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J. Nick Koston
8120bd373c
Replace heavy STL containers with simple std::vector and linear scan for response header collection. This eliminates red-black tree (_Rb_tree) and hash table template instantiations that are unnecessary for the small number of headers typically collected (1-5 elements). Changes: - response_headers_: std::map<string, list<string>> -> std::vector<Header> - collect_headers_: std::set<string> -> std::vector<string> - perform() signature: std::set -> std::vector - Add should_collect_header() inline helper for linear scan - Lowercase collect_headers at config/insertion time instead of per-request - IDF UserData now holds references to container's vector instead of owning a separate map that gets moved after the request - Reuse existing Header struct instead of std::pair Reduces stack usage in perform() and eliminates STL container overhead on memory-constrained ESP devices.
