[GitHub] [apisix] tokers commented on a change in pull request #4321: docs(ext-plugin): init docs

[GitBox <gi...@apache.org>]

tokers commented on a change in pull request #4321:
URL: https://github.com/apache/apisix/pull/4321#discussion_r642031556



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File path: docs/en/latest/external-plugin.md
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@@ -0,0 +1,91 @@
+---
+title: external plugin
+---
+
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+
+## What are external plugin and plugin runner
+
+APISIX supports writing plugins in Lua. This type of plugins will be executed
+inside APISIX. Sometimes you want to develop plugin in other languages, so APISIX
+provides sidecars that loading your plugins and run them when the requests hit
+APISIX. These sidecars are called plugin runners and your plugins are called
+external plugins.
+
+## How does it work
+
+![external-plugin](../../../assets/images/external-plugin.png)
+
+When you configure a plugin runner in APISIX, APISIX will run the plugin runner
+as a subprocess. The process will belong to the same user of the APISIX
+process. When we restart or reload APISIX, the plugin runner will be restarted too.
+
+Once you have configured `ext-plugin-*` plugins for a given route, the requests
+which hit the route will trigger RPC call from APISIX to the plugin runner via
+unix socket.
+
+The plugin runner will handle the PRC call, create a fake request at its side,

Review comment:
       ```suggestion
   The plugin runner will handle the RPC call, create a fake request at its side,
   ```




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