Plugin write-server-ip Spec

Overview

This plugin inserts a MY_HDR field in the server response header, gets it from the cache when the client sends the same request again and prints the MY_HDR field values to a text file.

Plugin Description

In TSPluginInit(), the plugin registers a handler function on HTTP global hook TS_HTTP_TXN_START_HOOK. On this hook, it registers handler functions on two transaction hooks:

• TS_HTTP_READ_RESPONSE_HDR_HOOK
• TS_HTTP_READ_CACHE_HDR_HOOK

The handler function on TS_HTTP_READ_RESPONSE_HDR_HOOK gets server ip, request method, next hop ip, client incoming port and parent proxy from the transaction. It then creates a new http header field MY_HDR in the server response and inserts all the above information into the field as field values.

The server response should be in the cache after the client sends the request for the first time. When the client sends the same request the second time, the handler function on the TS_HTTP_READ_CACHE_HDR_HOOK gets the header field MY_HDR from the caches response header, prints it out to a text file plugin_dir/write_server_ip.txt.