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send_headerhook to send the reply header to the client.
none. Initially set to
none. When switching to
headerhook, it calls the
send_headerhook and if there is data queed this is send as first chunk. Each subsequent write to the CGI stream emits a chunk. The implementation does not use the chunked stream filter defined by http_chunked_open/3. It shares most of the implementation though and CGI streams do support http_is_chunked/1, http_chunked_flush/2 and http_chunked_add_trailer/3.