个 upstream 之间的流量比例。
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注:1、在 `match` 里,vars 中的表达式是 `and` 的关系,多个 `vars` 之间是 `or` 的关系。2、在插件的 weighted_upstreams 域中,如果存在只有 `weight` 的结构,表示 `route` 或 `service` 上的 upstream 流量权重值。例如:
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```json
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"weighted_upstreams": [
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......
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{
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"weight": 2
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}
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]
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```
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## 如何启用
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创建一个路由并启用 `traffic-split` 插件,在配置插件上游信息时,有以下两种方式:
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1、通过插件中的 `upstream` 属性配置上游信息。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/index.html",
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"plugins": {
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"traffic-split": {
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"rules": [
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{
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"weighted_upstreams": [
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{
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"upstream": {
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"name": "upstream_A",
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1981":10
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},
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"timeout": {
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"connect": 15,
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"send": 15,
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"read": 15
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}
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},
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"weight": 1
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},
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{
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"weight": 1
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}
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]
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}
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]
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}
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1980": 1
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}
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}
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}'
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```
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2、通过插件中的 `upstream_id` 属性绑定上游服务。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/index.html",
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"plugins": {
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"traffic-split": {
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"rules": [
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{
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"weighted_upstreams": [
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{
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"upstream_id": 1,
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"weight": 1
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},
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{
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"weight": 1
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}
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]
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}
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]
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}
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1980": 1
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}
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}
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}'
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```
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>注:1、通过 `upstream_id` 方式来绑定已定义的上游,它可以复用上游具有的健康检测、重试等功能。2、支持 `upstream` 和 `upstream_id` 的两种配置方式一起使用。
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## 示例
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### 灰度发布
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缺少 `match` 规则部分,根据插件中 `weighted_upstreams` 配置的 `weight` 值做流量分流。将 `插件的 upstream` 与 `route 的 upstream` 按 3:2 的流量比例进行划分,其中 60% 的流量到达插件中的 `1981` 端口的 upstream, 40% 的流量到达 route 上默认 `1980` 端口的 upstream。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/index.html",
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"plugins": {
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"traffic-split": {
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"rules": [
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{
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"weighted_upstreams": [
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{
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"upstream": {
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"name": "upstream_A",
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1981":10
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},
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"timeout": {
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"connect": 15,
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"send": 15,
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"read": 15
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}
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},
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"weight": 3
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},
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{
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"weight": 2
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}
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]
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}
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]
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}
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1980": 1
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}
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}
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}'
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```
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**插件测试:**
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请求5次,3次请求命中插件1981端口的 upstream, 2次请求命中 `route` 的1980端口 upstream。
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```shell
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$ curl http://127.0.0.1:9080/index.html -i
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HTTP/1.1 200 OK
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Content-Type: text/html; charset=utf-8
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hello 1980
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$ curl http://127.0.0.1:9080/index.html -i
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HTTP/1.1 200 OK
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Content-Type: text/html; charset=utf-8
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world 1981
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......
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```
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### 蓝绿发布
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通过请求头获取 `match` 规则参数(也可以通过请求参数获取或NGINX变量),在 `match` 规则匹配通过后,表示所有请求都命中到插件配置的 upstream ,否则所以请求只命中 `route` 上配置的 upstream 。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/index.html",
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"plugins": {
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"traffic-split": {
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"rules": [
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{
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"match": [
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{
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"vars": [
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["http_release","==","new_release"]
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]
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}
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],
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"weighted_upstreams": [
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{
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"upstream": {
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"name": "upstream_A",
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1981":10
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}
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}
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}
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]
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}
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]
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}
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1980": 1
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}
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}
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}'
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```
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**插件测试:**
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`match` 规则匹配通过,所有请求都命中插件配置的1981端口 upstream :
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```shell
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$ curl http://127.0.0.1:9080/index.html -H 'release: new_release' -i
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HTTP/1.1 200 OK
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Content-Type: text/html; charset=utf-8
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......
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world 1981
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```
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`match` 规则匹配失败,所有请求都命中 `route` 上配置的 1980端口 upstream :
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```shell
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$ curl http://127.0.0.1:9080/index.html -H 'release: old_release' -i
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HTTP/1.1 200 OK
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Content-Type: text/html; charset=utf-8
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......
