demo, lwipopts.h: #define DYNAMIC_HTTP_HEADERS
enetLwip, lwipopts.h: #define DYNAMIC_HTTP_HEADERS
however, third_party, httpserver_raw_io, httpd_io.c uses:
#if LWIP_HTTPD_DYNAMIC_HEADERS
#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
so to use this option, I think one needs: #define LWIP_HTTPD_DYNAMIC_HEADERS 1
however, turning this on appears to have set my debug back a bit.
I know testing all of the possible permutations/combinations of switches isn't possible.
I do wonder if any testing was done with dynamic headers actually turned on or
if anyone has any experience with this?