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1. In httpd_req_async_handler_begin, the httpd_req_aux is locally malloced and data is done memcpy to local httpd_req_aux from request'ss httpd_req_aux for async request use-case, this causes scartch pointer from these two structs pointing to same memory address. 2. In current workflow, the request's sratch buffer is freed in httpd_parse.c httpd_req_cleanup api. Therefore if the user try to fetch the data (like headers) from the scratch buffer, data will be not available. 3. Each request should have the deep copy of the scratch buffer. To retrive the data later. Closes https://github.com/espressif/esp-idf/issues/15587