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104 lines
3.3 KiB
Markdown
104 lines
3.3 KiB
Markdown
---
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title: echo
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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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-->
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## Summary
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- [**Name**](#name)
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- [**Attributes**](#attributes)
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- [**How To Enable**](#how-to-enable)
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- [**Test Plugin**](#test-plugin)
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- [**Disable Plugin**](#disable-plugin)
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## Name
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`echo` is a useful plugin to help users understand as fully as possible how to develop an APISIX plugin.
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This plugin addresses the corresponding functionality in the common phases such as init, rewrite, access, balancer, header filter, body filter and log.
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**NOTE: `echo` plugin is written as an example. There are some unhandled cases and you should not use it in the production!**
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## Attributes
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| Name | Type | Requirement | Default | Valid | Description |
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| ----------- | ------ | ----------- | ------- | ----- | -------------------------------------------- |
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| before_body | string | optional | | | Body before the filter phase. |
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| body | string | optional | | | Body to replace upstream response. |
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| after_body | string | optional | | | Body after the modification of filter phase. |
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| headers | object | optional | | | New headers for response |
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| auth_value | string | optional | | | Auth value |
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At least one of `before_body`, `body`, and `after_body` must be specified.
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## How To Enable
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The following is an example on how to enable the echo plugin for a specific route.
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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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"plugins": {
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"echo": {
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"before_body": "before the body modification "
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1980": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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## Test Plugin
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* success:
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```shell
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$ curl -i http://127.0.0.1:9080/hello
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HTTP/1.1 200 OK
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...
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before the body modification hello world
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```
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## Disable Plugin
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Remove the corresponding json configuration in the plugin configuration to disable the `echo`.
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APISIX plugins are hot-reloaded, therefore no need to restart APISIX.
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```shell
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$ curl http://127.0.0.1:2379/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d value='
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{
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"methods": ["GET"],
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"uri": "/hello",
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"plugins": {},
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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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