Add support of additional %UPSTREAM% variables to custom headers · envoyproxy/envoy#13897 | Good First Issue

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area/httpdesign proposalhelp wanted

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描述

One of our customers is using the Envoy tap filter to retrieve transport information and add them to their request/response headers, as documented here : https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_conn_man/headers.html#custom-request-response-headers

At this point, very few %UPSTREAM% variable names are supported : %UPSTREAM_METADATA([“namespace”, “key”, …])% %UPSTREAM_REMOTE_ADDRESS%

They wish additional %UPSTREAM% variables were supported, such as %UPSTREAM_LOCAL_ADDRESS%.

Thanks !

贡献者指南

研究方向: 查看Envoy中现有的变量扩展代码（可能在source/common/http/header formatter.cc或类似文件中），了解当前%UPSTREAM ...%变量是如何处理的，然后按照相同模式添加对新变量（如%UPSTREAM LOCAL ADDRESS%）的支持。
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