mirror of
https://gitee.com/iresty/apisix.git
synced 2024-12-15 01:11:58 +08:00
147 lines
4.9 KiB
Markdown
147 lines
4.9 KiB
Markdown
<!--
|
||
#
|
||
# Licensed to the Apache Software Foundation (ASF) under one or more
|
||
# contributor license agreements. See the NOTICE file distributed with
|
||
# this work for additional information regarding copyright ownership.
|
||
# The ASF licenses this file to You under the Apache License, Version 2.0
|
||
# (the "License"); you may not use this file except in compliance with
|
||
# the License. You may obtain a copy of the License at
|
||
#
|
||
# http://www.apache.org/licenses/LICENSE-2.0
|
||
#
|
||
# Unless required by applicable law or agreed to in writing, software
|
||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
# See the License for the specific language governing permissions and
|
||
# limitations under the License.
|
||
#
|
||
-->
|
||
|
||
[English](proxy-cache.md)
|
||
|
||
# proxy-cache
|
||
|
||
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。
|
||
|
||
基于磁盘的缓存需要注意:
|
||
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
|
||
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
|
||
|
||
### 参数
|
||
|
||
|名称 |必须|类型|描述|
|
||
|------- |-----|------|------|
|
||
|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|
|
||
|cache_key|是|array[string]|缓存key,可以使用变量。例如:["$host", "$uri", "-cache-id"]|
|
||
|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:["$arg_bypass"]|
|
||
|cache_method|否|array[string]|根据请求method决定是否需要缓存|
|
||
|cache_http_status|否|array[integer]|根据响应码决定是否需要缓存|
|
||
|hide_cache_headers|否|boolean|是否将 Expires 和 Cache-Control 响应头返回给客户端,默认为 false|
|
||
|no_cache|否|array[string]|是否缓存数据,可以使用变量,需要注意当此参数的值不为空或非'0'时将不会缓存数据。|
|
||
|
||
注:变量以$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。
|
||
|
||
### 示例
|
||
|
||
#### 启用插件
|
||
|
||
示例1:为特定路由启用 `proxy-cache` 插件:
|
||
|
||
```shell
|
||
curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
|
||
{
|
||
"plugins": {
|
||
"proxy-cache": {
|
||
"cache_zone": "disk_cache_one",
|
||
"cache_key": ["$uri", "-cache-id"],
|
||
"cache_bypass": ["$arg_bypass"],
|
||
"cache_method": ["GET"],
|
||
"cache_http_status": [200],
|
||
"hide_cache_headers": true,
|
||
"no_cache": ["$arg_test"]
|
||
}
|
||
},
|
||
"upstream": {
|
||
"nodes": {
|
||
"127.0.0.1:1999": 1
|
||
},
|
||
"type": "roundrobin"
|
||
},
|
||
"uri": "/hello"
|
||
}'
|
||
```
|
||
|
||
测试:
|
||
|
||
```shell
|
||
$ curl http://127.0.0.1:9080/hello -i
|
||
HTTP/1.1 200 OK
|
||
Content-Type: application/octet-stream
|
||
Content-Length: 6
|
||
Connection: keep-alive
|
||
Server: APISIX web server
|
||
Date: Tue, 03 Mar 2020 10:45:36 GMT
|
||
Last-Modified: Tue, 03 Mar 2020 10:36:38 GMT
|
||
Apisix-Cache-Status: MISS
|
||
|
||
hello
|
||
```
|
||
|
||
> http status 返回`200`并且响应头中包含`Apisix-Cache-Status`,表示该插件已启用。
|
||
|
||
示例2:验证文件是否被缓存,再次请求上边的地址:
|
||
|
||
测试:
|
||
|
||
```shell
|
||
$ curl http://127.0.0.1:9080/hello -i
|
||
HTTP/1.1 200 OK
|
||
Content-Type: application/octet-stream
|
||
Content-Length: 6
|
||
Connection: keep-alive
|
||
Server: APISIX web server
|
||
Date: Tue, 03 Mar 2020 11:14:46 GMT
|
||
Last-Modified: Thu, 20 Feb 2020 14:21:41 GMT
|
||
Apisix-Cache-Status: HIT
|
||
|
||
hello
|
||
```
|
||
|
||
> 响应头 Apisix-Cache-Status 值变为了 HIT,说明文件已经被缓存
|
||
|
||
示例3:如何清理缓存的文件,只需要指定请求的 method 为 PURGE:
|
||
|
||
测试:
|
||
|
||
```shell
|
||
$ curl -i http://127.0.0.1:9080/hello -X PURGE
|
||
HTTP/1.1 200 OK
|
||
Date: Tue, 03 Mar 2020 11:17:35 GMT
|
||
Content-Type: text/plain
|
||
Transfer-Encoding: chunked
|
||
Connection: keep-alive
|
||
Server: APISIX web server
|
||
```
|
||
|
||
> 响应码为200即表示删除成功,如果文件未找到将返回404
|
||
|
||
#### 禁用插件
|
||
|
||
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:
|
||
|
||
```shell
|
||
curl http://127.0.0.1:9080/apisix/admin/routes/1 -X PUT -d '
|
||
{
|
||
"uri": "/hello",
|
||
"plugins": {},
|
||
"upstream": {
|
||
"type": "roundrobin",
|
||
"nodes": {
|
||
"127.0.0.1:1999": 1
|
||
}
|
||
}
|
||
}'
|
||
```
|
||
|
||
这时该插件已被禁用。
|