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hello 1980
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```
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### 自定义发布
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`match` 中可以设置多个 `vars` 规则,`vars` 中的多个表达式之间是 `add` 的关系, 多个 `vars` 规则之间是 `or` 的关系;只要其中一个 vars 规则通过,则整个 `match` 通过。
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**示例1:只配置了一个 `vars` 规则, `vars` 中的多个表达式是 `add` 的关系。在 `weighted_upstreams` 中根据 `weight` 值将流量按 3:2 划分,其中只有 `weight` 值的部分表示 `route` 上的 upstream 所占的比例。 当 `match` 匹配不通过时,所有的流量只会命中 route 上的 upstream 。**
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/index.html",
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"plugins": {
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"traffic-split": {
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"rules": [
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{
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"match": [
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{
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"vars": [
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["arg_name","==","jack"],
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["http_user-id",">","23"],
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["http_apisix-key","~~","[a-z]+"]
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]
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}
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],
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"weighted_upstreams": [
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{
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"upstream": {
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"name": "upstream_A",
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1981":10
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}
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},
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"weight": 3
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},
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{
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"weight": 2
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}
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]
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}
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]
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}
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1980": 1
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}
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}
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}'
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```
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插件设置了请求的 `match` 规则及端口为`1981`的 upstream,route 上具有端口为`1980`的 upstream。
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**插件测试:**
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>1、在 `match` 规则校验通过后, 60% 的请求命中到插件的1981端口的 upstream, 40% 的请求命中到 `route` 的1980端口的 upstream。
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match 规则校验成功, 命中端口为`1981`的 upstream。
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```shell
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$ curl 'http://127.0.0.1:9080/index.html?name=jack' -H 'user-id:30' -H 'apisix-key: hello' -i
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HTTP/1.1 200 OK
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Content-Type: text/html; charset=utf-8
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......
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world 1981
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```
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match 规则校验失败,,命中默认端口为`1980`的 upstream。
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```shell
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$ curl 'http://127.0.0.1:9080/index.html?name=jack' -H 'user-id:30' -H 'apisix-key: hello' -i
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HTTP/1.1 200 OK
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Content-Type: text/html; charset=utf-8
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......
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hello 1980
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```
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在请求5次后,3次命中 `1981` 端口的服务,2次命中 `1980` 端口的服务。
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>2、`match` 规则校验失败(缺少请求头 `apisix-key` ), 响应都为默认 upstream 的数据 `hello 1980`。
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```shell
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$ curl 'http://127.0.0.1:9080/index.html?name=jack' -H 'user-id:30' -i
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HTTP/1.1 200 OK
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Content-Type: text/html; charset=utf-8
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......
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hello 1980
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```
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**示例2:配置多个 `vars` 规则, `vars` 中的多个表达式是 `add` 的关系, 多个 `vars` 之间是 `or` 的关系。根据 `weighted_upstreams` 中的 `weight` 值将流量按 3:2 划分,其中只有 `weight` 值的部分表示 route 上的 upstream 所占的比例。 当 `match` 匹配不通过时,所有的流量只会命中 route 上的 upstream 。**
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/index.html",
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"plugins": {
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"traffic-split": {
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"rules": [
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{
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"match": [
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{
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"vars": [
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["arg_name","==","jack"],
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["http_user-id",">","23"],
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["http_apisix-key","~~","[a-z]+"]
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]
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},
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{
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"vars": [
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["arg_name2","==","rose"],
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["http_user-id2","!",">","33"],
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["http_apisix-key2","~~","[a-z]+"]
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]
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}
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],
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"weighted_upstreams": [
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{
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"upstream": {
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"name": "upstream_A",
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1981":10
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}
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},
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"weight": 3
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},
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{
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"weight": 2
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}
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]
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}
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]
|
||
}
|
||
},
|
||
"upstream": {
|
||
"type": "roundrobin",
|
||
"nodes": {
|
||
"127.0.0.1:1980": 1
|
||
}
|
||
}
|
||
}'
|
||
```
|
||
|
||
插件设置了请求的 `match` 规则及端口为`1981`的 upstream,route 上具有端口为`1980`的 upstream 。
|
||
|
||
**测试插件:**
|
||
|
||
>1、两个 `vars` 的表达式匹配成功, `match` 规则校验通过后, 60% 的请求命中到插件的1981端口 upstream, 40% 的请求命中到 `route` 的1980端口upstream。
|
||
|
||
```shell
|
||
$ curl 'http://127.0.0.1:9080/index.html?name=jack&name2=rose' -H 'user-id:30' -H 'user-id2:22' -H 'apisix-key: hello' -H 'apisix-key2: world' -i
|
||
HTTP/1.1 200 OK
|
||
Content-Type: text/html; charset=utf-8
|
||
......
|
||
|
||
world 1981
|
||
```
|
||
|
||
```shell
|
||
$ curl 'http://127.0.0.1:9080/index.html?name=jack&name2=rose' -H 'user-id:30' -H 'user-id2:22' -H 'apisix-key: hello' -H 'apisix-key2: world' -i
|
||
HTTP/1.1 200 OK
|
||
Content-Type: text/html; charset=utf-8
|
||
......
