Docs(proxy-cache): Improve description of vary_query_params #13585
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…n lua_max_post_args
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Summary
A customer encountered an issue with the Proxy Cache and Proxy Cache Advanced plugins when sending requests with more than 100 query parameters. They weren't aware that the params were limited by the lua_max_uri_args parameter.
Updating the description of vary_query_params to mention the dependency on lua_max_uri_args so that users can more easily troubleshoot issues with this plugin.
Parallel PR in kong repo for Proxy Cache Advanced: https://github.com/Kong/kong-ee/pull/10131
https://konghq.atlassian.net/browse/DOCU-4043
Checklist
changelog/unreleased/kongorskip-changeloglabel added on PR if changelog is unnecessary. README.md