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66539b36e7
* support conditinal response rewrite * fix code style * fix typo * fix typo * fix test case * add test case and fix code style * drop space * add fail test cases * enhance docs
129 lines
5.2 KiB
Markdown
129 lines
5.2 KiB
Markdown
---
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title: response-rewrite
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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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## 目录
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- [**response-rewrite**](#response-rewrite)
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- [**配置参数**](#配置参数)
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- [**开启插件**](#开启插件)
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- [**测试插件**](#测试插件)
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- [**禁用插件**](#禁用插件)
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- [**注意事项**](#注意事项)
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## response-rewrite
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该插件支持修改上游服务或网关本身返回的 body 和 header 信息。
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使用场景：
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1、可以设置 `Access-Control-Allow-*` 等 header 信息，来实现 CORS （跨域资源共享）的功能。
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2、另外也可以通过配置 status_code 和 header 里面的 Location 来实现重定向，当然如果只是需要重定向功能，最好使用 [redirect](redirect.md) 插件。
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## 配置参数
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| 名称 | 类型 | 必选项 | 默认值 | 有效值 | 描述 |
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| ----------- | ------- | ------ | ------ | ---------- | -------------------------------------------------------------------------------------------------------------------------------------- |
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| status_code | integer | 可选 | | [200, 598] | 修改上游返回状态码，默认保留原始响应代码。 |
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| body | string | 可选 | | | 修改上游返回的 `body` 内容，如果设置了新内容，header 里面的 content-length 字段也会被去掉 |
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| body_base64 | boolean | 可选 | false | | 描述 `body` 字段是否需要 base64 解码之后再返回给客户端，用在某些图片和 Protobuffer 场景 |
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| headers | object | 可选 | | | 返回给客户端的 `headers`，这里可以设置多个。头信息如果存在将重写，不存在则添加。想要删除某个 header 的话，把对应的值设置为空字符串即可 |
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| vars | array[] | 可选 | | | `vars` 是一个表达式列表，只有满足条件的请求和响应才会修改 body 和 header 信息，来自 [lua-resty-expr](https://github.com/api7/lua-resty-expr#operator-list)。如果 `vars` 字段为空，那么所有的重写动作都会被无条件的执行。 |
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## 示例
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### 开启插件
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下面是一个示例，在指定的 route 上开启了 `response rewrite` 插件：
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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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"methods": ["GET"],
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"uri": "/test/index.html",
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"plugins": {
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"response-rewrite": {
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"body": "{\"code\":\"ok\",\"message\":\"new json body\"}",
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"headers": {
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"X-Server-id": 3,
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"X-Server-status": "on"
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},
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"vars":[
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[ "status","==","200" ]
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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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"127.0.0.1:80": 1
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}
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}
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}'
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```
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### 测试插件
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基于上述配置进行测试：
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```shell
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curl -X GET -i http://127.0.0.1:9080/test/index.html
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```
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如果看到返回的头部信息和内容都被修改了，即表示 `response rewrite` 插件生效了,`vars` 将确保仅覆盖状态为 200 的响应。
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```shell
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HTTP/1.1 200 OK
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Date: Sat, 16 Nov 2019 09:15:12 GMT
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Transfer-Encoding: chunked
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Connection: keep-alive
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X-Server-id: 3
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X-Server-status: on
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{"code":"ok","message":"new json body"}
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```
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### 禁用插件
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禁用`response-rewrite`插件很简单。你不需要重新启动服务，只需要在插件配置中删除相应的 json 配置，它将立即生效。
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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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"methods": ["GET"],
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"uri": "/test/index.html",
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:80": 1
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}
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}
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}'
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```
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## 注意事项
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`ngx.exit`将中断当前请求的执行，并返回状态码给 Nginx。
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但是很多人可能会对`ngx.exit`理解出现偏差，即如果你在`access`阶段执行`ngx.exit`，只是中断了请求处理阶段，响应阶段仍然会处理。比如，如果你配置了`response-rewrite`插件，它会强制覆盖你的响应信息（如响应代码）。
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