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5a88bb6d8a
search_query_sources was copying the URL query string into a 513-byte stack buffer, then query_key_value added another 513-byte buffer for the extracted value — 1026 bytes simultaneously on the httpd thread's limited stack, causing a crash in lwip_select. The query string already lives in req->uri after the '?'. Access it directly via pointer instead of copying, eliminating one buffer entirely.