|
||
|
||
hello 1980
|
||
```
|
||
|
||
在请求5次后,3次命中 `1981` 端口的服务,2次命中 `1980` 端口的服务。
|
||
|
||
>2、第二个 `vars` 的表达式匹配失败(缺少 `name2` 请求参数),`match` 规则校验通过后, 60% 的请求命中到插件的1981端口 upstream, 40% 的请求流量命中到 `route` 的1980端口 upstream。
|
||
|
||
```shell
|
||
$ curl 'http://127.0.0.1:9080/index.html?name=jack' -H 'user-id:30' -H 'user-id2:22' -H 'apisix-key: hello' -H 'apisix-key2: world' -i
|
||
HTTP/1.1 200 OK
|
||
Content-Type: text/html; charset=utf-8
|
||
......
|
||
|
||
world 1981
|
||
```
|
||
|
||
```shell
|
||
$ curl 'http://127.0.0.1:9080/index.html?name=jack' -H 'user-id:30' -H 'user-id2:22' -H 'apisix-key: hello' -H 'apisix-key2: world' -i
|
||
HTTP/1.1 200 OK
|
||
Content-Type: text/html; charset=utf-8
|
||
......
|
||
|
||
hello 1980
|
||
```
|
||
|
||
在请求5次后,3次命中 `1981` 端口的服务,2次命中 `1980` 端口的服务。
|
||
|
||
>3、两个 `vars` 的表达式校验失败(缺少 `name` 和 `name2` 请求参数),`match` 规则校验失败, 响应都为默认 `route` 的 upstream 数据 `hello 1980`。
|
||
|
||
```shell
|
||
$ curl 'http://127.0.0.1:9080/index.html?name=jack' -i
|
||
HTTP/1.1 200 OK
|
||
Content-Type: text/html; charset=utf-8
|
||
......
|
||
|
||
hello 1980
|
||
```
|
||
|
||
### 匹配规则与上游对应
|
||
|
||
通过配置多个 `rules`,我们可以实现不同的匹配规则与上游一一对应。
|
||
|
||
**示例:**
|
||
|
||
当请求头 `x-api-id` 等于 1 时,命中 1981 端口的上游;当 `x-api-id` 等于 2 时,命中 1982 端口的上游;否则,命中 1980 端口的上游(上游响应数据为对应的端口号)。
|
||
|
||
```shell
|
||
curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
|
||
{
|
||
"uri": "/hello",
|
||
"plugins": {
|
||
"traffic-split": {
|
||
"rules": [
|
||
{
|
||
"match": [
|
||
{
|
||
"vars": [
|
||
["http_x-api-id","==","1"]
|
||
]
|
||
}
|
||
],
|
||
"weighted_upstreams": [
|
||
{
|
||
"upstream": {
|
||
"name": "upstream-A",
|
||
"type": "roundrobin",
|
||
"nodes": {
|
||
"127.0.0.1:1981":1
|
||
}
|
||
},
|
||
"weight": 3
|
||
}
|
||
]
|
||
},
|
||
{
|
||
"match": [
|
||
{
|
||
"vars": [
|
||
["http_x-api-id","==","2"]
|
||
]
|
||
}
|
||
],
|
||
"weighted_upstreams": [
|
||
{
|
||
"upstream": {
|
||
"name": "upstream-B",
|
||
"type": "roundrobin",
|
||
"nodes": {
|
||
"127.0.0.1:1982":1
|
||
}
|
||
},
|
||
"weight": 3
|
||
}
|
||
]
|
||
}
|
||
]
|
||
}
|
||
},
|
||
"upstream": {
|
||
"type": "roundrobin",
|
||
"nodes": {
|
||
"127.0.0.1:1980": 1
|
||
}
|
||
}
|
||
}'
|
||
```
|
||
|
||
**测试插件:**
|
||
|
||
请求头 `x-api-id` 等于 1,命中带 1981 端口的上游。
|
||
|
||
```shell
|
||
$ curl http://127.0.0.1:9080/hello -H 'x-api-id: 1'
|
||
1981
|
||
```
|
||
|
||
请求头 `x-api-id` 等于 2,命中带 1982 端口的上游。
|
||
|
||
```shell
|
||
$ curl http://127.0.0.1:9080/hello -H 'x-api-id: 2'
|
||
1982
|
||
```
|
||
|
||
请求头 `x-api-id` 等于 3,规则不匹配,命中带 1980 端口的上游。
|
||
|
||
```shell
|
||
$ curl http://127.0.0.1:9080/hello -H 'x-api-id: 3'
|
||
1980
|
||
```
|
||
|
||
## 禁用插件
|
||
|
||
当你想去掉 traffic-split 插件的时候,很简单,在插件的配置中把对应的 json 配置删除即可,无须重启服务,即刻生效:
|
||
|
||
```shell
|
||
$ curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
|
||
{
|
||
"uri": "/index.html",
|
||
"plugins": {},
|
||
"upstream": {
|
||
"type": "roundrobin",
|
||
"nodes": {
|
||
"127.0.0.1:1980": 1
|
||
}
|
||
}
|
||
}'
|
||
```
|