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147 lines
4.9 KiB
Markdown
147 lines
4.9 KiB
Markdown
<!--
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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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[English](proxy-cache.md)
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# proxy-cache
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代理缓存插件，该插件提供缓存后端响应数据的能力，它可以和其他插件一起使用。该插件支持基于磁盘的缓存，未来也会支持基于内存的缓存。目前可以根据响应码、请求 Method 来指定需要缓存的数据，另外也可以通过 no_cache 和 cache_bypass 配置更复杂的缓存策略。
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基于磁盘的缓存需要注意：
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1. 不能动态配置缓存的过期时间，只能通过后端服务响应头 Expires 或 Cache-Control 来设置过期时间，如果后端响应头中没有 Expires 或 Cache-Control，那么 APISIX 将默认只缓存10秒钟
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2. 如果后端服务不可用， APISIX 将返回502或504，那么502或504将被缓存10秒钟
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### 参数
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|名称 |必须|类型|描述|
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|------- |-----|------|------|
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|cache_zone|是|string|指定使用哪个缓存区域，不同的缓存区域可以配置不同的路径，在conf/config.yaml文件中可以预定义使用的缓存区域|
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|cache_key|是|array[string]|缓存key，可以使用变量。例如：["$host", "$uri", "-cache-id"]|
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|cache_bypass|否|array[string]|是否跳过缓存检索，即不在缓存中查找数据，可以使用变量，需要注意当此参数的值不为空或非'0'时将会跳过缓存的检索。例如：["$arg_bypass"]|
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|cache_method|否|array[string]|根据请求method决定是否需要缓存|
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|cache_http_status|否|array[integer]|根据响应码决定是否需要缓存|
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|hide_cache_headers|否|boolean|是否将 Expires 和 Cache-Control 响应头返回给客户端，默认为 false|
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|no_cache|否|array[string]|是否缓存数据，可以使用变量，需要注意当此参数的值不为空或非'0'时将不会缓存数据。|
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注：变量以$开头，也可以使用变量和字符串的结合，但是需要以数组的形式分开写，最终变量被解析后会和字符串拼接在一起。
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### 示例
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#### 启用插件
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示例1：为特定路由启用 `proxy-cache` 插件：
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
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{
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"plugins": {
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"proxy-cache": {
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"cache_zone": "disk_cache_one",
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"cache_key": ["$uri", "-cache-id"],
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"cache_bypass": ["$arg_bypass"],
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"cache_method": ["GET"],
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"cache_http_status": [200],
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"hide_cache_headers": true,
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"no_cache": ["$arg_test"]
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1999": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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测试：
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```shell
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$ curl http://127.0.0.1:9080/hello -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Content-Length: 6
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Connection: keep-alive
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Server: APISIX web server
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Date: Tue, 03 Mar 2020 10:45:36 GMT
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Last-Modified: Tue, 03 Mar 2020 10:36:38 GMT
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Apisix-Cache-Status: MISS
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hello
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```
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> http status 返回`200`并且响应头中包含`Apisix-Cache-Status`，表示该插件已启用。
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示例2：验证文件是否被缓存，再次请求上边的地址：
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测试：
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```shell
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$ curl http://127.0.0.1:9080/hello -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Content-Length: 6
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Connection: keep-alive
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Server: APISIX web server
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Date: Tue, 03 Mar 2020 11:14:46 GMT
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Last-Modified: Thu, 20 Feb 2020 14:21:41 GMT
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Apisix-Cache-Status: HIT
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hello
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```
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> 响应头 Apisix-Cache-Status 值变为了 HIT，说明文件已经被缓存
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示例3：如何清理缓存的文件，只需要指定请求的 method 为 PURGE：
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测试：
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```shell
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$ curl -i http://127.0.0.1:9080/hello -X PURGE
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HTTP/1.1 200 OK
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Date: Tue, 03 Mar 2020 11:17:35 GMT
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Content-Type: text/plain
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Transfer-Encoding: chunked
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Connection: keep-alive
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Server: APISIX web server
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```
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> 响应码为200即表示删除成功，如果文件未找到将返回404
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#### 禁用插件
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移除插件配置中相应的 JSON 配置可立即禁用该插件，无需重启服务：
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
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{
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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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"127.0.0.1:1999": 1
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}
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}
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}'
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```
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这时该插件已被禁用。
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